Any cheap / free ideas to cool a garage?

Then how do you explain wind chill?
Windchill refers only to the rate of heat loss (equivalent to a temperature of xx in still air). Objects (eg batteries) in a winter wind never get below the actual air temperature, they just cool off really fast.

Now if you had an object being sprayed with something that would evaporate at a winter temperature (ether, maybe brake cleaner), then yes you would get cooling below the winter air temperature.
 
Doesn't make sense though. The cooler damp air should be heavier that the hot air at the ceiling and that should go out the vent first.

You're right about the rest. You direct where you want the cool air to go with open windows.
You would think, but it's apparently not working. Someone else mentioned the garage door being open, which I must have missed. Too large an opening won't work. Perhaps close everything off other than the roof vent? The lack of insulation may also not allow the cooler to keep up no matter what.
 
For a swamp cooler to work you need humidity below 30% - which in Florida is never. The temperature drop has to do with how fast the water will evaporate.

In the desert it stays well below that likely all summer - probably down below 15% on a hot day. They still use them in commercial and industrial out west.
Living in Humid South Carolina ALL my life a few years back I wondered what those roof top boxes were on homes out west.
I had never even heard of a swamp cooler util recently.

Very cool idea but at the South Carolina Coast that won't work! In my area I find any and every HVAC can struggle, Everything except Ford (s) !

The wife and I the last 20 years living at the beach have owned ALL NEW vehicles from Dodge, RAM. VW, Honda, Subaru and ALL those new cars / trucks we purchased new struggle in my area in the summer, heat. Even my OLD retired 2002 Ford E-250 Time Warner Cable van WILL run you out with the AC on low!
Say what you want about Ford but I have found NOTHING cools like a Ford product and I have owned many!
 
A boxed-in garage with a single opening is an oven.

In my previous home, the garage had a powered garage door in the front as usual, but also a manual garage door in the back that opened up to the back yard. It allowed optimal airflow, and a fan could create a nice breeze while working on something. I know that you're in a very hot, dry environment, but I'm in a very hot, humid environment, and it seemed to work very well.

I have often wondered why more garages aren't like this, especially with so many homes crammed so close together that a garage pass though to the back yard like that would come in handy.
 
It's currently 109 in there. I did have a small swamp cooler on wheels in my shed. Got it out and got it ready to blow just on me when I'm out there.

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I just ordered this from Costco, $289. Tried it yesterday, lowered my insulated garage from 79 to 75 in 2 hours and also dropped the humidity from 63% to 43%. It was 93 outside and the garage is below a living space that is cooled to 85 when nobody is there. It really doesn’t get very hot being somewhat below grade and well insulated.

The portion I was cooling is 930SF and has 10.5’ ceilings which is asking a lot of a 12k btu unit. I don’t doubt it could get it to be 70 or less when 93 outside so I’m thrilled.

It’s hotter where you live and no insulation will make it tough though.
No idea why the image is turned 90 degrees.

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Heads up, those Media's have been recalled with a send back paid shipping/you get a check if cut the powercable or send you a drain kit, your choice. Mold issues.
 
I managed a business that had a warehouse about that size, two rooftop evaporative coolers kept it pretty tolerable.
This ^^^^^^^^^^^^^^^^^

I have a roof mounted evap cooler in my garage, and it works very well. If the dewpoint stays 50 F or below, I can maintain a 20 / 25 degree difference in the outside temp.

I have an attached 3 car garage that is boat deep. Just under 1,000 sq. ft. If the dewpoint gets down to 30 F or below, it will actually cool as good or better than my A/C cools the house.

I keep most all of my ammo out there, as well as all of my reloading equipment, with no worries at all. I also have upduct discharge, so the air from the garage exhausts upward through the attic, and out the side attic vents which further helps by keeping the attic much cooler.

The only thing I added were a set of insulated garage doors, which help immensely. With the standard non insulated aluminum doors when the late afternoon Sun was hitting them, you couldn't keep your hand on the inside of the door for more than just a second. Now they're the same temp as the inside of the garage itself.
 
In neighboring Rockland County, NY there is an old hospital compound.
A food and supply warehouse was built underground. The entrance was down a ramp and you exited by going up in the same direction.
Both food handling and supply services were transferred to modern buildings and the underground building became the service garage...it was that big.
The guys there loved it.

Do like the Australians....build underground to avoid the heat.
 
Heads up, those Media's have been recalled with a send back paid shipping/you get a check if cut the powercable or send you a drain kit, your choice. Mold issues.
Mine was the recalled unit. They were unavailable for a time so they could add a different drain plug to the package with a little insert about swapping it.
 
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