Posts: 292
Joined: Fri Jul 27, 2012 7:35 am
Location: Winter Garden, FL

Attached Garage Air Conditioner

Tue Aug 07, 2018 11:18 am

Having moved to central Florida two years ago, we found out how hot our attached garage gets in the summer. Going through the door from the house into the garage is like walking into an oven, and the interiors of our vehicles we keep in the garage are also like ovens. After recently purchasing two Chevy Bolts, I decided to install an air conditioner for the garage. I researched three choices: a wall unit, a portable air conditioner, and a ductless split system. I installed a MRCOOL DIY ductless mini-split system 12,000 BTU heat pump. The installation is do-it-yourself because the line set comes pre-charged. I have the temperature set to 79º F. Total installation parts cost was around $1,500.00. The unit is extremely energy efficient, 17.5 SEER in summer, and super quiet.

Cooling the garage should help prolong our EV's battery life, and now I can actually work in the garage in the summer. The air conditioner is sized properly to run long enough to remove the humidity which is usually high in Florida, and the air conditioner has no problem keeping the garage cool, even on the hottest days. When we get into any of our three EV's in the garage the passenger cabins are a comfortable 78º F so that we don't have to use our battery charge to remove the heat from the interior of the vehicles. Also, since our attached garage shares a wall with a bathroom, and shares a ceiling with the floor of an upstairs multi-purpose room, keeping the garage cool will result in our house air conditioning having to work less.

The attached photos show the outdoor condenser, the indoor air handler, our energy efficient heat pump water heater (that removes heat from the garage to make hot water - works well in Florida where winters are mild), and the insulation I used for the garage doors.

”Blue” - 2018 Kinetic Blue Chevy Bolt Premier with QC - 5/13/18
“Red” - 2017 Cajun Red Chevy Bolt LT with QC - 3/30/2018
"Purple" - 2012 Raspberry Metallic ES with QC - 4/10/2013

Site Moderator
Posts: 2704
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: Attached Garage Air Conditioner

Tue Aug 07, 2018 11:56 am

Very nice installation and a great upgrade. Is the mini-split 120 or 240?

I've been meaning to insulate my garage doors, but so far . . . . .

I did install an 18,000 btu 240 volt window unit mounted in the back wall of our garage 3 or 4 years ago, but I only use it when I'm working out there. The rest of the time, I have an L2 EVSE plugged into it's outlet. Our garage has a double roof with about 3 feet of air space between the roofs, so it doesn't get nearly as hot in there as the outside ambient temps

I both admire and despise (because I can't seem to do it) anyone who can keep a garage as neat as yours - Mine is on the other end of the scale! :lol:

2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

Site Moderator
Posts: 3513
Joined: Thu Dec 15, 2011 5:47 am
Location: Los Altos Hills, California

Re: Attached Garage Air Conditioner

Tue Aug 07, 2018 2:43 pm

RobertC, thank you for posting. Someone I know in California's central valley is buying an EV and their garage regularly sits at >100°F and the mini-split has been on my mind to do exactly what you did. Insulating the large garage doors is a nice touch! Agree with Don, a garage that 'clean' is alien ... is that a heat-pump water heater in the background (that also acts as an aircon)?
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

Posts: 138
Joined: Mon Jul 27, 2015 9:22 pm
Location: Castro Valley, CA

Re: Attached Garage Air Conditioner

Wed Aug 08, 2018 9:48 am

Looks clean and professionally installed. The only thing I notice is the extra coiled up line set behind the compressor but that's okay. The system was pre-charged for that amount of copper anyway. What kind of connectors do they use for the line set?

Nice work! Thanks for showing us.
2012 ES, Cool Metalic Silver, no quick charge, no fog lights and no navi but a cold weather package for when it gets 13 below, wait - it never gets that cold here.
"Silver Shadow"

Return to “Batteries and Battery Management”