For general questions regarding cooling your home.

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2
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3answers
9k views

If my air conditioner return line iced over and the fan stopped, is it broken?

We've lived in our house for three summers and have never had any problems with the air conditioner. Today I noticed that there was ice on the coolant return line outside the house. I didn't think ...
2
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2answers
2k views

How do I clean an AC condensate pan?

I have a Ducane HVAC system that started leaking out of the evaporator coil housing. Mine looks like the EU1P. I read that i need to clean out the drip pan. II tried cleaning it by sucking out the ...
2
votes
1answer
5k views

How should I evaluate my central A/C to see if it's working properly?

I was once told by a service tech that they evaluate how well the system is performing based on temperature difference between the the return and supply sides. On our first really warm day (80F+), I ...
2
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3answers
9k views

What to do about different rooms in the house being a completely different temperature?

I moved into a 30 year old home last December. There is a problem with the HVAC. I have included a very crude drawing of the floor plan The problem is that I can't maintain a comfortable ...
2
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2answers
2k views

What can cause an A/C to freeze up

Our A/C evaporator coil freeze up last year, so I called out a technician. He said that it was charged with the proper amount of Freon, and my problem [paraphrased] "something had narrowed the inside ...
2
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2answers
366 views

How can I prevent my clothes dryer door from fogging up?

When I turn the air conditioning on in my house, the inside of the window in the clothes dryer door fogs up. Also, if clothes are left in the dryer, they become slightly damp again. How can I prevent ...
2
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2answers
506 views

How can I add ventilation to my room?

My room is 3×5 meters, it doesn't have a ventilation pipe connected to it, so the air becomes close very fast, and to freshen up the room I have to open the window, and it makes my room very cold. ...
2
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6answers
24k views

What could be causing an A/C blower motor to turn off randomly?

The Blower motor on my AC unit turns off at random times while the outside unit continues to run which is causing the coil to freeze up. The blower won't come on for 30-45 minutes after the AC has ...
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3answers
3k views

How can I improve hvac air flow to my attic?

Two years ago I converted the attic of my 1.5 story house into a livable space. It had no HVAC ducts going up, so I ran some coming from the basement where the furnace is. Air flow to the attic via ...
2
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1answer
584 views

How can I extend this concrete pad?

So the wedge shaped concrete pad thats right up against the house; April 17th, we're having air conditioning installed before it gets to hot out. According to the installer, the unit will fit on the ...
2
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1answer
145 views

When I set the thermostat to X degrees, is that the temperature at which air is pushed out through the vents?

My hunch is that most ac units aren't that sophisticated, and they just pump air that is "cold enough" or "hot enough" and pump it until temperature rises to the specified value. Is that right?
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1answer
2k views

Is it normal for A/C performance to improve when vent covers are removed?

I recently moved my office to the second floor of our home and I haven't been able to get the temperature below about 78 even though the thermostat is on 72. My son's bedroom had been the same way ...
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5answers
1k views

How long does it take to make money back on a new air conditioner?

I have a townhouse built in 1975 with an air conditioner on the roof. I have no idea how old it is but I can imagine it is on it's last legs. What's more, this last month's energy bill was one of our ...
2
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2answers
735 views

What is a safe maximum temperature for an unused part of the house?

We barely use our upstairs so I don't really care how hot it gets. Except, I don't want to cause damage to the house. Considering Texas summers are easily in the 110s °F nowadays, how high can I ...
2
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2answers
189 views

Are there optimal positions for A/C and heat register grills to be facing?

I noticed a while ago that some of my A/C and heat register grills are facing the walls and not the room (the insides of the curves on the grills face the walls) in some rooms but not in others. My ...
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2answers
70 views

Emerson Liebert Air Conditioner Fan Runs Abnormal

We have 2 Emerson Liebert air conditioners inside a datacenter. Issue is not a home issue but devices are all same and I supposed finding some expert here. Here is the thing: This 2 devices are ...
2
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2answers
110 views

Combining Air Conditioner with Air Purifier

I have a small 5th floor flat, with high ceilings. The sash windows, which are tall, face south. There is a very busy road underneath the windows. Two rooms have these windows. It's noticeable that I ...
2
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2answers
3k views

What type of air conditioner can bring in outside air?

Car air conditioners usually have the option to choose circulate on/off. What about house air conditioners? For instance, does a window air conditioner exchange air inside and outside the house?
2
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1answer
437 views

What is involved in sizing and designing ducts and ductwork?

I have a one-story house, and it looks like it would be easy to run new ducts myself in the attic. What should I know before trying to design a duct system myself? I have seen ductwork that's metal ...
2
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1answer
184 views

How do I properly size an air conditioner for a very sunny room?

I'm trying to size a window air conditioner for a room, but having trouble deciding if the usual guidelines are a good fit. The room in question is about 230 sq. feet, and does not have full 8 foot ...
2
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1answer
2k views

How can I prevent heat loss through heater/air conditioner wall units?

HVAC experts out there... I live in Wisconsin and it gets mighty cold here! I have a condo with 2 wall units that are used for both air conditioning and heat. My heat bill in the cold winter months ...
2
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2answers
133 views

Is a combined AC/Dehumidifer unit more efficient than separate units?

I've just moved into a "basement-ish" apartment; the actual ground level is about at my waist. It's a bit mustier than I'd hoped, and not as cool as I'd like during these closing days of Summer. I'm ...
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3answers
1k views

Vented vs unvented crawl space

I've asked this question before: Vented vs unvented crawl space However, now that I'm going to get air conditioning the question comes back again and again people seem to have different opinions. ...
2
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1answer
82 views

What is the best place to install an Air-conditioner in a room?

I'm trying to decide where to install my ductless split Air-Conditioner. For the indoor unit, is it ok to install it above a window? will placing the indoor unit at the corner of the wall reduce the ...
2
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1answer
365 views

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on. It is as if I had gone to the circuit breaker and cut the power to the whole HVAC system, but I didn't. I've been ...
2
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1answer
200 views

The reliability of inverter air conditioners in humid climates with salty sea air

I'm considering buying a new split unit air conditioner for my home. Actually, this will be for a room that is planned as a short-term rental. I'm located in Bombay, India, now referred to as Mumbai. ...
2
votes
1answer
67 views

How can I install a window air conditioner and still allow the window to be opened?

I want to install a window based air conditioner but still allow for the ability to open the window when needed. I was thinking of using a piece of wood screwed into the window frame to support the ...
2
votes
1answer
47 views

Why does my air conditioner say not to shut it off and restart within 3 minutes?

My air conditioner says not to turn it off and then back on within 3 minutes. Why is that, and what will happen if I do?
2
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8answers
6k 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 ...
2
votes
1answer
509 views

How do I convert an A/C window unit from thermostat to humidistat control?

I've managed to get my hands on a really nice window unit AC that can cool my entire living space (about 900 sq ft), but the downside of it being so powerful is that I either have to leave it ...
2
votes
1answer
2k views

Is it possible to control the speed of the fan on my central A/C unit?

I have one of those medium sized AC-units (don't know the model name at the moment) and a very basic Honeywell thermostat that the installers put in when the house was built. However, there doesn't ...
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0answers
237 views

Why does my outdoor AC unit make a screeching sound when it shuts off?

MY AC cools just fine. But when it cuts off, the loud screeching sound outside can be heard from far away. This only happens when the AC goes off. There are no other weird sounds, any other time. ...
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0answers
33 views

Air conditioned made a sound while running and stopped working

Air conditioned made a sound while running and stopped working,I guess its probably short circuited.How can I repair it by myself? What all tools do I need?
2
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1answer
136 views

AC not cooling using heat pump

I just bought a house and this is my first experience with using a heat pump. I have put in several hours of research and understand how it works but I need someone that has experience to give me some ...
2
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0answers
83 views

Dust reduction and removal?

I have a room with west facing windows (I dont think the direction bears any importance to this question), but for some reason this room seems to accumulate dust on surfaces a lot faster than other ...
2
votes
1answer
202 views

Is my Heat pump and gas furnace installation incorrect?

I moved into a house about 2.5 years ago, and the previous owners had a heat pump installed, together with a gas furnace. Recently I had my furnace repaired (faulty igniter) and the HVAC technician ...
2
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0answers
302 views

How can I insulate and elevate an A/C line set on a flat rubber roof?

The Scenario An apartment building with a flat black rubber roof. The A/C condenser is on a platform on the roof with an air handler inside the unit. The line set runs across the roof for about 20 ...
2
votes
3answers
21k views

How can I install a window air conditioner in a metal window frame?

I'm trying to install a window unit air conditioner, but most of the installation instructions don't seem to work with this window configuration. A little bit about the setup: The apartment is the ...
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2answers
18k views

Why do the evaporator and suction lines freeze when there is low refrigerant?

In an AC, why does a low refrigerant condition cause the evaporator, and/or suction line, to freeze up?
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2answers
1k views

Is there a filter-reminder thermostat that uses run-time instead of total time?

My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run ...
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3answers
261 views

A/C not keeping up

So, the first warm-ish day of summer finally showed up in the Black Hills yesterday and I noticed that our central air conditioning was not really keeping up... the thermostat was set at 72, but the ...
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3answers
259 views

A/c makes the lights turn on and off! No Joke!

The lights on the first floor, upstairs bathroom and upstairs Laundry room won't work. The breakers did NOT pop The air conditioning was running this morning but is not working now. When the ...
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1answer
4k views

Is it possible to use my window A/C unit without actually installing it in the wall?

So, here's the dilemma. I want to install a window unit in my garage. I know how to do this, but my wife isn't supportive of the idea because we are trying to sell the house currently. Anyways, ...
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2answers
4k views

Is my window air conditioner cooling properly?

I am renting a place where the only air conditioner is a window unit mounted in the wall in the main living area. The space in that main room is about 325 sq ft, and it has a 9 ft ceiling on average. ...
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1answer
83 views

How to estimate if an old AC is worth replacing?

Have a window AC unit that's from 2001, here are the specs: Manufacturer: Kenmore VOLTS: 115 Cooling BTU/HR: 12500 Cooling AMPS: 11.6 Cooling WATTS: 1275 Cooling EER: 9.8 The average electricity ...
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1answer
1k views

A/C Condensation from duct getting into drywall

My A/C unit has ducts that run to the second floor, into the attic, to feed some ceiling vents. Today, after several days of brutal humidity, I noticed paint blistering, and in one spot bursting, ...
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2answers
900 views

Is a Heat pump / AC unit considered more or less effecient in hot states?

Just learned a house we purchased has a heat pump vs a traditional heater. The heat pump / AC unit configuration outside, blower inside. We live in the phoenix AZ area, and an efficient AC unit is ...
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1answer
659 views

What to do about a gas leak on my air conditioner?

I have an air conditioner that displays an error of gas leakage on the board. What should I do? Shall I turn it off? It is dangerous?
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2answers
54 views

Compact width Window Air Conditioner

we would like to install a window air conditioner in our living room window. The window is quite narrow (18.5" wide). The room is fairly big, ~400sqft. We would like to install a 10000 BTU window AC ...
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1answer
40 views

While vacationing, is it worth augmenting AC with a dehumifier?

Per Does running a dehumidifier with an AC unit save money?, I understand that while a house is occupied, it doesn't make sense to run both an AC unit at normalish temperatures (maybe 75), and a ...