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67 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 ...
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63 votes
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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 ...
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36 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) ...
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29 votes
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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, ...
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  • 137k
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 ...
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  • 407
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. ...
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  • 3,964
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. ...
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  • 55.1k
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 ...
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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.
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  • 21.3k
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 ...
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  • 4,827
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 ...
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  • 8,017
9 votes

Does running a dehumidifier with an AC unit save money?

A dehumidifier is about the same as a window AC unit with both parts in the house, for most purposes. They draw just as much power as an A/C unit of similar size (or more if they happen to be old and ...
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  • 137k
9 votes

How do outdoor mist-cooling A\C units fare in real-world usage?

For the record, I tried it out myself. I installed the Cool-N-Save system on a 4-ton A/C unit that was scheduled to be replaced in three months. After that three month period in the middle of the ...
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  • 300
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 ...
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  • 2,519
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 ...
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  • 3,088
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 ...
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  • 137k
8 votes
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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 ...
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  • 17.8k
8 votes
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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 ...
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7 votes
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HVAC system that pulls-in cold air from outside?

There is an optional add-on part for HVAC systems called an economizer. An HVAC economizer is a dampered vent designed to save energy and give the cooling system a break. Sensors within the ...
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  • 12.8k
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-...
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7 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 ...
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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 ...
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  • 21.3k
6 votes

How do outdoor mist-cooling A\C units fare in real-world usage?

I have been experimenting with using an old mosquito misting system to mist around one of my AC condensers. It does seem to make a small difference in energy consumption and reduce register ...
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6 votes

Does running a dehumidifier with an AC unit save money?

I would say a dehumidifier would not be a more efficient choice for summer comfort than turning down the thermostat on an A/C. Sure, the delta-T across exterior walls would drop, so somewhat less heat ...
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6 votes
Accepted

Is it possible to recharge a dehumidifier

TLDR: Not just no, but heck no. Throwing good money after very bad First, electricity costs: any dehumidifier old enough to use R-22 is also super inefficient as-built: The government's Energy Star ...
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6 votes

Are air coolers as effective as air conditioners?

Those air coolers or swamp coolers as they are sometimes called, will only work in an area with very low humidity. They use what is called "evaporative cooling" to achieve a lower air ...
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  • 12.1k
6 votes
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CFM Required to Ventilate Room to Maintain Temperature

1 BTU is the amount of heat to raise 1 pound of water 1 °F (definition) Specific heat of air is 0.24 (takes 0.24 BTU to raise 1 pound of air 1 °F) A pound of air is about 13.9 cubic feet (at some ...
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  • 137k
5 votes
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West facing master bedroom getting hot from afternoon sun

Rather than go full mobile-home park and start boarding (or foiling) up the windows, they do make window film specifically for this: Gila Heat Block Film (just one example) That film might be enough ...
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  • 26.6k
5 votes
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geothermal cooling with no heat pump?

The first problem that the heat pump solves is the small differential between the ambient air temp and the temperature you'd expect to get out of such a system. Let's say your home is at 80 degrees. ...
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  • 106k
5 votes

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

There's nothing wrong with your thermal insulation design. Insulation is designed to isolate your inside temperature from the outside temperature. So your a.c. is set to 80°F (27°C), then at 3am the ...
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  • 55.1k

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