What are your advices to cool homes without AC ?
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Years ago I was watching Doomsday Preppers and one fella dug a long trench, 100 foot if I'm not mistaken.
In the trench he laid a large PVC pipe and filled in the trench. At the far end of the pipe there was an air inlet. He ran the pipe into his basement and up inside a wall with an inline fan. Cool air, as well as fresh air.
Didn't do anything for the humidity, I suspect.
He claimed it worked, I can not confirm.
It does make since as it's about 4c/39f four feet/1.2m underground.
wrote on last edited by [email protected]So DIY ground source heating/cooling, basically.
I suspect that's not long and deep enough, but if it is, it will produce air at the local year-round average temperature, at all times. (Whatever that happens to be)
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People in hot climates do not sit outside. They also do not open their windows. Because they're not insane.
In hot and dry climates, a breeze in a shady place works well, actually. In humid places it's harder.
That actually has results counterintuitive to temperate people when it comes to clothing. Arabs don't just cover up for modesty.
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As a northern Canadian, I kinda chuckle at the need for an air conditioner. Of course, my punishment in winter.
wrote on last edited by [email protected]They're becoming more common in the populated areas of Canada, although it's still a minority that has it where I live as well.
Climate change is really obvious at this point, and the smoke is awful...
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So DIY ground source heating/cooling, basically.
I suspect that's not long and deep enough, but if it is, it will produce air at the local year-round average temperature, at all times. (Whatever that happens to be)
Thats basically how earthships are cooled. You can also run the pipe through an evaporative cooler to cool the air even more.
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Thats basically how earthships are cooled. You can also run the pipe through an evaporative cooler to cool the air even more.
You can also run the pipe through an evaporative cooler to cool the air even more.
At some point there, you've just reinvented AC.
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Air flow was key. Tried to get a good cross breeze from one end of the house to the other (unless the breeze is also hot). At night, we'd use a box fan in the window or door to get all the hot air out. If you can block your exterior walls/windows from getting direct sunlight, that should help. Curtains work (or you could also just place objects or plants in front to block the sunlight). Alternatively, you could install one of those large roll up sun shades for a more permanent solution. Did that for a few windows that get a lot of sun and made a big difference.
From personal experience, the following made a difference (but some will have a lot higher cost):
- Replacing the insulation in the roof/attic. You could also add radiant barriers, but insulation is probably a better bang for your buck.
- Insulating the exterior walls (drill and fill). Our walls used to be hot to the touch in the summer before this.
- Double pane windows
- Seal any air gaps or holes. Expanding foam is pretty good at this.
From what others have told me:
- Installing a whole house attic fan to evacuate hot air at the end of the day. My neighbor did this and swears by it.
- Painting your house a lighter color. Can't say how effective but makes sense intuitively.
Stuff that only sort of worked:
- Swamp coolers. Works ok in a pinch, but your house will feel humid like the tropics. Would personally skip.
- Portable AC. The exhaust hose gets hot so it's not as efficient as an external AC or window unit. But it could help if you're directly in front of the cold air vent.
Painting your house a lighter color. Can’t say how effective but makes sense intuitively.
Probably makes a big difference. I just measured my patio, grass and driveway temps today with an infrared themometer. Grass was 109, patio was 123, and the blacktop was a whopping 148. My wife has been talking about using a cream or neutral gray finish on the driveway, and a 20 degree difference is definitely worth it.
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You can also run the pipe through an evaporative cooler to cool the air even more.
At some point there, you've just reinvented AC.
Only if you use a better working fluid and add compression and expansion steps, but a long pipe in a ditch filled with water isn't what I would call AC quite yet.
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Only if you use a better working fluid and add compression and expansion steps, but a long pipe in a ditch filled with water isn't what I would call AC quite yet.
wrote on last edited by [email protected]Aren't there AC systems that just evapourate water from municipal supplies to the atmosphere?
I mean, yes, I'd agree that blowing air over a standing water body isn't AC, but we're getting close.
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Painting your house a lighter color. Can’t say how effective but makes sense intuitively.
Probably makes a big difference. I just measured my patio, grass and driveway temps today with an infrared themometer. Grass was 109, patio was 123, and the blacktop was a whopping 148. My wife has been talking about using a cream or neutral gray finish on the driveway, and a 20 degree difference is definitely worth it.
Yep, it's a low-tech decision that'll pay dividends. Same reason I'd opt for a white or lighter colored car if it's going to be parked outside.
Should've also mentioned roofing shingles as well. See a lot of houses with dark roofs just soaking up sunlight.
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
wrote on last edited by [email protected]Close on the sunny side during the day. If the air on the shadow side is cooler, less humid or same as inside, open that side. If your home is more humid or hot than the sunny side, close it just enough to prevent sun ray for entering.
If the heat is not also damp, put wet clothes next to windows or fan for natural refreshment. You can also spray water on your curtain.
Wear natural fiber, coton or lint. Loose clothes, that does cover you body. This way, the evaporation of sweat cools you down. You will also smell much less than if you are wearing synthetic fibers.
Wash your feet, your face, your forarm with water regularly. Do not use cold water, room-temperature or fresh is better but go all the way to the articulation (ankle, elbow), wash inside and outside and let the water dry on you.
Drink small amount of water regularly. Once again not cold.
Keep your head cover when you expose yourself to the sun. When you get home change out of your clothes that were heated by the sun.
Do not over exercice.
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Lose weight. I'm totally serious. Thin people have much higher natural tolerance for heat.
It's no coincidence that so many developed countries have become addicted to AC. The fact is that most people there are now overweight and in many (USA most obviously) over 40% are literally obese. Conversely, AC is much less common in places like France and Japan, and it's not just because they're too cheap.
If you want to stay cool in a heatwave, it helps not to be wearing a blubber overcoat that you can't remove.
I gain weight this winter. I have such a trouble cooling down the part of my body that gain the weight. It is hard...
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How is losing weight going to help right now? They can hardly lose enough weight in time for the next heatwave.
Or maybe they're in the menopause.
Or maybe it's 50C out.
Or maybe they're on one of the plethora of medications that causes heat intolerance.
Or maybe they're elderly.
AC is horrifically expensive (energy bills) and terrible for the environment, by the way. People aren't cheap, they can't afford it.
I found it good advice. We don't know every detail about OP life. Of course, some example won't apply but that's fine.
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Aren't there AC systems that just evapourate water from municipal supplies to the atmosphere?
I mean, yes, I'd agree that blowing air over a standing water body isn't AC, but we're getting close.
I think on a purely technical note, Air Conditioning goes beyond just cooling the air and involves reduction of humidity. Personally, I wouldn't consider it AC because you'd have to keep refilling the evaporator resivor, instead of just powering the device, but that is a nitpicky item that isn't technically a requirement.
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My office in Southern Germany doesn't have AC, even though it should. It's the hottest part of Germany.
Give it a couple of years and a few more heatwaves! This is the insidious problem with heatwaves, as I see it. Tolerance for heat and cold is in large part cultural - go to Portugal in winter to see how tolerant people can be of cold indoor temperatures. But with every new 3-day heatwave, Europeans are going to rush out to buy AC units to escape the immediate misery. Next thing we know the continent will be like the US, where it's just unacceptable for indoor temperature to be outside the 19-23C range. And mass AC is just a climate disaster. That's my worry.
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
Sleep outside, if you have a space. Get a deck umbrella, a mosquito net and a cot and a sleeping bag (actually on super hot days I used to just sleep on a towel). It's so much cooler than trying to get by indoors with no AC, even with fans. And it's rather pleasant.
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
Surprised this hasn't been mentioned yet, but awnings. Glass is a superb thermal conductor. Not even the best curtain in the world would prevent air getting hot through the window if the sun is hitting it directly. An awning is meant to shade the window glass, preventing heating way more than a curtain alone.
Also, if the home has several levels, open the upper floor windows more than the lower ones. Hot air expands and raises. If it has somewhere to escape it will keep the house cool and the windows will draw in wind. Wind moves faster at higher altitudes. That's why attic fans are so effective.
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
Probably not exactly the answer you're looking for.
If you have access to sun and are tech savvy, hop on Facebook market place or equivalent. You can probably get very cheap used solar panels that still have plenty of output. Rig up a AC unit in one room and cool just it.
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
Pretty good (but long) answer with historic solutions here : https://solar.lowtechmagazine.com/2025/06/dressing-and-undressing-the-home/
My short answer : do not let the sunshine in (stores, awnings, shutters), let it flow let it go (air), I like big walls and I cannot lie
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Hi there, time to share ways to keep your home cool during hot times
So ok, usual ways I use:
- open everything during night
- close everything during day
- external sheets on windows without shutters
- some curtains to prevent heat from going upstairs
I was also wondering if plants could also help inside, any ideas ?
Share your advices !
Not really a thing you can just do, but thick walls. I live in an old house with double layered exterior brick walls. It has such a massive impact that sometimes I wear a vest inside, while it's heatstroke temperatures outside.
