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68 votes
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Why is my house energy efficient only in winter?

The heating in your home is natural gas. You are not using any electricity to heat your home in the winter. Therefore, from your electric company’s perspective, you are very energy efficient in the ...
statueuphemism's user avatar
64 votes
Accepted

Why does my house heat up, even when it's cool outside?

Meet solar gain For the most vivid example of solar gain, sit in your car with everything off - A/C off, blower off, windows rolled up tight, doors shut tight. You can't. Your body will force you to ...
Harper - Reinstate Monica's user avatar
37 votes

Why does my house heat up, even when it's cool outside?

Because you have indoor heat sources There's a lot of reasons your house will get warmer than the outside temp, but this is the single largest one. The human body produces as much as 400 BTU (422 kJ) ...
Machavity's user avatar
  • 25.4k
29 votes
Accepted

Heat dissipating materials for a wall that gets very hot?

Since it's a "Heat in summer" problem, a traditional decorative and edible approach would be to train/trellis a plant or plants in front of the wall - grapes, vining tomatoes, espaliered fruit trees, ...
Ecnerwal's user avatar
  • 221k
20 votes

How do you cool a concrete home?

There are many options, but concrete is very dense and makes a great heatsink. You can try insulating and air-conditioning the inside, but this approach is costly, energy-intensive and overall ...
JS.'s user avatar
  • 548
15 votes

Ideas for cooling a small office space with direct sunlight

External shade is the most effective reasonably cheap way. Window films are also good, as are silvered black-out blinds - but then you need to turn the lights on and can't see out. On the ground floor ...
Chris H's user avatar
  • 6,871
14 votes

How do you cool a concrete home?

The first thing you should do is insulate the roof. Even just gluing sheets of Celotex or your local equivalent will make a huge difference, though installing it in a proper ceiling would be better. ...
Chris H's user avatar
  • 6,871
14 votes

Why is my house energy efficient only in winter?

Don't over think this graph. It looks like everyone in the data base has the same heating as you, gas, because if they had electric heat, the points would be much higher than 500 to 650 KWH per month. ...
JACK's user avatar
  • 82.7k
14 votes
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Weatherize old multifamily building against extreme heat

Additional blown cellulose insulation is VERY cheap and based on the pic, it should be done. I don't recommend a box fan. Increase the ventilation and use proper fans that are designed for that space. ...
UnhandledExcepSean's user avatar
14 votes

Can you use water from a municipal supply and return it for home cooling?

Congratulations! You just invented a geothermal heat pump. It's like an AC unit, but uses liquid and ground for cooling side instead of less efficient air. At this point you might as well get an ...
Thomas's user avatar
  • 250
14 votes

What can I do to cool down the room?

First of all cardboard is not a good reflective insulator. Second, hanging cardboard on the inside will not help much since the heat has already entered the room through the glass. Get some aluminum ...
Traveler's user avatar
  • 18.1k
14 votes
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Would sprayed insulation under the roof deck cool down a hot attic?

Spraying the roof deck would create an insulated box. It's difficult to predict how that would affect average interior temperature. It would certainly increase roofing temperatures, which isn't ideal. ...
isherwood's user avatar
  • 142k
13 votes

How do you cool a concrete home?

To be clear -- Concrete does not cause it to get warm. Concrete is a very good thermal buffer - it resists changes in temperature. This is a highly desirable trait in a passively heated and cooled ...
Harper - Reinstate Monica's user avatar
13 votes

Heat dissipating materials for a wall that gets very hot?

Put a false wall in front of the existing outside wall and allow air to flow between the two. That will reduce the conducted heat into the room by a huge amount.
Solar Mike's user avatar
  • 27.8k
13 votes

How should I deal with an air conditioner that doesn't keep up?

If the system is running (fan is blowing; condenser/compressor outdoors is running) then replacing the thermostat won't help any. You've done well checking the filter and ensuring the outdoor unit is ...
Greg Hill's user avatar
  • 31.6k
12 votes

Why does my house heat up, even when it's cool outside?

In addition to the other answers that address your question for the most part, there is one more possibility I can think of. It is possible that your AC is not only trying to get the inside ...
PhilippNagel's user avatar
  • 4,967
12 votes

Ideas for cooling a small office space with direct sunlight

The cheapest and easiest way to stop the sun hitting a window is to add a roller awning. Note that they don't actually need to stick out all that far in summer, when the sun is high in the sky. There'...
Robin Bennett's user avatar
11 votes

Options to cool attached sunroom

Keeping what is effectively a greenhouse cool in the summer is a heavy workload for any AC system. Your best bet is to prevent solar heat gain by blocking the light. Doing this with an opaque shade on ...
Shimon Rura's user avatar
  • 8,252
9 votes

Options to cool attached sunroom

I think you're overestimating the energy benefits you can get from window films. Those are primarily indicated to reject ultraviolet radiation that can increase fading of indoor materials. You're ...
feetwet's user avatar
  • 2,657
9 votes

Meausure the temperature of a fridge

There are special thermometers for refrigerator & freezer use. I have a Rubbermaid thermometer (amazon link) in my garage fridge compartment and another in its freezer. This showed me my freezer ...
Jeff Wheeler's user avatar
  • 3,382
9 votes
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Why do I have 3 HVAC professionals telling me 3 different things about heat gain/heat loss?

In an ideal world, the numbers would really be based on your actual house construction and detailing. In my world I have a spreadsheet that details the thermal characteristics and area of every part ...
Ecnerwal's user avatar
  • 221k
9 votes

Can you use water from a municipal supply and return it for home cooling?

No, not allowed in 3 countries I am aware of. The primary reason is controlling contamination. Then you will have to exceed the mains supply pressure - which in my country is 9 bar. At each point of ...
Solar Mike's user avatar
  • 27.8k
9 votes

Would sprayed insulation under the roof deck cool down a hot attic?

Note that there has to be airflow along most of the underside of the roof, to let the wood dry and discourage rot. There are channels you can buy to hold that space open; you would then install any ...
keshlam's user avatar
  • 31k
8 votes

Why does my house heat up, even when it's cool outside?

Because an Air Conditioner doesn't give any airflow between inside and outside. An AC is essentially a refrigerator. Inside is the conditioned space, and outside is the heat dump (i.e. the back of ...
Chris Cudmore's user avatar
8 votes
Accepted

How to fit portable air conditioner hoses through a too small wall vent

You could investigate the rectangular panel that holds the two holes in the wall. Perhaps it can be removed, then you can replace it with a new panel with a suitable hole cut out. You could search ...
jay613's user avatar
  • 41.8k
8 votes
Accepted

Why does my heat pump "blow" at warm (even hot) outdoor temperatures? Should not it be inactive?

The heat pump is also responsible for heating hot water (also a feature), is that the reason for the blowing? Yes, hot water in a the tank (which is well above ambient temperatures) will slowly cool ...
ratchet freak's user avatar
8 votes

How should I deal with an air conditioner that doesn't keep up?

It depends. If the A/C has a mechanical problem, have it fixed. You'll know soon enough, if it suddenly got worse. If the A/C is working properly and simply has never been able to adequately cool ...
Harper - Reinstate Monica's user avatar
7 votes

How can I add thermal mass to my house?

I have about 50 55-gallon drums stacked in my basement, all filled with water. They are stacked one on top of the other (bottom row/top row) along our north basement wall. I have two in floor-...
personal privacy advocate's user avatar
7 votes

Why is my house energy efficient only in winter?

As heat can travel through your walls and roof in either direction, what you should really take from what the electricity company is telling you is that your house is inefficient all the time except ...
Solar Mike's user avatar
  • 27.8k
7 votes

What can I do to cool down the room?

You need to do your best to cool the whole building overnight, then keep it cool with shade during the day. External shading of windows (and walls if not well insulated) is better than internal, but ...
Chris H's user avatar
  • 6,871

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