Unbearable Heat and Humidity

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Forum topic by Rhino690 posted 06-20-2018 01:51 PM 3613 views 0 times favorited 44 replies Add to Favorites Watch
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11 posts in 1474 days

06-20-2018 01:51 PM

Topic tags/keywords: question


I live in Florida and as can be imagined, it’s hot and humid – just like many other areas around the country and beyond. However, not everyone has a workshop in their garage. My question is this; has anyone on this forum tried to divide off a portion of their garage/workshop with perhaps some heavy-duty plastic (visquine???) and then installed a window AC? If so, what did you use for the partition and how well did it work?

I love to make/fix things but as I get older it is becomming harder and harder to even go into the garage, let alone work in it. So I end up with 1-2 hours at the beginning and end of the day to work inside my shop.

Any thoughts/Ideas?

Thank you for taking the time to help an old man continue to work in his garage and enjoy the finer things in life which is helping others.


44 replies so far

View sawdustdad's profile


379 posts in 1693 days

#1 posted 06-20-2018 03:03 PM

A window A/C will do wonders to make your work area more comfortable. Go for it.

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

View John Smith's profile

John Smith

2518 posts in 971 days

#2 posted 06-20-2018 03:58 PM

yep – better than dripping sweat into your freshly applied finish !!
do it !!!

Hailing from Kissimmee !!



-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

View ColonelTravis's profile


1976 posts in 2702 days

#3 posted 06-20-2018 04:31 PM

I’m in Texas, no window in my garage. If I had one, there would be AC in there immediately. Guy next door to me cut open his brick wall and put one in there, and now the bricks are falling apart and the AC is drooping. Should have hired a pro.

Anyway – DO IT! I wouldn’t worry about dividing it up in plastic.

View JRsgarage's profile


389 posts in 1317 days

#4 posted 06-20-2018 04:39 PM

Same boat with the heat situation. No window in garage and even if it did, HOA would not allow a window unit. I’ve been thinking about insulating the garage doors and looking a Portacool units. ...just not sure what an evaporative cooler will do the tools and wood. Ideally, a mini split would be perfect

-- “Facts don't care about your feelings.” ..., Ben Shapiro

View dschlic1's profile


474 posts in 2778 days

#5 posted 06-20-2018 04:42 PM

I also hail from Florida. I believe Jay Bates lives in Mississippi installed AC in his garage work shop. No one that I know of has separated the garage in two.

View clin's profile


1114 posts in 1804 days

#6 posted 06-20-2018 06:11 PM

I separated mine with a full, insulated permanent wall. So shop is a completely separate room now (shop is 1 of 3 garage bays). But anything, such as plastic, is better than nothing. I think it would help a lot. Window units are cheap and no reason not to give it a go. I put in a mini-split and now my shop is every bit as temperature controlled as any room in the house. Actually better than most of my house.

I have a friend who installed one of those inexpensive stand alone units that is not a closed system. So is not that efficient. He has a very small shop area off his garage. Actually vents the heat from the AC into his garage and the return air slips by the plastic he has as an opening. It’d be better to vent outside, but that was not an option for him. It works really well for him. But his shop space is very small <100>d give the window AC unit a go, again because it is cheap and it may work well for you. If not, you can look at something better like a mini-split. My guess is the window AC may work just fine. It will be noisier, and more expensive to operate. But how much it affects your electric bill will depend a lot on how much you use it.

-- Clin

View Rayne's profile


1314 posts in 2348 days

#7 posted 06-20-2018 06:13 PM

I’m in central FL and would recommend a mini-split. Well worth the investment, IMO. My electric bill barely increased with the new system and it’s a super comfortable 79 degrees in there. Love it. My HOA had no problems with the mini-spilt either; I also insulated the attic and the garage door.

View MrRon's profile


5925 posts in 4052 days

#8 posted 06-20-2018 07:17 PM

I live in South Mississippi and live with high heat and humidity. My shop is 1200 sq ft and although it gets pretty hot, a 36” fan manages to keep it from being intolerable. As long as you can maintain a breeze, the evaporative process does it’s work and keeps you relatively cool. I also have a smaller room within the shop that has A/C because there is where I do machining. Sweat doesn’t mix with precision machine surfaces and precision measurement tools.

View OSU55's profile


2651 posts in 2798 days

#9 posted 06-20-2018 08:06 PM

Window units work well. Im in MO, not FL etc, but it still gets into the mid and upper 90’s with 50% and higher humidity. I have a 12k 110V unit that keeps the large 24×28 2 car garage very nice. I use a WIN 100 tstat with an integrated 110V 15A contactor, $40 on Amazon, that the unit plugs into and a short ext cord from the tstat to wall outlet. I use a hi velocity blower fan, like a carpet dryer, a Kobalt from Lowes, to circulate air.

My garage goor is insulated and there is substantial insulation blown in the ceiling. I also leave it on 24×7 once the heat starts – if I dont it takes all night to pull down. A small 110V ceramic heater keeps it plenty warm in the winter.

If a window unit cant be used, a split system, there are many types, will work well, just a lot more expensive than a window unit. Stay away from the “portable” units that use flex ducts for outside condenser air – they cant move enough air

Evap cooling units only work in very low humidity areas with a max of ~ 95F, ie hi desert, where it cools down at night.

View sawdustdad's profile


379 posts in 1693 days

#10 posted 06-20-2018 09:00 PM

A 12k BTU unit will cool an average (insulated) 2 car garage easily.

I have a 1.5 ton heat pump in my 28×46 super insulated workshop. Maintains 72 deg. when it’s 95 to 100 outside. Here it is just after installation, during construction. Actually had a pair of 6k BTU window units in it while working on the heat pump install. The 2 small A/C units actually cooled the entire shop quite well.

If you garage is attached to the house, you might only need a 6k to 8k unit. I have a 6k BTU unit in my attached two car garage and it cools it quite well.

One other consideration, beyond making working conditions tolerable, is the dehumidification helps prevent tool rusting and keeps kiln dried lumber from absorbing too much moisture.

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

View Richard Lee's profile

Richard Lee

299 posts in 1583 days

#11 posted 06-20-2018 10:35 PM

Move to Canada , soon enough it will be 40 below.
Its 30c or 83f here and I find it way to hot. I cant imagine how hot and humid it is down south.
Put the shaker in and enjoy.

View Rhino690's profile


11 posts in 1474 days

#12 posted 06-21-2018 12:11 AM

Thanks for all your input. I think I’ll try a window unit first. However, the HOA folks are not nice people so I will have to let the hedge in front of the window grow a bit taller. (LOL). And I would move to Canada in a moments notice if I could get the wife to agree. Again, thanks for the advice.

View woodbutcherbynight's profile


6069 posts in 3217 days

#13 posted 06-21-2018 02:55 AM

Window A/c unit or split system would work well.

How hot would you say it is?

-- Live to tell the stories, they sound better that way.

View Lazyman's profile


5673 posts in 2195 days

#14 posted 06-21-2018 03:25 AM

I have one of those portable A/C units designed to vent out a window with hoses. My garage has no windows so I bought 2 ports for the garage door designed for mechanics to vent car exhaust so I can vent the A/C through the door. It makes my garage bearable in the Texas heat and humidity. It also has a heat pump which makes it bearable on the coldest days in the winter too. A window unit will be cheaper and more efficient but if you don’t have a window the exhaust ports work very well with the portable units. I’d would make sure it is at least 12,000 BTU for a 2 car garage.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View mel52's profile


1527 posts in 1073 days

#15 posted 06-21-2018 04:55 AM

I have a friend that has a set-up like Lazyman just mentioned and it does a pretty good job for him. He has a cat door in the wall by his entrance and he modified an adapter to use it for the exhaust when he needs it. ( Bet it was a surprise for the cat the first time he tried to use it. ) LOL

-- MEL, Kansas

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