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8 votes

How to keep a small room cool using wet curtains?

I think it could work with a minor tweak. If you stick the curtain to the outside of the window and keep it wet (including the surface of the window), it will cool the glass from the outside, which in ...
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6 votes

How can I take advantage of winter cold to cool servers

That may be as easy as turning off the humidifier or blocking it from the room that the servers are in. If you've got a central heating system just blocking the vent(s) and returns for that and ...
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  • 3,755
6 votes

How much temperature reduction will I get from a green grass-covered roof?

Green roofs help reduce heat significantly. For example in this study Mean daily temperature reductions achieved were 18.0 °C at the soil surface and 27.5 °C below the module and this EPA study ...
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5 votes
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Why refrigerant cooler is more popular than evaporative cooler?

You have to also consider the climate where each type of cooler will be used and how each type of cooler works. Refrigeration coolers transfer heat from inside a building to the outside. However, the ...
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  • 3,207
5 votes

Choice between Expanded or Extruded Polystyrene Insulation Boards

This article describes the difference: EPS is formed as beads (as used in cushions) then heated and pressed together XPS is formed as a sheet or whatever final shape is desired. So EPS will break up ...
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5 votes
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How can I more effectively cool my house by managing windows with outdoor temperature changes?

Unless you can secure windows so no-one can enter the house don't compromise your safety by having windows open while no-one is at home. Open windows of a vacant house make it easier for burglars to ...
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  • 3,207
5 votes

How to keep a small room cool using wet curtains?

With the given parameters you originally gave, the idea won't work. To provide continued cooling, the water blown onto the curtains needs to be able to evaporate water. Without a substantial ongoing ...
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5 votes

What is an easy way to cool off during the summer without electricity?

I developed a simple strategy suitable for living in a flat that is not on the top floor: When you wake up, close all windows and put the blindfolds down. This allows to prevent sun rays and hot air ...
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5 votes

What is an easy way to cool off during the summer without electricity?

I am in Thailand now, it is the hottest time of year, relentless 40C and sun every day. No air conditioning. I survive by staying indoors during the hottest time of day, getting my clothes wet. ...
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4 votes

What is an easy way to cool off during the summer without electricity?

To keep body cool on hottest summer days, I use wet tee-shirt so as to mimic body's natural cooling system e.g. transpiration. Vaporisation of water really helps to feel good even under full sun. For ...
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4 votes

How can I more effectively cool my house by managing windows with outdoor temperature changes?

Fan forced ventilation systems Given the description of your situation, it may be worth investing in a controlled ventilation system. In New Zealand, these are popular where the air intake (and a ...
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4 votes
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Most sustainable way to cool a dorm-room

The best eco-friendly energy is the one you do not use. So one of the solution I propose is you heat your dorm room as little possible in order to avoid having to cool it down: Do not cook in there....
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4 votes
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What techniques or solutions are available for reducing heat absorption by walls?

A solution is to grow vegetation along your wall. Here in Europe we see some mansions with huge vines or ivy. It can be beautiful. Not sure what kind of vines you can grow in your place, but it's ...
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4 votes
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Flying vs heating and cooling

Firstly, you have to notice that heating is not optional, it's mandatory. If you leave a home unheated, the water pipes will freeze. So you could perhaps reduce half of the heating bill. Where I live, ...
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3 votes

How do I keep my room on the first floor cool all day and night?

If you can't re-insulate the whole house it might be possible to insulate just your room. Since you're already using an air conditioner the lack of effective thermal mass once you do that shouldn't ...
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  • 3,755
3 votes

How to keep a small room cool using wet curtains?

Sorry for the short answer, I can't comment yet due to reputation rules: You're also going to have to deal with the heat generated by the ceiling fan. If it's electric, then it has a motor and ...
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3 votes

How to keep a small room cool using wet curtains?

Due to your humid climate, an evaporative cooler is not likely going to be very effective. A 100% efficient evaporative cooler will only cool down to the "wet bulb" temperature: https://en.wikipedia....
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3 votes

How to keep a small room cool using wet curtains?

Evaporative coolers are common in dry hot climates. It's different from what you are proposing. It's a box on the roof that has coarse pads (commonly coir) with a small pump that keeps them wet. ...
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3 votes

Notifications for outside temperature negating need for air conditioning

Be aware it is not temperature only. If you fill the house up with water saturated air then you use electricity to condense the water out of the air when you turn the AC back on. Nominally you want ...
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  • 383
3 votes

Notifications for outside temperature negating need for air conditioning

This doesn't use a notifiction service, it just replaces a dumb system with a slightly smarter one. Ebay has lots of 20 buck gadgets that have a remote sensor and have a relay to control 5 to 15 A of ...
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3 votes
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How can I stop using HFC refrigerants?

Background Legislation mandating alternatives To control emissions of HFCs and other fluorinated gases (F-gases), Europe has two pieces of legislation: the F-gas regulation and the Mobile Air-...
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3 votes
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How to get a small volume of freezer capacity with high efficiency and low cost?

One way to increase the efficiency of an upright refrigerator or freezer is to fill up all of the "unused" airspace with something that won't flow out of the unit every time your open the ...
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3 votes
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What will happen if I leave my freezer off most of the time?

Having shut off many fridges and freezers for storage, I can tell you exactly what happens and why. It will quickly become contaminated with mold The interior of a freezer has some plastic "skin&...
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3 votes
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Effects of refrigerating vegetables that I'm supposed to freeze

Bacteria grow well at temperatures between 4 C and 60 C, generally, the warmer the better for the bacteria. Generally refrigerators are set to operate at temperatures around 4 C. Freezers operate at ...
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3 votes
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Efficiently freezing an ice pack once per 48 hours

Some years ago I read of an off-grid farmstead in Australia that used a conventional chest freezer as a refrigerator. The way he did it was to use a probe and temperature controlled relay to turn the ...
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2 votes

How can I more effectively cool my house by managing windows with outdoor temperature changes?

An interesting old book I found recently entitled "Everywoman's Home Encyclopedia" had an article about keeping homes cool in summer. Here are their basic recommendations: Whitewash roof to reflect ...
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2 votes

Is building vertically instead of horizontally in climate with large seasonal temperature changes more sustainable?

A complex question. But overall: No, it would not be more sustainable. Initially, such a design requires more materials. How much more depends upon the ratio of the wall area to the floor area. ...
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2 votes

How effective is free cooling

The effectiveness you are asking for is the end result of a heat exchanger analysis (of the level engineering schools assign in the junior year--somewhat complex). You would have to provide much more ...
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  • 213
2 votes

How do I get airflow through my building

When I was living in France a lot of the houses had a similar sort of look and layout to yours, but the doors were a lot larger, which allowed a lot more airflow to get through one we'd opened them, ...
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