The battle over the thermostat is a classic household drama. One person is always too hot, while another is reaching for a blanket. A mini-split system puts an end to that conflict by introducing “zoning” to your home. With a multi-zone setup, you can set different temperatures for different rooms, all running off a single outdoor unit. This means the living room can be cool and comfortable while a home office stays a bit warmer. It’s customized comfort that meets everyone’s needs. Here, we’ll explore how this technology works and what to expect from a mini split ac installation.
Key Takeaways
- Target Your Comfort and Lower Your Bills: Mini-splits deliver heating and cooling directly into specific rooms without ducts, giving you precise control over different zones and preventing the energy waste common in central air systems.
- Leave Installation to the Experts: A mini-split’s performance hinges on correct sizing, safe electrical work, and precise refrigerant line handling. Hiring a certified professional is the only way to guarantee your system runs safely and efficiently.
- Protect Your System with Simple Maintenance: Keep your mini-split in top shape by cleaning the reusable filters monthly and scheduling an annual professional tune-up to handle the technical checks, ensuring longevity and performance.
What Is a Mini-Split AC, and How Does It Work?
If you’ve ever struggled with a room that’s always too hot or too cold, you’ve probably wished for a more targeted solution than your central thermostat. That’s exactly where a mini-split AC system comes in. Think of it as a flexible, high-efficiency climate control system for specific areas of your home or business. Unlike traditional HVAC systems that rely on a network of ducts to push air around, mini-splits deliver heating and cooling directly where you need it, giving you precise control over your environment.
A mini-split is a special type of heat pump, which means it’s an all-in-one powerhouse that can both cool your space in the summer and warm it up in the winter. This two-in-one capability makes it an incredibly efficient and popular choice for home additions, garages, older homes without existing ductwork, or even just for supplementing your current system in a problem area. The core idea is simple: provide powerful, zoned comfort without the complex and invasive installation of traditional ductwork. It’s a modern approach to residential heating and cooling that puts you in control of your comfort, room by room.
The Key Components
A mini-split system is elegantly simple and consists of two main parts. First, there’s an outdoor compressor/condenser unit. This is the engine of the system, and it sits outside your home, much like a traditional central air conditioner unit. Second, you have one or more slim, wall-mounted indoor units. These are the sleek air handlers installed directly in the rooms you want to heat or cool.
The two components are connected by a small conduit that runs through a three-inch hole in the wall. This bundle contains the refrigerant lines, electrical wiring, and a condensate drain line. That’s it—no bulky metal ducts required.
How They Deliver Duct-Free Comfort
The term “ductless” is the magic behind the mini-split. Because they don’t need ductwork, there’s no need to tear open your walls or ceilings for a messy, complicated installation. This makes them a fantastic option for existing homes, especially those with historic architecture or layouts where adding ducts would be impractical or impossible.
Instead of losing precious conditioned air through leaky ducts, a mini-split delivers it straight from the indoor unit into the room. This direct approach is not only less invasive to install but also highly efficient. It gives you the flexibility to create custom comfort zones throughout your home, ensuring every space feels just right.
Why Choose a Mini-Split AC System?
If you’re looking for a flexible and efficient way to manage the temperature in your home or business, a mini-split system is an excellent choice. Unlike traditional central air systems that rely on a network of ducts to distribute air, mini-splits deliver heating and cooling directly to specific rooms or zones. This design makes them perfect for a wide range of applications, from conditioning a new home addition or a converted garage to providing targeted comfort for specific areas in a commercial building.
The real appeal of mini-splits lies in their combination of power, efficiency, and convenience. They offer a modern solution that adapts to your specific needs, whether you’re cooling a single stuffy bedroom or setting up a complex multi-zone system for an entire office. For many property owners, they represent a smart upgrade from clunky window units and inefficient space heaters. As a leader in residential HVAC solutions, we’ve seen firsthand how these systems can transform a space, providing consistent comfort without the drawbacks of older technology. Let’s look at some of the key reasons why a mini-split might be the perfect fit for you.
Save Energy and Money
One of the biggest draws of a mini-split system is its incredible energy efficiency. Because they don’t use ducts, you avoid the energy loss—up to 30%—that typically happens in central forced-air systems. Mini-splits are a much more efficient way to heat and cool a space compared to relying on separate old AC units and space heaters. This efficiency translates directly into lower utility bills each month. By delivering conditioned air right where you need it, you aren’t paying to cool or heat unused rooms. Keeping up with regular filter cleaning and professional check-ups through service maintenance programs will ensure your system continues to operate at peak efficiency for years to come.
Customize Your Comfort with Zoning
Mini-split systems give you the power to create different temperature “zones” throughout your property. A single outdoor compressor can connect to multiple indoor air handlers, each with its own thermostat. This means you can keep the living room cool and comfortable while setting a warmer temperature in a chilly home office. This level of control is a game-changer for both homes and businesses, ending the thermostat wars for good. For our commercial clients, zoning is especially valuable for conference rooms, server rooms, and individual offices, allowing for customized comfort that meets everyone’s needs without wasting energy on unoccupied areas.
Enjoy Year-Round Heating and Cooling
Don’t let the “AC” in the name fool you—mini-splits are powerful heaters, too. These systems are actually heat pumps, which means they can efficiently pull heat from the outside air to warm your home in the winter. Even on a cold North Carolina day, a modern mini-split can provide consistent, comfortable heat. This dual functionality makes them an all-in-one solution for year-round comfort, simplifying your home’s mechanical systems. If you’re thinking about replacing an older furnace or AC, you can schedule a virtual Tele-Tech appointment to see how a mini-split could handle both jobs with one efficient unit.
Breathe Easier with Quiet Operation
If you’re tired of the loud roar of a window AC unit or the constant hum of a central air system kicking on and off, you’ll love the peace and quiet of a mini-split. The components that make the most noise, like the compressor and condenser, are located in the outdoor unit. The indoor air handler operates so quietly you’ll barely notice it’s running—often producing sound levels as low as a whisper. This makes them an ideal choice for bedrooms, nurseries, libraries, and any other space where a quiet environment is a top priority. It’s one of the most appreciated features for homeowners looking to improve their home comfort.
What to Consider Before Installation
Jumping into a mini-split installation without a little prep work is like starting a road trip without a map. A bit of planning ensures you get a system that fits your home, works efficiently, and keeps you comfortable for years to come. Before you schedule an installation, it’s important to think through a few key factors, from the size of the unit to the specific needs of your home’s structure and electrical system. Getting these details right from the start will save you headaches and money down the road, guaranteeing your new system is a perfect match for your space.
Sizing Your System Correctly
When it comes to mini-splits, bigger isn’t always better. An oversized unit will cool the room too quickly without removing humidity, leaving you with a cold, clammy feeling. A system that’s too small will run constantly without ever reaching the set temperature. A good starting point is to calculate about 35 BTUs (British Thermal Units) per square foot of the space you want to condition. However, factors like ceiling height, window quality, and insulation levels also play a huge role. A professional load calculation is the only way to be certain you’re getting the right size for your specific room.
Is It Right for North Carolina’s Climate?
North Carolina weather can be a rollercoaster, with hot, humid summers and winters that bring a definite chill. Mini-splits are an excellent match for this climate because they are heat pumps, meaning they provide both heating and cooling. They offer a much more efficient way to manage your home’s temperature compared to relying on old window AC units and space heaters. Because they can handle both extremes, a mini-split system provides a streamlined, year-round solution for residential heating and cooling, keeping you comfortable no matter what the forecast says.
Your Home’s Electrical Setup
A mini-split isn’t a simple plug-and-play appliance. The outdoor condenser unit is a powerful piece of equipment that needs its own special 240-volt electrical circuit. This means you can’t just plug it into a standard wall outlet. A licensed electrician or a qualified HVAC technician will need to run a new, dedicated line from your home’s main electrical panel to the outdoor unit. This is a critical step for safe, reliable operation, so it’s essential to factor this electrical work into your installation plan from the very beginning.
Structural and Wall Requirements
The placement of the indoor unit, or head, is just as important as its size. It needs enough clearance on all sides to properly circulate air throughout the room, which is why it’s often placed high on a wall, frequently above a window or door. The wall itself must be strong enough to support the unit’s weight. During installation, the technician will secure a mounting plate directly to the wall, sometimes needing to adjust its position to avoid wall studs for a secure fit. Thinking about placement ahead of time can help you visualize the final look and ensure optimal airflow. If you’re unsure about the best spot, a virtual Tele-Tech appointment can be a great way to get expert advice.
How Much Does Mini-Split Installation Cost?
When you start looking into mini-split systems, one of the first questions you’ll have is about the price. The total cost for a mini-split installation can range anywhere from $2,000 to over $10,500, depending on the complexity of the job and the type of system you choose. It’s a wide range because the final price tag is more than just the cost of the unit itself. It’s a combination of the equipment, the labor required for a proper installation, any necessary electrical work, and a few other variables that are unique to your home or commercial space.
Think of it like this: buying the mini-split unit is just the first step. The real value comes from a professional installation that ensures your system runs efficiently and safely for years to come. A qualified technician doesn’t just hang the units on the wall; they perform precise calculations, handle delicate refrigerant lines, and ensure every electrical connection is secure. This expertise prevents future headaches like refrigerant leaks, poor performance, or even system failure. To give you a clearer picture of what to expect, let’s break down the costs you’ll likely see on your estimate. Understanding where your money is going will help you make a confident decision for your property.
Breaking Down Equipment Costs
It’s easy to get sticker shock when you see an installation quote that’s much higher than the price of the mini-split unit you saw online. For example, a single indoor unit might cost between $900 and $1,200, but the total installed price could be closer to $3,900 to $4,600. This difference is because the equipment cost is only one piece of the puzzle. The final price includes the expertise, tools, and time needed to get your system running perfectly. When you partner with a professional, you’re not just buying a box; you’re investing in a complete residential HVAC solution tailored to your space.
Understanding Labor and Installation Fees
Labor is a significant part of the total installation cost, and for good reason. A proper mini-split installation is a detailed process that requires skill and precision. Installing the outdoor condenser and the first indoor unit can take a technician around 14 hours. If you’re installing a multi-zone system, you can add another 8 to 9 hours for each additional indoor unit. With professional labor rates often around $135 per hour, you can see how the time adds up. This investment covers the technician’s expertise in handling refrigerant, ensuring proper connections, and testing the system to guarantee it works as it should from day one.
Factoring in Permits and Electrical Work
Mini-split systems have specific electrical needs that your current setup might not meet. They require a dedicated 240-volt circuit, which usually means hiring a licensed electrician to run a new line from your electrical panel to the outdoor unit. This electrical work is crucial for safety and proper operation. The cost can range from $550 if the unit is close to the panel to $850 or more if the wiring needs to cover a longer distance. Depending on your local regulations, you may also need to secure a permit for the installation, which adds another layer to the overall project cost.
What Can Make Installation More Expensive?
Beyond the standard equipment and labor, several factors can increase the final cost of your mini-split installation. For instance, if the best spot for your outdoor unit is on the roof, a crane might be needed to lift it into place, which could add around $425 to the bill. Other variables include the number of indoor units you need, the system’s energy efficiency rating (SEER), and the length of the refrigerant lines connecting the indoor and outdoor components. To get a precise idea of your costs, you can schedule a Virtual Tele-Tech appointment to have your space evaluated and discuss the best options for your budget.
DIY vs. Professional Installation: What’s the Right Choice?
When it comes to installing a mini-split, the temptation to go the DIY route is understandable. You see a kit online, watch a few videos, and think, “How hard can it be?” While that can-do spirit is great for many home projects, installing a mini-split system is a different beast. It involves electrical wiring, refrigerant lines, and precise placement—all of which have a major impact on your system’s performance and safety. Let’s break down why bringing in a professional is almost always the right call.
The Case for Hiring a Pro
Hiring a licensed professional is about more than just convenience; it’s about getting the job done right the first time. A certified HVAC technician has the training, specialized tools, and experience to handle the complexities of a mini-split installation. They understand local building codes, electrical requirements, and the precise science of refrigeration. A pro ensures every component, from the indoor air handler to the outdoor condenser, is installed for optimal efficiency and longevity. This expertise is crucial for avoiding common mistakes that can lead to poor performance or even system failure down the road. For a seamless and correct setup, you need a team that specializes in residential heating and cooling.
The Risks of a DIY Installation
Attempting a DIY installation can turn a money-saving project into a costly headache. One of the most common mistakes is incorrect placement of the indoor unit, which can lead to inefficient cooling and uneven temperatures. Even more serious are the technical risks. Handling refrigerant lines without proper training can cause leaks, which are not only harmful to the environment but also damage the system’s compressor. An improperly mounted unit can damage your walls, and faulty electrical wiring is a significant safety hazard. These aren’t just minor hiccups; they are serious issues that often require an expensive professional call-out to fix anyway.
Why a Certified Contractor Matters
A certified contractor provides a level of quality and assurance that a DIY project simply can’t match. Professionals perform essential steps that are often skipped in DIY attempts, like conducting a pressure test with nitrogen to guarantee there are no tiny leaks in the refrigerant lines. This single step is critical for the long-term health of your system. While the upfront cost of a professional installation might seem high, it reflects the skilled labor, specialized equipment, and peace of mind that comes with it. Think of it as an investment in your home’s comfort and safety. A proper installation by a trusted team protects your new equipment and prevents the need for future repairs caused by installation errors.
How to Choose the Right Mini-Split System
Once you’ve decided a mini-split is the right fit for your home, the next step is picking the perfect system. This isn’t just about choosing a brand; it’s about matching the unit’s capacity and features to your specific needs. Getting this part right is the key to unlocking all those energy-saving and comfort benefits you’re looking for. Think of it like finding the right pair of shoes—what works for one person might not work for another. We’ll walk through the three main things to consider: the number of rooms you need to cover, the size of the system, and the efficiency ratings that will impact your energy bills for years to come. Making a smart choice here ensures your new system will be a long-term asset, not a source of frustration.
Single-Zone vs. Multi-Zone: Which Do You Need?
First, decide how many areas you want to heat and cool. If you’re focused on a single space—like a new home addition, a converted garage, or a sunroom that’s always too hot or cold—a single-zone system is your answer. It consists of one outdoor compressor connected to one indoor air handler. It’s a straightforward and effective solution for targeted comfort.
If your goal is to manage the climate in several different rooms, you’ll want to look at multi-zone systems. These setups use one powerful outdoor unit to run multiple indoor units (typically two to five). This allows you to create independent temperature zones throughout your home. Keep in mind that multi-zone systems cost more upfront because you’re buying extra indoor units and the installation is more complex.
Getting the Sizing and Load Calculation Right
When it comes to HVAC, bigger is definitely not better. An oversized mini-split will cool the room too quickly without properly dehumidifying the air, leading to a cold, clammy feeling. An undersized unit will constantly struggle to keep up, running inefficiently and driving up your energy bills. The key is finding the size that’s just right.
A general rule of thumb is to plan for about 35 BTUs (British Thermal Units) per square foot of space. However, this is just a starting point. A true professional load calculation considers much more, including your ceiling height, insulation quality, window placement, and local climate. This detailed analysis is the only way to guarantee your system is perfectly sized for peak performance and efficiency. You can always get an expert opinion to ensure you make the right investment.
Key Features and Efficiency Ratings to Look For
As you compare models, you’ll see a lot of acronyms—SEER2, EER2, and HSPF2. These are simply ratings that tell you how energy-efficient a unit is. A higher rating means the system uses less energy to do its job. While units with better efficiency ratings often have a higher initial cost, they can save you a significant amount of money on utility bills over the life of the system.
Beyond efficiency, look for features that fit your lifestyle. Many modern mini-splits come with smart controls that let you adjust the temperature from your phone, whisper-quiet operation, and advanced filtration systems for cleaner air. Our team can help you explore all the options available for your residential heating and cooling needs to find a system with the perfect blend of performance and features.
What to Expect During Installation
Once you’ve chosen the right mini-split, the installation is a clear, step-by-step process. With a certified team, you can feel confident every detail is handled correctly. We manage the technical work so you can focus on enjoying your new, efficient comfort system. Here’s a look at what happens on installation day.
Step 1: Planning and Site Prep
Before installation, our first step is to confirm the plan. We verify the mini-split is correctly sized for the room’s square footage to ensure it runs efficiently. Our licensed professionals then map out the best locations for the units, planning the most discreet route for the connecting lines. This careful site prep is the foundation of a smooth installation and helps prevent common issues.
Step 2: Mounting the Indoor and Outdoor Units
Next, we mount the indoor and outdoor units. The indoor air handler is typically placed high on an interior wall, often above a window, where it can effectively circulate air. For the outdoor condenser, we find a stable spot and mount it about two feet off the ground. This elevation protects it from moisture and debris, ensuring proper airflow for efficient operation. Secure mounting is key to quiet, vibration-free performance.
Step 3: Connecting Lines and Electrical Wiring
This step requires technical expertise. We drill a small hole through an exterior wall for a conduit containing the refrigerant lines, electrical wiring, and drain line. Your mini-split needs a dedicated 240-volt circuit, so our technicians run the proper wiring from your main electrical panel to a disconnect box near the outdoor unit. We handle all residential and commercial electrical work safely, ensuring your system has reliable power.
Step 4: Testing the System
The final step is to test the system thoroughly. Before adding refrigerant, we perform a pressure test with nitrogen gas to confirm there are no leaks. Once the system is verified as sealed, we charge it and turn it on. We test all functions—heating, cooling, and fan modes—to ensure everything is working perfectly. We won’t leave until we’re confident your new system is running at peak performance and you know how to operate it.
Common Installation Hurdles to Avoid
A successful mini-split installation is about more than just hanging units on the wall. A few key technical details can make the difference between an efficient, long-lasting system and one that causes headaches down the road. Getting these right is why having a seasoned professional on your side is so important. They’ve seen it all and know how to handle these common challenges before they become problems, ensuring your system runs perfectly from day one. Let’s walk through the three biggest hurdles you’ll want to be aware of.
Handling Electrical Upgrades
One of the first things to know is that a mini-split isn’t a plug-in appliance. It requires a dedicated 240-volt circuit to operate safely and effectively. If your home or building doesn’t already have the right wiring in place near the installation spot, you’ll need an electrical upgrade. This work must be done by a licensed electrician to meet safety codes. A professional HVAC installer will assess your current electrical panel and coordinate any necessary upgrades, making sure everything is handled correctly and safely. This step is non-negotiable for protecting your investment and your property.
Routing Refrigerant Lines Correctly
The indoor and outdoor units of your mini-split are connected by a set of refrigerant lines. These lines need to be routed carefully through a small hole in your wall. If this connection isn’t handled with precision, you can end up with refrigerant leaks, which are a primary cause of system failure and inefficient cooling. A professional ensures the lines are connected securely, charged with the exact amount of refrigerant needed, and that the hole is perfectly sealed to prevent drafts, moisture, or pests from getting in. Proper handling of these lines is crucial for any residential HVAC project.
Ensuring Proper Unit Placement for Airflow
Where you place your indoor unit matters—a lot. Sticking it in the wrong spot can lead to poor airflow, inefficient operation, and even shorten the system’s lifespan. You’ll want to avoid placing it in direct sunlight, near other heat sources, or in a location where furniture could block the airflow. The wall also needs to be strong enough to support the unit without vibrations. An experienced technician will evaluate your room’s layout to find the optimal location for even temperature distribution, ensuring your system doesn’t have to work overtime. This is just as critical for large commercial HVAC systems as it is for home installations.
How to Prepare Your Home for Installation Day
Getting ready for your new mini-split system is exciting! A little preparation on your part can help make installation day go as smoothly as possible for you and the technicians. By taking care of a few simple things ahead of time, you ensure the team can work efficiently and safely, getting your new system up and running without a hitch. Think of it as rolling out the welcome mat for your new comfort system. Here’s a quick checklist to help you get your home ready.
Clear the Space and Check for Support
Your installation team will need clear access to the areas where the indoor and outdoor units will be placed. Start by clearing a path from the entrance to the installation spots. Move any furniture, rugs, or decorations away from the interior wall where the unit will be mounted. Remember, the indoor unit needs plenty of open space to work correctly—it pulls air in from the top and sends conditioned air out from the bottom. Outside, make sure the area for the condenser is clear of any plants, patio furniture, or yard debris. This ensures our technicians have the room they need to install your residential HVAC system safely and securely.
Plan for Permits and Electrical Needs
A mini-split system is a significant electrical appliance, and it requires its own dedicated 240-volt circuit to operate safely. This isn’t a standard outlet, so the work must be done by a qualified electrician to meet local building codes. When you work with QRC, we coordinate all the necessary electrical work and secure any required permits for the installation. You won’t have to worry about juggling multiple contractors or figuring out the paperwork. We handle the technical details so you can focus on the comfort your new system will bring. Our goal is to make the entire process seamless and stress-free from start to finish.
Finalize Your Unit Locations
Before the technicians arrive, take a moment to review and confirm the planned locations for both the indoor and outdoor units. You’ve likely already discussed this with your consultant, but it’s always a good idea to do a final check. Make sure the indoor unit isn’t placed where airflow will be blocked by curtains or large furniture, and keep it away from direct sunlight or other heat sources. If you have any last-minute questions or want a final opinion on placement, you can always schedule one of our Virtual Tele-Tech appointments. Confirming these details beforehand helps prevent any delays and ensures your system is positioned for optimal performance.
Keeping Your New Mini-Split in Top Shape
Once your mini-split is installed, a little care goes a long way in keeping it running efficiently for years. Think of it like any other important appliance in your home—regular upkeep is the key to performance and longevity. The good news is that much of the basic maintenance is simple enough to handle on your own, while a professional can take care of the more technical tune-ups. By staying on top of a few key tasks, you’ll protect your investment, maintain your home’s comfort, and keep your energy bills in check.
Simple DIY Maintenance: Filters and Cleaning
One of the best things about mini-splits is how easy they are to maintain. Your main job is to keep the filters clean. Clogged filters restrict airflow, which makes the system work harder and can hurt your indoor air quality. Plan to check your filters monthly—you can usually just rinse them with water, let them dry, and pop them back in.
While you’re at it, give the indoor unit a quick wipe-down to prevent dust buildup. Don’t forget about the outdoor unit, either. Make sure it’s clear of any leaves, grass clippings, or other debris that could block airflow. These simple steps take just a few minutes but make a huge difference in your system’s efficiency.
When to Schedule a Professional Tune-Up
While you can handle the basics, it’s a good idea to have a professional inspect your mini-split system at least once a year. A trained technician can perform a deeper clean and check on the mechanical and electrical components that you can’t see. They’ll clean the condenser coils, check refrigerant levels, and ensure the drain lines are clear to prevent leaks and water damage.
Scheduling regular professional maintenance catches small issues before they become big, expensive problems. The easiest way to stay on track is by signing up for a service maintenance program, which ensures your system gets the expert attention it needs to run smoothly all year long.
Warning Signs That Your System Needs Repair
Even with great maintenance, problems can sometimes pop up. Keep an eye out for a few common warning signs that your mini-split needs professional help. If you notice it’s not cooling or heating as well as it used to, that’s a major red flag. Other signs include strange noises like grinding or rattling, water leaking from the indoor unit, or a sudden spike in your energy bills.
These issues can point to problems like a refrigerant leak or an electrical issue. If you notice any of them, it’s best to call for residential HVAC services right away to get things checked out. Acting quickly can prevent further damage and more costly repairs down the road.
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Frequently Asked Questions
Can a mini-split really heat my home in a North Carolina winter? Absolutely. The name can be a bit misleading, but mini-splits are powerful heat pumps designed for both cooling and heating. They work by efficiently pulling heat from the outside air and moving it inside your home. Modern systems are built to handle our chilly winters, providing consistent and comfortable warmth, which makes them a great all-in-one solution for year-round comfort.
Why is professional installation so important if I can buy a kit online? While DIY kits seem tempting, installing a mini-split involves complex electrical wiring and handling high-pressure refrigerant lines. A small mistake, like an improperly sealed line or faulty wiring, can cause major damage, lead to poor performance, or create a safety risk. A certified professional ensures the unit is sized correctly for your space, placed for optimal airflow, and all connections are secure, which protects your investment and ensures the system runs efficiently from day one.
How much maintenance does a mini-split actually need? The routine upkeep is quite simple. Your main job is to clean the reusable filters about once a month, which usually just requires a quick rinse with water. You’ll also want to keep the outdoor unit clear of any leaves, grass, or debris. Beyond that, scheduling a professional tune-up once a year is a smart move. A technician can perform a deeper clean and check the mechanical components to keep your system running at its best.
Can I use a mini-split system for my whole house? Yes, you certainly can. While a single-zone system is designed for one specific room or area, a multi-zone system connects several indoor units to a single outdoor compressor. This setup allows you to create independent temperature zones in different rooms, giving you customized comfort throughout your entire home without the need for traditional ductwork.
What’s the most important factor when choosing a mini-split? The single most critical factor is getting the size right. A system that’s too large will cool the room too quickly without removing humidity, leaving the air feeling clammy. A system that’s too small will run constantly and struggle to keep you comfortable. A professional load calculation is the only way to ensure you get the perfect size, as it considers your room’s square footage, ceiling height, insulation, and window placement.