For general questions regarding cooling your home.

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2answers
327 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 ...
2
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2answers
3k views

Why is my A/C unit running when the heater runs?

So it finally got cold here in AZ. We switched our thermostat from A/C to Heat. Now for some reason when the electric heater runs, the A/C condenser unit outside kicks on too. This is our first winter ...
3
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3answers
22k views

How do I install an air conditioner on a horizontal sliding window?

There isn't a great amount of literature on this subject it seems. I have an air conditioner, the manual assumes that you have a vertical sliding window, but I have one that slides horizontal, so how ...
3
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2answers
1k views

Is there a through-the-wall A/C that works with external thermostats?

Our two-story A-frame house only has duct-work downstairs in the crawl-space, with vents in the floor. It gets quite hot upstairs during the summer, but because the square footage of the upper floor ...
6
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4answers
1k views

Why aren't Geothermal heat pumps more common?

Air conditioning and heating are major energy consumers in American buildings - commercial, residential, and industrial. I have been curious for a while as to why it isn't more common to use the ...
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3answers
2k 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 ...
3
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1answer
397 views

Will a board blocking my air conditioning break it?

I have a central air-conditioning system in my rented flat. There is on massive machine on my balcony which blows out hot air when the air-conditioning is in use. The hot air is so powerful that it ...
14
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4answers
8k 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 ...
4
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1answer
1k views

How can I prevent water from collecting near the blower fan blades of a portable air conditioner?

I have a GE portable Air Conditioner (APH10AA). It's about 10 years old (I guess; we got it used). It works good (blows cold air), but in the last year or two it's regularly been getting water ...
2
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1answer
259 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 ...
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1answer
702 views

Energy Saver on new A/C doesn't work well

I just got a GE AEW12AM window a/c and the energy saver mode doesn't work that well. I'm used to the in-wall a/c that usually run for a few minutes then turn off for ten. This GE unit seems to turn ...
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2answers
1k views

Do two 5k BTU air conditioners produce the same cooling power as one 10k BTU unit?

Could you interchange 10k BTU air conditioner with 2 5k BTU air conditioner and get the same result? Or is there a reason why buying one 10k BTU air conditioner is better than having 2 5k BTU air ...
2
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4answers
2k views

Can a portable air conditioner be used to reduce moisture in a room?

I live in a flat in an older house and I have the disadvantage of living next to an outer wall. In autums/springs there is a period when the central heating isn't turned on yet, but it's already ...
2
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1answer
4k views

How do I install an air conditioner in a larger window?

I have a brand new AC in the box which was meant for another room, but recently had a baby and her room is too hot. I want to use the AC I already purchased, but the max window width is 36" and the ...
3
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2answers
268 views

Are clogs in the AC condensate drain common in Florida?

I have a two year old central A/C unit. Every 2/3 months the unit shuts off. I called the rep/maintenance company and they have given me the following response: The cause of the issue is algae ...
3
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3answers
501 views

How do I determine if adding an air conditioner will overload a circuit?

I'm going to take advantage of some Memorial Day sales and pull the trigger on a portable AC unit for my "basement-ish" (bottom of windowsill is mid chest, rather than head height) apartment. Before ...
4
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3answers
1k views

Can I plug an air conditioner and a chest freezer into the same outlet?

I have a Gibson/Frigidaire through the wall AC unit plugged into a dedicated 3-prong outlet in my a room of my apartment. I'd like to put a chest freezer in my office for homebrewed beer. Is it safe ...
3
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2answers
502 views

How to safely install a window AC unit?

I have a standard air conditioner. I have just dropped it into the window and slammed the window closed. I am just a bit concerned that If there were high winds or an earthquake the unit could drop ...
2
votes
1answer
801 views

Why isn't my heat pump system kicking out cool air this year?

I have a Carrier heat pump/air handler system (looks pretty old) with a honeywell T-stat (looks pretty new) and I am not getting cool air. Heat worked all winter, but I have used it in at least a ...
1
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2answers
712 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 ...
3
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3answers
10k views

How much less power does a three-phase A\C unit use as apposed to a 220v unit?

I'm planning to install a 5 ton central AC. I'm deciding between a condensing unit that runs on 220V and a costlier unit that runs on 207Y three-phase. My understanding is that three-phase motors use ...
0
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1answer
404 views

How to get rid of a few mosquitoes/gnats that constantly sneak in?

I live in an older house, a duplex. I constantly see a few mosquitoes or gnats sneaking in and biting me at night. It's really annoying. It is mainly on the bottom floor, where the A/C vents go to the ...
6
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3answers
2k views

How can I determine why my A/C runs all day?

I have a Bryant AC/Furnace unit. My house is 10 years old. A heat wave hit this weekend & temps got up to 95°F outside. I had my thermostat set to 75°, and it ran all day. The ...
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1answer
145 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 ...
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0answers
148 views

What type of air conditioner to look for

I'm looking for a portable air conditioner that can be moved from room to room. But the key thing I want is one that does not use a condensation tank. I know they exist because I have seen one. It ...
1
vote
1answer
145 views

HVAC unit won't come on

This morning I noticed that my main floor wasn't cooling. I found the condensation pump full ( little giant model VCMA-15ULS ). I disconnected the hose from the unit to the pump, drained it, dumped ...
5
votes
2answers
4k views

How do I install a portable air conditioning unit in a large sliding window?

I have a large sliding window that is 53 inches top to bottom and I want to install a portable air conditioning unit. The kind that don't sit in the windows but vent to the window. The window ...
2
votes
2answers
120 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 ...
3
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1answer
381 views

How can I protect A/C condenser wires?

I bought a replacement condenser fan motor for my outdoor A/C unit. The old unit was CW direction only. This one is CW/CCW and has 4 wires stick out of the side that change direction depending on how ...
0
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0answers
537 views

A/C system reports Limit Switch Stuck Open

Unit is a York GM9S080B12UP11G. When switching thermostat to cool, the system activates the compressor fan. Also, I can hear gases moving through the pipes running to the compressor. However, the ...
2
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1answer
401 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 ...
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1answer
2k views

AC Unit Blow Warm Air Indoor But Colder Air Outdoor

I have two AC Units. One for upstairs and one for downstairs. The upstairs one works just fine but not the downstairs. So, i did a test by turning both units on and went outside to compare the two ...
2
votes
1answer
140 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?
5
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3answers
11k views

How can I stop my lights dimming when my Air Conditioning turns on?

I have no noticeable problems with my house's electricity, but when my Air Conditioner kicks in (and here in Central Texas, it kicks in year round) my lights dim for a second or so and then run ...
11
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4answers
1k views

Does building insulation wear out and have to be replaced?

First, a little back-story. I've been having trouble with the air-conditioning system in my south-Texas apartment home for almost two months so far this summer. The apartment manager has been ...
3
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1answer
276 views

Is it possible to override building-wide air-conditioning settings?

I live in an apartment building (high rise). The ac is off and they won't turn it on for another month!! Meanwhile it is 90f inside and I can't sleep!! Is it possible to overide? We do have a unit in ...
3
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1answer
295 views

What is the life expectancy of an air conditioning unit with a booster?

Over the weekend my wife and I lost our air conditioning. I called a technician out to the house and he replaced both the fan motor and the capacitor. He also had to install a booster to help get my ...
8
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4answers
344 views

Is air conditioner installation a DIY project?

We got a bargain on a brand new 6.2kw Split System Inverter Air Conditioner. The quotes we've received for installation are almost as much as the unit cost itself. Is this something I should be ...
3
votes
1answer
649 views

How do I replace an A/C diffuser attached to flex duct?

Our house has central air, with the air distributed via flex ducts around the house. On the second floor, the diffusers have baffles behind them that can be closed when the system is not in use, but ...
3
votes
1answer
144 views

How can I determine which MERV filters would be best for my air handler?

I have a Carrier 3.5 ton, 1/2HP air handler (Model Number:fc4bnf042). I have been using MERV 13 a/c filters for a few years now because my son has allergies. I recently discovered that the higher ...
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2answers
948 views

What should be cleaned or examined after an air conditioner drain pipe leak?

The other day, we found some water on the floor in our utility room. After some research and investigation, we discovered that the drain pipe from the central air unit was blocked. We were able to use ...
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1answer
703 views

What can I use to repair a crack in a plastic AC Condenser Drip pan?

I've currently got an oldish furnace (early '90s Lennox), with an A/C system. The blower motor burnt up on me last week, and I just had it replaced. It turns out that the reason for the motor going, ...
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0answers
226 views

Why does power loss leave my split/ductless AC unit inoperable for hours or days? [closed]

I've got an LG Ductless 12000 BTU unit that does the most annoying thing.. It is wired into a semi-standard (one of the prongs is sideways) 15A or 20A (can't recall) GFCI outlet inside - and if the ...
3
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2answers
1k views

Besides insulation and air conditioning unit, what else is there to check if my A/C isn't keeping me cool?

I live in an apartment home where the indoor temperature has risen to above 80 degrees Fahrenheit daily for the past two months. The outdoor temperature regularly reaches 100 degrees and the weather ...
2
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2answers
377 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 ...
6
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4answers
7k views

Turning off Air Conditioning when out of the house for extended time

Most people that live in cold climates know that you should not turn your heat off when you go away for an extended period of time. Just turn it down so the pipes don't freeze. What about the ...
11
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5answers
4k views

How can I calculate how large an airconditioner my house needs?

I know there are a lot of possible factors that go into determining the size of the air-conditioning system a house needs. Is there a standard way of calculating what is needed, or do A/C companies ...
5
votes
3answers
3k views

AC Coolant pipe has condensation and leaks inside wall

I've got an old AC unit (probably 13+ years old) that came with the house that I bought. This summer I noticed some water damage on the drywall in the basement, so I cut the damaged drywall away, and ...
1
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0answers
295 views

Where to buy plastic (temporary) air ducting in the UK?

Does anyone know somewhere (ideally online) I can buy plastic air ducting? The stuff I'm talking about is what they used on Mythbusters to make that helium 'airship'. It's just a large diameter tube ...
2
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1answer
3k views

Why is there water dripping from my ceiling AC vents?

I have a one story house with hot water heat. The house also has forced air AC ducts running from the attached garage, in the attic, down into the living room, bedrooms, and kitchen. At certain times ...