Instructables
Recently I listened to a podcast from an Air Conditioning expert, which I didn't even know existed . It got my brain going about how to stay cool without using an air conditioner.

I have been trying some of his tips, plus some of my own ideas, and thought I'd share them here.

The results have been very successful, and at my house we now run our air conditioner for only brief periods of time throughout the day while the other tenants in our unit blast theirs almost nonstop.

The most interesting thing I discovered is just how arbitrary the standard 72 degrees F is. I am convinced that this temperature is based on wearing a business suit, which people almost never wear in their own homes in the summer. The truth is that there is no ideal temperature.

These ways to stay cool fit into three categories: Lowering the temperature of your house, lowering your body temperature, and changing your perception so that the heat doesn't bother you so much. Not all of these steps are practical for everyone, but if you can find one or two that you can turn into habit, it can make a difference in comfort and/or in energy consumption.

In addition, I have listed some bonus "green" benefits on each step where they apply.
 
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Step 1: Get naked!

Or at least closer to naked.

I know this isn't for everyone, but its amazing how much more comfortable 80 degrees Fahrenheit feels if you're shirtless.

If you live on your own then this is no problem.

If you live with close friends or family, then wearing just your underwear is probably not a big deal either.

If you live with roommates, you can wear lighter-weight clothing like shorts, tank tops, etc. Even going barefoot helps your body eliminate heat more effectively.

In any case, you can probably wear as little clothing as you like at nighttime while you're in bed. If it feels strange at first, give it a few nights and see if you don't get used to it. While you're at it, get rid of your blanket and just sleep under a top sheet.

Wear fabrics like jersey cotton, nylon mesh or linen which don't hold onto heat.

BONUS: You will end up doing less laundry.
BONUS: Your clothes will last longer since you are spending less time wearing them and not washing them as often.
BONUS: Being naked is fun.

Step 2: Get Wet


Take a short (5-10min.), cold shower whenever you feel too hot. It lowers your core temperature which means you'll stay cool long after you get out of the shower. This is great when you come home after work and first walk into the house. Plus you'll be undressing anyway (see step 1) so why not cool off a bit more while you're at it?

This is also great right before you go to sleep since the body must lower its temperature before you can fall asleep at night. I fall asleep much faster this way in the summer.

If you don't like the shock of stepping under cold water, you can try a cool shower (which works just as well but takes a little more time) or you can start off with a moderate temperature and slowly reduce it every minute or so. This has its own relaxing quality, much like if you were slowly raising the temperature.

Make sure to get your hair wet; that will keep you cool even longer.

If you are following step one and do not need to put on a bunch of clothes, then there's no need to dry off. The water on your skin will act like sweat and carry away your body heat as it evaporates.

BONUS: A cold shower uses less electricity than a hot shower. Saves money & carbon emissions!
BONUS: Your house will not get full of hot steam, which raises the temperature.
BONUS: If you like long showers, you won't use up all of the hot water no matter how long your shower is.

EDIT: Several people have suggested getting your clothes wet and then putting them on to stay cool. I don't do this because I don't like having heavy clothes hanging off of me, slowly me down, getting my furniture wet. But if you don't mind these things, then go for it. It will indeed keep you very cool.

Step 3: Get hydrated


Keep a jar or pitcher of tap water in your fridge and sip it throughout the day. The water will absorb your body's heat as it gets absorbed by your stomach.

Even drinking tepid water will help keep you cool, since being fully hydrated makes it much easier for your body to thermoregulate.

Some people don't like drinking water. Try making some sweet tea or herbal iced tea. You can steep tea iced tea while its in the fridge if you do it for several hours. Sweetened drinks, though not as effective as water, will help keep you hydrated too.

BONUS: Being hydrated improves performance and concentration, prevents fatigue and headaches, and controls hunger.
BONUS: Choosing tap water over bottled water conserves additional money and natural resources. Most tap water is as clean as or cleaner than most bottled water.

Step 4: Fans!

Picture of Fans!
100_4538.JPG

Fans are much cheaper to run than most A/C units and moving air feels cooler even when it isn't. This is because it blows your body heat away as soon as the heat exits the body. It also helps to evaporate any sweat that might be on your skin or any dampness still in your hair from your cold shower, which will cool you through evaporative cooling

If the outside temp is cooler than the inside temp, you can position a fan in your window to bring in air from the outside.

To take it a step further, place a fan in the window on each side of the house, but point one fan toward the outside so that it is sucking air out of the room. This will create an air current through the entire house. If you have two floors, put the "outside" fan upstairs and the "inside" fan downstairs or in the basement. This is similar in principle to a whole house fan.

Finally, make a paper fan or a cardboard fan. Get in the habit of fanning yourself while you're just sitting watching TV or browsing instructables.

BONUS: You can make funny voices by speaking into your fan!

Step 5: Windows

Picture of Windows

Speaking of windows, open them! Keep them open all night and then close them as soon as the outside temp exceeds the inside temp. In the evening, when your house has heated up, open them again.

If the sun is shining in your windows, close your blinds or shades but leave your windows open.

Step 6: Home Improvements

There are lots of improvements you can make to your house to make it cooler. Here are the easiest ones:

-Paint your house white. If your house is cinderblock or brick this can make a difference since white reflects more heat than darker colors.

As we saw earlier, you can install a whole house fan.

-Get some shades above your windows and blinds that will let in air but not light. This way the sun won't shine into your room making it warmer. Plus you can have the windows open without the neighbors seeing you walk around in your briefs.

-Plant trees near your house, especially by windows. This is yet another layer of protection from the suns rays.

BONUS: Trees!
BONUS: Some home improvements, such as improving your insulation or installing heat-reflecting roof tiles make you eligible for tax deductions.

Step 7: Turn off the lights.


In the daytime there should be plenty of light coming into the house through the windows. Light bulbs not only emit heat; they also make it seem warmer.

This means that, believe it or not, turning off lights will make it seem cooler. Try it and see if it works for you.

BONUS: Less electricity spent on lighting.

Step 8: Turn off everything else.

Turn off your dryer and hang your clothes to dry instead. Turn off your stove and have a cold salami salad or a bowl of gazpacho. Turn off all of your large and medium appliances when not using them and find alternatives.

All of these appliances emit heat, which you're trying to get rid of. If you don't use them, you won't have them dumping more heat into your house.

With your fan on, you can hang up your wet clothes inside the house instead of outside. As the fan circulates air through your wet clothes, it will cool the air through evaporative cooling. Your clothes get dry, and your house gets cooler. Win-win! (Note that this works much better in dry climates than in humid climates.) Thanks to javandyck for this tip!

BONUS: It will save even more electricity, money, and carbon emissions.

Step 9: Speaking of perception...

Hide or get rid of any thermometers in your house. Unless you're a weatherman, there is no need to know the "number" for the temperature.

Your skin is covered in thermoreceptors, and those are the only thermometers that matter. When you feel hot, turn up the fan, take a cold shower or, if needed, turn on the A/C for a little while. But thermostats and thermometers breed discontent. You might be feeling perfectly comfortable but see that its 80 degrees in your house and it will convince you that you're supposed to feel hot. So of course, you will start to feel hot. If you have a thermostat that insists on displaying the temperature, cover it with a piece of tape.

This is a silly little trick, but its also easy to do and works very well for most people.

Step 10: Just be cool

Picture of Just be cool
As you're trying out these steps, keep in mind that for most of human history there has been no air conditioning. People who lived 100 years ago were not unhappy, unproductive, or miserable without it. Simply keeping this in mind will help you realize that it's not that hot.

Another thing to remember is that if its summertime, its okay to feel hot. Isn't that what we spend all winter wishing for? Let it be summertime and be a bit warmer. Eat some melon. Take a nap. Swim. Go to a BBQ. Its supposed to be warm!

Humans have lived in every climate for thousands of years. When did we get so fragile that we had to always be at a constant temperature of 72 degrees? Who came up with that number anyway?

Well that's the end of my rant and my instructable. Just remember that its okay to feel hot when its hot.

See you at the swimmin' hole!
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Bindlestiff (author) 1 year ago
Many people have said that this will not work in humid climates. While it's true that it doesn't work equally well in every climate, water still evaporates in every climate, even if slowly. Your mileage may vary with this step, but give it a try even if you live somewhere damp.
I use an earthen pot to store water. It keeps the water cool and fresh. Unlike the refrigerator the water is not chilled but refreshing.

aavaas.com/wp-content/uploads/2008/04/matka.jpg An earthen pot or *Matka* as we call it in India.
Bindlestiff (author)  shaileelathe3 years ago
These pots are a great idea as they keep water cool through evaporation. This means that you don't have to waste the energy and fridge space on a bottle of water.
marcintosh3 years ago
When I lived in the Caribbean  I learned that when it's really scorching hot,  talk softer, walk slower and smile more.  It really makes it more bearable.

Bindlestiff (author) 3 years ago
Thanks for reading this instructable, everyone in the world! There are a lot of great points and new tips made in the comments section, many of them beyond my own experience. Feel free to try them and continue commenting. I hope its ok if I don't add them all to this instructable since I don't have experience with them.

Since carbon emissions are important to a lot of people, including me, I do mention that doing many of these things can reduce carbon emissions. However I want to discourage using the comments section to debate global warming. Save that for next time you have dinner with your in-laws.

This instructable is about cooling down yourself and possibly your house, so please limit discussion to that and MAYBE to talking about colonial British military officers and their bushy mustaches. Thanks!
adunster1 year ago
If you have a "safe" area to do it outdoors, you can also make tea in the sun in a glass jar, then take the bags out when you place the tea in the fridge to cool. Takes a few hours, but you don't need to fire up any burners or otherwise directly heat any water.
sgutperl3 years ago
Thanks for the ideas. We didn't have much of a summer this year but since A/C isn't quite as common around here as it is in the US your ideas about doing without sure are appreciated. Thinking back to my last visit to the United States I'm still shocked how people living through a hot, hot summer (not humid, really dry heat) would put their laundry in the dryer instead of hanging it outside and let the sun do the work. All that wasted energy and extra heat!
In some locations it is against residential code to hang laundry lines as some people seem to feel it is unsightful :(
squtperl,
I don't have a dryer. I hang my laundry outside in the summer, and inside in the winter if it's too cold or overcast. But in answer to your statement of why American use dryers instead of hanging them outside is due to people, in cities and towns, stealing your clothes of the lines. Had a friend that this happen to in a small town. I don't have this problem as I live out in the country.
It's supposed to be hot, but it's not supposed to be a blast oven every single day, over 102, and up to 110 for months on end! That was never a problem before now. I do very much love your suggestions; they make lots of sense in an average summer. Texas isn't having an average anything; colder and snowiest winter EVER in 2010-2011, second hottest summer EVER this year (so far; it's only mid August), the first was in 1980. Our forbearers didn't deal with THIS. We would certainly, many of us, die without A/C, and some have already, But I do applaud your ingenuity!
I agree! TX had it worst then OK, but still...a 120 heat index was a bit much to bear. Lost everything in my garden due to the heat, and July no rain. I save on electric in the spring, fall, and winter months. My electric bill is high four months out of twelve...so I fell I am not doing too bad in saving.
Bindlestiff (author)  bstacy-canelakes3 years ago
Yeah, I hear it's been unbearable in some places. We have only had a couple of days over 100 this summer in Salt Lake City, so it is much easier to get by with no A/C. I imagine there are many for whom my "just let it be hot" advice is of little use, but my aim is to help people use their A/C less often rather than not at all. I definitely still use mine once in a while!
grannyjones2 years ago
It all depends on your humidity.
Summertime humidity in many states gets into the 80's and beyond.
Dehumidifying the air to 50 percent makes even a hot room more comfortable.
In drier states, the humidity is lower than 30 percent, making the use of evaporative (swamp) coolers effective.
Natural body cooling works best if humidity is in the 30-50 percent range,
bhvm3 years ago
You forgot one important suggestion, Thats plant More trees!
A lush backyard and living walls can keep your house about 5 degrees cooler than bare house!
Bindlestiff (author)  bhvm3 years ago
Great advice, and it is in the instructable. Thanks!
dimtick3 years ago
I don't have time to read all the comments so I'm sorry if this comment has already been made.

this is a tip that i use. I live in a 2 story house with a basement. heat rises. our basement is much cooler than the second floor so in the hot summer days we simply hang out in the basement (it's fixed up so it's nice).
with ventilation what I do is I open all the windows and put fans blowing out only in the second floor windows (keeping doors open). because heat rises the fans will exhaust the hot air and draw in cooler air from below. this is called "chimney effect". along the same lines I also have a big fan in my attic to exhaust the attic heat. keeping the attic cooler can really help the rest of the house.
another thing that i do is during the summer I close all the lower level return air grills so that when I run the air conditioning, the furnace is sucking in the warmer upstairs air rather than the cooler downstairs air. (in the winter I do the opposite).
pfred2 dimtick3 years ago
It probably wasn't so much heat rising that you were taking advantage of as ground constant temperature. At depth below ground level is an area's average temperature which is usually pretty low. The median ground temperature of most of the USA is around 57F

Scrolling down on this page leads to a soil temperature map though the whole page is pretty interesting on the topic of climate control:

http://www.buildingscience.com/documents/digests/bsd-113-ground-source-heat-pumps-geothermal-for-residential-heating-and-cooling-carbon-emissions-and-efficiency
You are fortunate with a 2-storey house. I have had apartments with windows only on one side. I created a "cross" breeze by opening one window in one room and blowing the fan out the other.
pfred23 years ago
If you are going to put a fan in your window and the air outside is cooler than the air inside then face the fan out because as everyone should know heat expands so exhaust hot out, to work with the natural thermal flow. Interior temperature will drop quicker than trying to blow cool air in. There really is no such thing as cold, only the absence of heat.

In other words if you find yourself with an abundance of excess warmth be generous with it and toss your extra out the window! You really cannot blow cool in as there is no such thing. You can do something like it, but it is inefficient. What you're really doing is pressurizing your interior and forcing hot out elsewhere.
blodefood3 years ago
The fan direction is a valuable comment. I see so many people just blowing a fan in any direction when it is cooler outside and keep complaining that it is still hot inside.

By the way, most bottle water does not come from a mountain stream in the alps. It is tap water. If you already have reasonably good water there is no need to get bottled water.

That said, you can freeze bottles of water and prop them up in a bowl with another bowl upside down inside the larger bowl and blow a fan across them to cool the air. It should take out some of the humidity as the condensation will run into the large bowl. Note: the second bowl inside prevents condensation underneath the larger bowl.

Practical ible!
Phil B3 years ago
When the British ruled India they discovered that you feel cool if you can keep your knees cool. That led to what we call Bermuda shorts. We lose a lot of heat through the top of our heads. Wearing a stocking cap in the winter helps a person feel warm when a room is cooler than normal. Removing a hat in warm weather helps a person feel cooler. And, running cold water over one's wrists, or holding ice wrapped in a cloth on one's wrists cools a person, too.
You are right. Also cooling the feet cools the body. Sitting with your feet in a basin of cool water keeps you comfortable. Because the quickest exit for heat is through the top of your head, sitting with a damp cloth or an ice bag on your head will keep you the coolest of all the body cooling tricks; it also will make you look the silliest, a small price to pay for comfort in the heat.
Again, the idea that you loose heat most quickly through the head is a myth.
However if your brain is cooler you will feel cooler. There -are higher proportions of blood vessels and capillaries near the surface of the head, thus why even minor head wounds can bleed so profusely. The locations mentioned act as a sort of hyper efficient radiator for heat exchange. There is also a higher density of fatty tissue and in some cases denser skin that can inhibit the transfer of heat in other areas of the body. Finally the overall density of temperature sensitive nerve cells is highest in those areas as opposed to others.

As for the myth or not status... likely more true than not in reference to the entirety of the body however, since we as a society are much more likely to be wearing at least one, if not more, layers of clothing that will form an insulating layer against the body and not always wearing a hat, there is a much higher likelihood of more heat escaping from the head area than anywhere else.
And again, this is just not so. The thermoregulator and temperature sensor in the brain is located in the hypothalamus, which is next to the pituitary, which is right above the roof of your mouth. The vessels that feed it are not connected to the ones that feed the scalp. The temperature of the head does not effect the temperature of the blood entering the hypothalamus.
Likewise, it is simply not true that the density of temperature sensors is higher in the head than elsewhere. In fact, the highest number of such sensors is in the hands and feet.
Finally, the issue of clothing is also moot, as we are also far more likely to have hair acting as a much better insulator than a few layers of clothing.

I know people just don't want to let go of their treasured beliefs, but there is no Santa Claus, Virginia, there is no research that says we need to drink 8 8oz glasses of water, private enterprise is not any less likely to be more inefficient than government, and we do not loose most of your heat through out head (in fact, we lose very little heat through our heads).
You REALLY need to do a LOT more research before you start spouting your drivel as facts... after doing said research through various medical books, scientific journals, thermography sites and a host of other locations, I can easily refute most of your arguments. Since I view you as nothing more than a typical internet troll, I will not bother with the listing of these documentable facts, photos and medical charts as it will only fuel you to further declamations. Suffice it to say that you are mistaken and despite the misleading rhetoric that you trotted out as fallacious "proofs", there is a much larger body of evidence in the medical and scientific community that renders your arguments as specious and incomplete.
Bindlestiff (author)  Phil B3 years ago
Haha. I love the idea of a bunch of British military officers sitting around in their pith helmets, with their bushy mustaches, and one of them suddenly says "I say, these trousers are most disagreeable!"
I like the part where you stereotype everything.
Bindlestiff (author)  jamwaffles3 years ago
Specifically, I picture him looking like the late actor Lionel Jeffries as seen in "Chitty Chitty Bang Bang." Nobody has a mustache like him!
What an imagination you have ;-P On second thoughts, it's probable that quite a few people from back then _did_ look like the stereotypical Brit xD
Awesome image! I love it. I can see their bemused faces as they stare at their trousers in frustration as if noticing them for the first time. Agreeing mumbles and harrumphs from everyone in the room fluffing their long mustaches. Until finally one pretentious young solider walks in the tent with his trousers cut off at the knee to the stunned silence of everyone in the room. A choke and splutter of smoke from the interrupted pull on a long stem pipe by a white haired officer in the corner. And a trouser revolution is born.
Bindlestiff (author)  eric296093 years ago
And whimsical a musical number to drive the point home!
Bindlestiff (author)  Bindlestiff3 years ago
also: monocles.
Baha! You've set the scene perfectly. Good job, sir. Also, I'm British. Really liking all this rain and summer; my favourite day of the year. The pies are good, though!
Bindlestiff (author)  jamwaffles3 years ago
I spent two wonderful years in Britain, yet my imagination still defaults to Mary Poppins, Chitty Chitty Bang Bang, The Pirates of Penzance, and other such nonsense when I try to imagine anything that happened there more than 50 years ago. Accurate? Not the slightest! Delightful? Absolutely!
With that visual, I imagine the late Terry Thomas in the mix. Lol
LOL I think he wore that very outfit in several movies but my fav was It's a Mad, Mad, Mad, Mad World (more or less mads?)
Bindlestiff (author)  T-DSkully3 years ago
I googled Terry Thomas and discovered that you are correct.
I do not know the details, but your scenario is as plausible as any.
The 'losing "a lot" of heat through your head' thing is a myth. In winter, when you're bundled up and not wearing a hat, of course most of your heat loss is through your head (which is how the original military study of heat loss was conducted, getting that "lose up to 50% of your heat through your head" myth started). You lose no more than 10% of body heat through your head when all things are equal. I'm not saying your suggestions aren't sound ones, just that a lot of people have the idea in their heads that it has a bigger effect than it actually does.

And yes, I have more than just my own opinion. :) http://www.guardian.co.uk/science/2008/dec/17/medicalresearch-humanbehaviour

Also, hair. Cutting your hair short helps you cool down. When your head sweats, more evaporative cooling can take place if wind can blow through (at least in regards to how I feel on a bike with shorter hair vs longer hair). I'm guessing this is related to the palm/sole cooling technique I describe below.

You can lose quite a bit of heat through the soles of your feet and palms of your hands, thanks to dense capillary networks. Grabbing a fridge-cold soda and holding it against your palm for 5 minutes will accomplish two things: 1) making a can of warm, gross soda and 2) it will stop you sweating if you are sweating. It works thusly: A lot of blood gets cooled down, pumped back into your heart and thence to the rest of your body. This technique is known as core cooling and was discovered by some Stanford scientists. They of course invented some $5000 gadget to help pro athletes train. I grabbed soda from the fridge. ;) Sometimes I get one of those ice packs (the kind with thick, rigid plastic on the outside, not the cheapies with thin plastic, because the thicker plastic means they aren't too cold at the point of contact. Too cold makes your capillary network shut down as a hypothermia-preventative.) and sit with a foot pressed against it. Works pretty good but I find I have to switch feet periodically for the best effect.

Here's the link to the Stanford informations.
http://www.stanfordalumni.org/news/magazine/2005/julaug/features/cool.html

I'm guessing that your wrist technique works the same way, but is probably less effective than palm due to a lower amount of blood flow. The cold water on palms or cloth-wrapped ice on the palms will work great though. Same thing goes for sticking your feet in cold water, which is why it feels so good on a hot day. :)

Also, I'd have to guess that the knees thing is related to the wrist thing, since knees are mostly full of bone so the blood will have to flow around the outside, closer to the skin, and thusly exchange more heat than if the veins were along the bone insulated by muscle elsewhere.

This also works in reverse. Want to be warm in the winter? Insulate your feet and hands! That's why rubbing your hands together or sticking them under your arms is an instinctive way to try to warm up, and why sitting with your feet towards the fire feels so durn good. :)
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