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How To Cool A Garage With No Windows

Keeping your windowless garage cool is a balancing act for many people.

If you’ve often wrestled with the dilemma of keeping your garage door open or closed to regulate the temperature inside, you’ve come to the right place.

Let’s get some home truths out of the way first. Opening your garage door to cool it will only work if the weather near you is habitually warm and if the sun is shining down on you often.

You can open your garage door if the sun is nowhere to be found but, if it is shining right on your garage, you’re going to need other ways of keeping it cool.

That’s where we come in. Here we’ve got a few tried and true methods of keeping the heat out so that your garage can stay cool and pleasant come rain or shine.

All of the below methods can be simplified as keeping the outdoor temperatures out while using cooling on the interior.


We have a word for keeping outdoor temperatures out, and that’s insulation.

By insulating your garage, you can be prepared against both temperature extremes as you’ve effectively isolated the climate of your garage from that of the outside world.

No, insulation isn’t just about keeping the heat in. When used properly, it can work just as well to keep heat out and cold in, and vice versa if you wish.

So how is this going to work? You have options. First, you should forget the notion that insulation is going to be expensive. Yes, getting insulation in your home walls can cost a lot and requires skilled contractors to pull off, but with garages, this process is a lot simpler.

The services that do offer insulations may even have a service to insulate your garage but make sure you’re not overpaying; it shouldn’t usually cost as much as standard insulation procedures.

If you’re into DIY, you can even insulate your own garage yourself. You’ll need to buy the insulation, obviously, but this can only set you back tens of dollars if you hunt for a good deal.

Once you’re geared up and have any safety clothing that may be necessary, you can go about insulating your garage for no extra cost.

Whether it looks good when you’re finished is another thing, so you’ll need to weigh up how rough your garage can look.

Coolers, Fans, and Air Conditioners

Modern-day fan and cooling technology have come a long way, to the point that investing in a standard pedestal fan might be just what you need to regulate the temperature inside your garage.

With fans, you can get powerful standing models that sit easily within a garage and won’t intrude upon the space.

We’d recommend an oscillating fan but industrial and bladeless options exist if money is no object for you.

If you’re in desperate need of cold air, you can place ice in front of the air stream of your fan, dispersing colder air throughout the garage.

Otherwise, you might want to get a cooler. That’s an evaporative cooler, by the way, not something you keep your alcohol in on a warm day out.

You may know them as swamp coolers and they’re as close to air conditioning as you can get, but with none of the price attached. You can even add ice to a cooler so that the air it cycles through your garage will be colder from the start.

The most effective but expensive option is to simply get an air conditioner for the garage. While many homes have air conditioners, it’s much less likely that your garage will and that’s why the temperature inside garages is harder to control.

Air conditioning is expensive but you can choose between robust wall or split conditioners that’ll require professional installation or a portable air conditioner that you can set up yourself.

Whichever one of these options you go for, it’s needless to say that you want to close your garage door when doing this. If you don’t the air is just going to escape without having any significant effect on the garage space. 

Sometimes your home will get warm too and one of the upsides of these setups is that you can open the interconnecting doors and let some of the cold garage air enter your house.

Promote Airflow

Speaking of that door that separates your house and your garage, the cooling airflow can work the other way around too.

If your house is consistently cooler than your garage, probably because it has all the expensive ventilation and cooling systems that a garage doesn’t, then you can leave that door open to let cool air from the house flow into the space.

We’d advise you to never leave the door to the garage open or unlocked when you turn in for the night as it can present a security risk.

If you have got fans or other immediate cooling systems inside your house, you can use them to improve the airflow around your house and into your garage.

Remember that by opening your garage to the rest of your home, the effect will go both ways. This means that while your garage will get cooler, your house will get warmer as the temperatures mix and equalize.

Get A New Paint Job

This one is simple and isn’t going to have a large change in the environment in your garage but it’s a handy tip for the future.

We’re sure you know the relationship between colors and temperature, like how black will absorb and hold onto heat much more than white does. 

This applies to paint jobs too, so try not to have the walls or roof of your garage be a dark color. If you have the time and the means, painting your garage a lighter color, or just white, can be a great way of naturally cooling the space.

The opposite will be true for winter, so you need to decide which one is more of a nuisance and target that, unless you want to repaint your garage twice a year, every year.

Let Engines Cool

This is the simplest method that you can start doing right now.

Car engines get warm when in use, hot even, so sometimes it’s best to let that vehicle cool down before putting it in the garage. This is especially the case if you’ve been driving outside in hot weather, and if the car is one of those heat-attracting colors that we’ve mentioned above. 

Leaving the car at a secure location outside for an hour can make a big change to the garage space once it’s parked inside.

Preferably, parking it somewhere where there’s shade coverage will help speed up the cooling process. Consider adding this easy step to your routine after you return home.

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