Our garage is east-facing and over 1,000 sq ft. We installed a mini split (from Munns) about 4 years ago and did not add any insulation to the storage/attic area above it. However, our garage door is insulated. It is absolutely amazing how quickly that mini split can cool down the garage (and keep it cool) - even during the hottest days. It only takes about 10 minutes before the temperature reaches the selected level. In addition to storing 3 cars and 2 golf carts, we have a small workshop in one corner, a workout area (treadmill, Peloton bike, dual-rack functional trainer [cable machine], free weights] in another corner and a golf simulator/launch monitor with 10x15 foot movie/TV screen across the back. Whenever we want to use any of those or just work on our vehicles, we simple turn the mini split on and wait 10 minutes. Once it is cooled, doing anything in the garage is completely comfortable. We do not cool it all the time - only for extended use activities as noted above.
Last edited by GymJim; 08-27-2025 at 06:22 AM.
Reason: By the way - the cost for our mini split 4 years ago was about $5,000 (with 10% Dept. of Defense/Military discount).
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