Does putting ice in front of a fan really work? – I put it to the test
By Jason Wooden, PhD | August 24, 2021
I did a simple test with ice in front of a fan on a hot day and found that the right setup could create a stream of air 10°F cooler than room temperature.
However, the cooling was limited by the power of the fan, the type of ice, how quickly it melted, and how far away you were from the setup.
If you’re looking for other ways to cool down, you can try cold compresses, ice packs, frozen wash clothes, cooling mattress pads, DIY homemade ACs, and various other remedies.
Why we’re so curious whether putting ice in front of a fan works
Nothing is worse than being uncomfortably hot and nothing you do seems to cool you down. Whether it’s a blistering hot summer day or a warm night during a heatwave, we’ve all been there.
Too hot to get anything done by day and too hot to sleep at night.
So, I get why people are curious online whether putting ice in front of a fan actually works.
Maybe you’re strapped for cash or can’t get your hands on an AC unit because they’ve sold out…
Or maybe you live in an area where AC is not usually needed…
Regardless, it’s all the same – miserable days and miserable nights.
Yes, it would be great if you had air conditioning but what if all you have is a household fan and it’s not getting the job done?
Out of desperation, you’re willing to try anything to cool down including something as crazy as putting ice in front of a fan.
Will it really do anything?
Is it worth the time?
I was curious myself so I put it to the test.
The science behind using a fan with ice for cooling
Okay, the basic idea is pretty simple – ice absorbs heat as it melts.
If you blow warm air across ice with a fan, the air will be cooled as the ice melts. So, warm air goes in and out the other end you get cool air.
That’s how things should work in theory. However, there are of course some obvious limitations to keep in mind.
First, the warmer the room is, the less cooling you’ll get and the more quickly the ice will melt. Secondly, the bigger the room you’re in the less cooling you’ll get for that space.
That means you’ll get less cooling in a big room on a very hot day.
And it also won’t last as long as it would it a smaller space that isn’t as hot.
My simple cooling test with a house fan and ice
To test whether putting ice in front of a fan works, there are lots of different ways I could do it.
Basically, what you want is to move warm air so it comes into contact with something cold.
You could use ice in various forms, a bottle with frozen water, or cold packs.
For simplicity, I decided to give ice cubes and a solid block of ice a try.
If you’re wondering why, it’s because with ice cubes you get lots of surface area and spaces for the air to flow across.
With the solid block, I could see how well things work with something that has less surface area but will take longer to melt.
So, my basic set up was:
- a household fan
- ice cubes in a basket or block ice in a pan
On a hot day, I bought a 10 pound bag of ice and a block of ice.
First, I tried setting it up with a smaller fan:
I started with a desktop fan I thought would do the job. I checked for air flow using a piece of bath tissue and quickly realized it was too wimpy even at the highest speed setting.
It wouldn’t be strong ice to move air through my setup. I needed to go bigger.
More power, more air flow.
So, I tried a bigger and more powerful fan:
It past the air flow check, so I went ahead and added the ice. The cool air it created was about 10 degrees Fahrenheit cooler than the room!
However, the air wasn’t as cold farther away from the ice.
The other thing is that the ice melted pretty quickly. More than half the ice was gone within 15 minutes!
I also had to add a pan to collect the water.
Next, I tried it with a big block of ice:
While it didn’t melt as quickly as the ice cubes, the air was only about a degree or two cooler than the room.
That wasn’t too surprising since there’s less ice surface area for the air to run through.
The Verdict: Does ice in front of a fan really work?
I think you can see from my simple test that I was able to create a nice stream of cool air.
I got the best results with a more powerful fan and ice cubes.
However, it only works so well because:
- the ice cubes melts pretty fast
- if it’s really hot, it will melt even faster
- you need lots of ice on hand to keep if going
- it wouldn’t be able to cool a room
It can give you some relief as long as you keep it close to you. For me, I think this might work as a desperation measure if I use it at my desk or on the night stand next to the bed.
So, yes, putting ice in front of a fan can give you some cool air, but not long.
I suppose if I had a bigger fan and unlimited ice it might do more, but then you run into other issues.
You can decide whether it’s worth your time.
Meanwhile, let’s look at what else you can do to cool down.
Other tricks worth a try to cool down when it’s hot
Putting ice in front of a fan isn’t the only trick that may help you cool down. Depending on your situation, there are plenty of things worth a try on hot days and nights.
Some will give you a bit of short-term relief. Others will require an investment of time and money.
2) Take a cool shower
Another quick and time tested remedy.
3) Take a quick swim
If you have access to a pool, a quick gentle dip can help cool you down and feel refreshed.
4) Try a cold compress
You can place it on your neck or forehead.
5) Try an ice pack
If you don’t have a store bought one, you can make your own ice pack with ice cubes in a Ziploc bag. You can also try a plastic bottle filled with frozen water.
Be careful how long you use it so you don’t get an ice burn or frostbite. To be safe, you can wrap it in a towel.
8) Double up on the fans
Place one in the window to move out hot air, place another inward to move air around the room.
9) Relocate to a cooler spot
Try sleeping downstairs or in a basement. Sometimes, even sleeping on the floor can make a difference.
10) DIY homemade AC
Depending on how comfortable you are with home projects, you can make your own AC unit!
11) Temporarily relocate
If all else fails, temporary relocate to somewhere that has AC whether it’s a relative, friend, or hotel. If it’s a coming heatwave, be sure to make your hotel reservation early.
Bedtime cooling remedies to help you get to sleep
Getting sleep in hot weather can be almost impossible on a bad night. Running a fan with ice and the various remedies I’ve already listed may help.
Other tricks you can add to the mix include:
Freezing your bed sheets
Switch to cooling sheets
Made from materials like cotton, bamboo, and linen, they’re engineered to help you stay cooler.
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