You've got a nice 24x24 garage you want to cool and heat. Considering purchasing a mini-split system seems like the perfect solution for a space that size, but you're wondering what tonnage to get. Is a 12,000 BTU unit enough, or do you need to go bigger? Well, hold on, because the size you need depends on more than just the square footage. The good news is that it's not too hard to figure out once you know the main factors. Here at The Trade Table, we'll walk through how to calculate the right mini-split size for your 24x24 garage so you get a system that's just right.
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How to Calculate the Right Mini Split Size for a Garage
Size of the Garage
The first thing you need to consider is the square footage of your garage. A 24x24 garage is 576 square feet, so you'll want a unit rated for at least that size or larger. It's always better to oversize a mini split rather than undersize it.
Insulation and Air Sealing
How well is your garage insulated? If it's not insulated at all, you'll need a more powerful unit to handle the extra load. It's a good idea to add insulation and weatherstripping to improve the efficiency before installing a mini split.
Location of the Garage
The climate you live in also plays a role. If you have cold winters or very hot summers, you'll need a mini split with a higher BTU rating to maintain a comfortable temperature. For a typical detached garage, you'll want at least 18,000 to 30,000 BTU for heating and cooling.
Usage of the Garage
How you use your garage impacts the size as well. If you just park cars in it, you can get by with a smaller unit. But if you use your garage as a workshop or living space, you'll need additional BTUs for heating/cooling and ventilation. For a garage workshop, aim for at least 24,000 BTU.
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Recommended BTU Output for a 24x24 Garage
Size Matters
When it comes to cooling a 24x24 garage, size does matter. You'll want a unit with enough BTU power to effectively cool the entire space. For a garage of this size, look for a mini split with at least 18,000 BTU. Anything less won't have the muscle to overcome a hot summer day.
Consider the Climate
The climate in your area also plays a role in choosing the right BTU level. If you live in a typically hot region, you'll want a more powerful unit, maybe 24,000 BTU or higher. Colder climates can get by with slightly less, around 20,000 BTU. The most important thing is to choose a mini-split with enough capacity for the hottest days of the year.
Think About Insulation
Well-insulated garages are easier to cool and can work with lower BTU units. Poorly insulated spaces require more power to maintain a comfortable temperature. If your 24x24 garage isn't well insulated, you'll want a mini split on the higher end of the BTU scale, 24,000 or more. Adding insulation can help improve efficiency and reduce your cooling costs.
Other Considerations
The placement of the air handler can also impact the BTU needs. Corner units typically require more power while ceiling cassettes and wall units can work with slightly less. Consider how and where you plan to install the mini split to determine the right size for maximum efficiency and comfort.
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Features to Look for in a Garage Mini Split
When shopping for a mini split system for your garage, there are a few key features to consider. The capacity, heating and cooling abilities and installation requirements should guide your choice.
Sufficient Capacity
For a typical 24x24 garage, you’ll want a unit with at least 18,000 to 24,000 BTU of cooling power and 20,000 to 30,000 BTU of heating power. The capacity refers to how quickly and efficiently the unit can heat or cool the space. An undersized unit won’t be able to maintain a comfortable temperature, while an oversized unit is inefficient and can shorten the unit's lifespan. Check the specifications for the exact BTU rating to ensure it’s suited for your garage size.
Heating and Cooling
Unless you live in a temperate climate, you'll want a unit that can both heat and cool. Look for a model advertised as a "mini split heat pump" that can provide heating in winter and cooling in summer. These units are convenient since you won’t need a separate heating system for your garage. They can typically heat even when outdoor temperatures drop below freezing.
DIY-Friendly Installation
Many mini splits come pre-charged with refrigerant and only require a few holes to be cut in walls for the lines to pass through. Look for a model that is designed for DIY installation if you want to save on installation fees. The units will include detailed instructions for mounting the indoor and outdoor components and connecting the refrigerant lines. As long as you have basic skills, installation is often straightforward. However, if you're not comfortable doing it yourself, professional HVAC technicians can properly install the mini split for you.
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Top Mini Split Brands and Models for Garage Use
Mitsubishi (MUZ/MSZ)
The Mitsubishi MUZ/MSZ mini split lines are very popular for garage use because of their durability and energy efficiency. The MUZ units are compact, wall-mounted systems well-suited for small garages. The MSZ units are a bit more powerful and can heat/cool larger spaces. Mitsubishi is one of the pioneers of mini-split technology, so their units are innovative, reliable, and backed by solid warranties.
Daikin
Daikin is another reputable brand that produces high-quality mini splits for garages. Their Emura line offers affordable, compact wall units for spaces under 600 square feet. The FTQ outdoor units are more powerful and suited for larger garages, with options that can heat/cool up to 1,500 square feet. Daikin mini splits are known for being whisper-quiet, energy efficient, and low maintenance.
Pioneer
Pioneer mini splits provide a good value for DIY installations in garages. Their WYS/WYS+ wall-mounted models are compact, easy to install, and available in a range of sizes from 150 to 1,500 square feet. Pioneer mini splits may not have quite the longevity or warranty of Mitsubishi or Daikin, but they perform well for basic heating and cooling needs. They strike a good balance of affordability and functionality for garage use.
Fujitsu
Fujitsu mini splits are a highly efficient, eco-friendly option for garages. Their wall units like the ASU7RLF and AOU7RLF lines use R32 refrigerant, which has a lower global warming potential than standard refrigerants. These units are very quiet, provide even temperature distribution, and are available in a range of sizes for garages 200 to 1,500 square feet. Fujitsu mini splits may cost slightly more upfront but can save significantly on energy costs over time.
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$1,968.77
$2,419.99
Buck Cool Mini-Split EZ Connect 12K BTU Complete Installation Kit The Buck Cool Mini-Split EZ Connect Complete Kits are designed to offer a simple solution for your heating and cooling needs. The pre-charged EZ Connect line sets allow for a… read more
What Mini Split Size Is Best for a 24x24 Garage
So there you have it - the best mini split size for a 24x24 garage comes down to how you plan to use the space. If it's just for parking cars or basic storage, a 12k BTU unit should do the trick. But if you want to turn it into a hangout zone or workshop, go for 18-24k BTU to handle the extra bodies and equipment. And don't skimp on getting a pro install - the location of the air handler and the efficiency of the system matter. With the right mini-split matched to your needs, you'll be chilling in comfort no matter what you're using your 24x24 garage for.
