Questions tagged [cooling]

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26 votes
8 answers
55k views

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

Summary The question pretty much says it all. It's probably a ridiculously easy one to answer. It's cool outside but I know that my house is heating up because my AC kicks on periodically. I've had ...
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  • 734
23 votes
1 answer
203k views

How do you trigger the HVAC with wiring only?

I have a HVAC that has the usually wiring C R G W Y Pinouts What wires do I need to connect to turn on Heating? What wires do I need to connect to turn on the A/C? Is there a risk of damaging any ...
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20 votes
4 answers
89k views

Why don't programmable thermostats automatically switch between "Cool" and "Heat"?

While I can set my house to be a particular temperature, I still have to manually switch it between "Heat" and "Cool" mode, and this seems to be true of every thermostat (programmable or not) that I'...
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19 votes
7 answers
7k views

Why is my house energy efficient only in winter?

My electric utility company sent me a graph of my home's electricity usage over time as shown in the picture below. My home beats what the company considers as efficient homes in the neighborhood when ...
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11 votes
8 answers
43k views

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

I live in Phoenix where summer outdoor temperatures regularly exceed 110°F and humidity around 15% or lower is not uncommon. In this environment a mist system can easily pull the temperature down ...
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  • 300
9 votes
4 answers
2k views

Heat dissipating materials for a wall that gets very hot?

The exterior wall adjoining one of our rooms gets a lot of sunlight in summer, and I suspect heats up the room a lot, as the exterior wall continues to radiate heat well after sunset during peak ...
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  • 343
9 votes
4 answers
26k views

HVAC system that pulls-in cold air from outside?

My house has an existing forced-air heating system and I'm looking at getting central AC added in a few weeks' time (indeed, I've booked contractors for estimates next week). An AC system would keep ...
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  • 274
8 votes
11 answers
27k views

How do you cool a concrete home?

I have a large backyard and it has a structure that's basically the size of a small home. It is made out of concrete blocks and cement floors. So it has poor insulation and it has a low, exposed roof. ...
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8 votes
8 answers
32k views

Should I open the top or bottom of double hung windows?

I'm a new home owner and was wondering if there is a "right" way to use the double hung windows in the house. Should I open the top or bottom? Is there a seasonality to it? Does it even matter at ...
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  • 205
7 votes
9 answers
113k views

Better to run air conditioner fan on high or low speed?

In my apartment, I have two window air conditioning units. Both have different settings for the fan speed: one has two speed options and the other has three. Both have the design that the room ...
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7 votes
1 answer
1k views

Rheem Heat Pump A/C Mode Delay Cycle In Hot Weather

I have a Rheem 15PJL48A01 heat pump which has been working correctly for years, and is maintained properly. It is hot here currently and so it is operating in cooling mode. Yesterday and today, it ...
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  • 191
6 votes
4 answers
2k views

Heating/cooling system recommendations for this small house?

I will soon build my first house and I need to choose what type of heating/cooling system I'll have installed. I know very little about this and I'm seeking recommendations, ideas, suggestions, etc. ...
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5 votes
6 answers
70k views

Does running a dehumidifier with an AC unit save money?

I've done as much research as i can an every site i hit seems to have a different story on my question: "Will a dehumidifier save energy while running your AC through the summer"? The ones that say "...
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5 votes
2 answers
771 views

CFM Required to Ventilate Room to Maintain Temperature

I am designing a computer room inside my home. The room walls are inside the house. This question excludes floor, wall, and ceiling losses/gains. I am looking for the formula to calculate the CFM ...
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5 votes
2 answers
20k views

Can I use a stairwell ceiling fan to save energy?

We have a two story house, with a small ceiling fan mounted above the main stairway. The house has separate thermostats for heating/cooling the upstairs and downstairs. During the day, we spend 90% ...
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5 votes
1 answer
4k views

A/C escaping down the staircase

I live on the second floor of a century-old house that doesn't have central air. We have a large window A/C unit in the main hall but our front door is at the bottom of the stairs rather than the top. ...
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  • 201
4 votes
6 answers
4k views

Options to cool attached sunroom

I live in the northeast US and recently bought a home with an attached solarium facing south. Roof is composed of reflective double-pane Anderson windows. Sides are nearly floor to ceiling double-...
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4 votes
4 answers
2k views

How can I add thermal mass to my house?

We're part of a real-time pricing program with our electric utility company, and a good strategy for offsetting electricity use during peak demand times is to pre-cool the house. The more thermal ...
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  • 1,341
4 votes
1 answer
2k views

Why do I have 3 HVAC professionals telling me 3 different things about heat gain/heat loss?

I sent the same set of house drawings to 3 different firms that size HVAC equipment. They each sent back signed designs. Here are the results: Firm 1: 65k BTU/h Heat Loss – 45k BTU/h Heat Gain Firm 2: ...
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  • 193
4 votes
3 answers
3k views

How can I cool down a hot garage?

My North Carolina garage is extremely hot, does not have a window and a room over top. In 5 years I have lost three freezers, there is no other place to put the freezer. I have tried to find a fan w ...
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4 votes
4 answers
51k views

Is there a window or portable AC system I can use with an awning window?

My bedroom gets ridiculously hot and I taped tin foil over the window. It didn't help much. I'm thinking of getting an air conditioner but the ledge on the window is small and the window doesn't open ...
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  • 439
4 votes
2 answers
25k views

Refrigerator big temperature difference between bottom and top shelf

I feel that my refrigerator is under-performing. I have the thermostat set to the coldest position, waited 24 hours, and with a thermometer it reads 4c on the lowest shelf, and between 8c and 9c at ...
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3 votes
3 answers
16k views

Natural ways to keep the ceiling cool during summer

I live in the single floor independent house in South India with the ceiling exposed to sun. In summer it gets really hot. I am not an expert but was wondering if there is a traditional/natural way ...
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3 votes
3 answers
15k views

How to prevent incandescent light bulbs from heating up the room, safely?

Currently I have ten 60W incandescent light bulbs heating up my room, very little ventilation, and no ideas on how to stop them from making the room so very hot. If I had other lighting option, I ...
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3 votes
3 answers
32k views

Cheapest way to heat and cool a converted garage?

I'm converting my two car garage into a home theater and was seeking some advice on the cheapest way to heat, cool, and dehumidify the room. Here are some details: Garage was once a model home office ...
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3 votes
1 answer
2k views

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

We have a Hoval UltraSource B compact C (8,11/200) air/water heat pump in our house. I have noticed in warm weather that occasionally my heat pump "blows" outside. I then thought that my ...
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  • 145
3 votes
5 answers
14k views

How can I measure the r-value of a wall?

What is a reproducible test to measure the r-value of an exterior wall? Or even a specific spot on a specific wall? It needn't produce an absolutely certain result, but a good estimate with known ...
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  • 455
3 votes
4 answers
31k views

Apartment on the top floor gets very hot - cheap, eco friendly ways to keep the place cool?

I have an apartment on the top floor of an apartment building (the community roof is right over us). In summer, the place gets very hot! I can't start a community garden upstairs and am dying with the ...
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3 votes
2 answers
3k views

What is the name of these silver curtains used to reflect heat energy back outside?

Some people use aluminum foil to reflect heat on windows but I find it very depressing and bad-looking thing. My Chinese friends use 台州涂银反光窗帘布 but I have no idea what it is in English: they translated ...
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  • 281
3 votes
2 answers
2k views

Why do air conditioners have thermostats, not humidistats?

I've noticed it over the years in various living quarters: an inside A/C temperature setting that's appropriate and comfortable for a given outside temperature is quite unbearable when the outside ...
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  • 131
3 votes
2 answers
11k views

Does keeping downstairs air off at night force the upstairs hvac to work harder?

We live in a two-story home in Florida, about 3,000 sqft. We have an HVAC for downstairs, and one for upstairs. We typically will leave downstairs pretty warm at night (~80), and when we're ready for ...
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  • 690
3 votes
1 answer
999 views

What are low-cost ways of cooling down a room? [duplicate]

How do I cool a bedroom - that has a ceiling & standing fan, but is still hot? Ideally, the cheaper the better. I live in Jamaica - where the climate is warm most of the time, and the summers ...
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3 votes
3 answers
864 views

Shading windows from outside (awnings, shutters, etc) to keep house from overheating in summer

The back of my house faces west, and during July and August, the sun hits it directly in the afternoon through evening. On a warm day, this can cause the house to heat up quite a bit, so I'm making ...
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  • 356
2 votes
3 answers
586 views

Meausure the temperature of a fridge

I have a refrigerator that is an old model (no name brand) and does not have indications of what is the actual temperature. I currently suspect that the temperature is higher than what I have set it ...
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  • 283
2 votes
4 answers
9k views

West facing master bedroom getting hot from afternoon sun

I am renting a townhouse where the master bedroom is always getting way hotter than the rest of the house. It's the only room on the top floor on the west side of the house and only has one window on ...
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  • 23
2 votes
5 answers
4k views

Can I cool my south facing wall by spraying it with water?

I've been researching options for cooling a south facing exterior wall on my house. One thing I've been thinking about is what if I just spray the wall with water and let it evaporate? The wall is ...
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  • 267
2 votes
2 answers
70 views

Curtains for a non-air-conditioned apartment in the tropics

We live in Mumbai - West coast of India, tropics. Summers are from March to July with temperatures reaching early 40 degree Celsius and a lot of humidity. It rains from July to September with ...
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  • 133
2 votes
3 answers
3k views

Will a 2-stage heat pump cool my upstairs on low stage?

I am currently upgrading my furnace from an oil furnace/AC combination to all heat pump. I am considering two stage vs single stage heat pumps. I understand that two-stage will supposedly give me ...
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  • 587
2 votes
2 answers
9k views

Why would ceiling fan reverse air flow without me changing directions?

I have this exact ceiling fan, and so far it has worked nicely. It is mounted in my bedroom, I believe height to floor is about 12 feet and the rod from the ceiling to the actual fan is about 18 ...
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2 votes
1 answer
364 views

Does leaving fridge doors open several minutes at a time lead to partial freezing of food?

I was hoping someone could help weigh in with a technical explanation here. We have a Whirlpool fridge that is only a few years old, and often notice that food near the back of it (and usually towards ...
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2 votes
2 answers
127 views

How to reduce my electric bill [closed]

Update Learned a ton about heat pumps, and wondering about Solar. Does anyone in the northeast have solar roofs? (solar shingles) I live in an all electric home (single family detached house) in New ...
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2 votes
1 answer
74 views

Sizing a window AC for bedroom, but with extenuating circumstances

I'm looking to install a window AC in my son's bedroom, which is about 120 sq ft. The guides that I'm reading suggest a 5000 BTU unit due to the size. However we live in the high desert where the ...
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  • 253
2 votes
3 answers
52 views

Premium for heatpump inverter technology

My understanding is that a variable speed compressor permits greater efficiency and reduce wear & tear. Assume application is in Florida, not NYC. Is there a range for the cost premium for such ...
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  • 2,746
2 votes
6 answers
234 views

AC Strategy for Energy Efficiency

For environmental and cost reasons, I'd like to use my AC unit less. In situations where passive cooling is not practical, I am trying to determine the most efficient way to do this. (I believe the ...
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2 votes
2 answers
110 views

Will replacing windows significantly reduce solar heat gain in summer?

A friend of mine is remodeling his 1980s house and was asking advice about keeping it cooler in the summer. The house currently has the original double pane windows, many of which have "popped&...
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2 votes
5 answers
16k views

How to diagnose and fix apartment AC that makes intermittent whooshing noise

My AC recently (I think, it's pretty new, possible I just didn't notice before) started making a whooshing noise. It sounds kind of like a sudden gust of wind, but it repeats every few seconds. ...
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  • 23
2 votes
2 answers
3k views

Can I install two thermostats on one furnace/act unit? I will be using one in living room, the other in a hallway

The reason is that there is a gas fireplace(stove) in the living room that has the pilot on all year. Currently the thermostat is in the hall keeping the back of the house cool. The heat from the ...
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2 votes
1 answer
5k views

What could cause a heat pumps line sets to be the same temperature when running?

The symptom I'm dealing with is that the heat pump system isn't cooling as much as it should. Tested it today, was about 79°F inside and outside; system was blowing air at about 73°F. ...
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  • 123
2 votes
8 answers
29k views

How do I keep my house cool especially my terrace during summer?

I live in Bangalore in an apartment on the top floor and during summer, my terrace (built of concrete) absorbs a lot of heat. When I come home and switch on the fan, it ends warming my room and it is ...
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  • 121
2 votes
2 answers
3k views

Does our main air intake need an electrostatic filter if our furnace already has one?

We have an electrostatic filter on our furnace right where in main air intake connects. We recently had our ducts cleaned and they told us we also needed to have our main air intake cleaned (an extra ...
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