For questions regarding a central cooling system for your home. This is typically a split system with an outdoor compressor/condenser and an indoor evaporator and air handler. Air ducts are used to cool air throughout the home.

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High Power Bills Related to Air Conditioner

So I seem to be having trouble with my power bills (they've often been near $400 while other people in my area with a similar sized house usually get around $140), and I've isolated the issue to my ...
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1answer
34 views

My AC unit won't blow cold

So, I was changing a light switch and flipping circuit breakers to find the correct one. I accidentally flipped my AC circuit breaker off and then back on. After this I noticed the AC wasn't blowing ...
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2answers
318 views

Breaker lets more Amps then its max

The last few day's I had the main breaker triped a few times, I checked the amps with a multimeter and when the central air conditioner turns on it draws 150! amps for 1 second and then goes down to ...
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2answers
35 views

Upstairs bedrooms are too hot. Would like to put in another thermostat.

I've been searching for an answer to this question but have yet to find one that applies. I'm looking to put in a new thermostat on the 2nd floor where the bedrooms are that would take over in the ...
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1answer
35 views

Repairing Leak in Refrigerant Lines

We recently found and pinpointed a leak in my copper refrigerant line (the non-insulated line) and was wondering if there was anyway to repair and replace that one spot on the line (like if there were ...
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1answer
22 views

AC Coil Corrosion?

I looked at my outdoor AC unit yesterday and it looks like the coils are starting to deteriorate. I looked online and it looks like it's some kind of corrosion. Is this fixable at this point? Or is ...
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1answer
28 views

Does a central A/C with copper lines that are too small cause compressor and diaphragm failure?

I have a 3 ton R410A A/C unit that is 8 years old and is using copper lines that are too small. Does this cause leaks, diaphragm failure, and compressor failure? The air was not blowing cold, so I ...
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1answer
93 views

Central Air Unit not Sending Enough Power to Thermostat

Right now I don't have specifics on my central air unit (make, model, etc) but hopefully the info I provide will help. I have a Second Generation (and Third Generation) Nest Thermostat hooked up to ...
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52 views

Did I wire my Nest thermostat correctly?

I installed a Nest 3rd Gen thermostat in my house over the weekend, and am not 100% sure I did it correctly. It powers on, and air does come out, however the force of the air isn't strong as it used ...
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1answer
51 views

Does it take long time to turn AC unit around?

I am wondering if it can take a full day of work to turn around AC unit like in this post . Must my new air conditioning unit be 3 feet from the wall (or positioned backward)?
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2answers
46 views

can I use AC top cover for Trane XR16

My contractor installed this system yesterday, at my property: "Trane T4TTR6060C1000A RX16 5 TON XR16 A/C 16 SEER rating R410A". https://drive.google.com/folderview?id=0B7uO-n40pIiESGJBdmhlUnFkbDQ&...
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1answer
92 views

Must my new air conditioning unit be 3 feet from the wall (or positioned backward)?

My contractor installed this system yesterday, at my property: "Trane T4TTR6060C1000A RX16 5 TON XR16 A/C 16 SEER rating R410A". Everything is working fine. I just do not like aesthetically how he ...
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12 views

AC electronic thermostat went black

I have a new (2013) Lennox AC unit. There is an electronic thermostat that just went black a few days ago. This has never happened before as, even when the AC is off for the winter, the thermostat ...
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1answer
47 views

Central Air and Hot Bedroom

We have central air in our house and with summer quickly approaching I am looking to address how hot our bedroom gets even with the AC running. We keep our bedroom door closed and I am guessing that ...
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2answers
60 views

A/C tune-up: “Condenser fan motor drawing high amperage”

A local A/C company was offering a deal on a home heating/cooling "check-up". I've never worked with this particular company before, and I've had some bad experiences in the past (different home, ...
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2answers
76 views

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling?

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling? I am looking at homes to purchase in Milwaukee, WI. The home seems to have all it's ductwork above the ceiling, as ...
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2answers
110 views

Continued Excessive dust in home air

I'm having minor breathing issues and suspect the home air quality, which seems to be excessively full of particles/dust. The air quality is visually noticeable daily, regardless of basic cleaning/...
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1answer
81 views

open cinder block wall in basement

I am replacing some framing and sheet rock that has been contaminated by mice. The basement has cinder block walls that come up about half way for some reason. The house was built in the 1950s. In ...
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11 views

Eubanks 9 SEER air conditioning max circuit breaker size

Can a 50 amp breaker be used with a Eubanks 9 SEER air conditioning unit. We cannot read the plaque information. I bought the property and that is what is currently installed. It's an older unit ...
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0answers
45 views

Home still heating after unit is off

My wife and I just purchased our first house and we're having an issue with the house getting too warm. We usually set the thermostat to 65 while we're sleeping when the unit reaches that temp it does ...
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1answer
84 views

Should I add a return or another supply to a large room with only one supply?

I just moved into a new house and I have that one room that always seems to be hot. It's on the 2nd floor of the house with the attic over it. The other 2 rooms on the 2nd floor are always a nice ...
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2answers
179 views

Issues after capacitor replaced on AC unit

Had a checkup on my AC/ furnace a couple weeks ago. The technician said the capacitor leaking oil and not pulling enough amps. He recommended me getting a whole new system. (My house was built 6 yrs ...
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2answers
108 views

What leaked out of small copper line when I blew a hole in on my air handler

I changed my blower motor out and in the process a wire arced out on a small copper line and blew a hole in it. What leaked out? I have since soldered up the hole and have not run the unit. I fear ...
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2answers
8k 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 ...
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1answer
357 views

Home: Using Exhaust & Circulating Fans to Improve Air Quality While Staying Cool

In the hopes of ventilating nasty odors and airborne contaminants, I recently installed the Bionaire BW2300 in one of my kitchen windows. This is the only one I have installed in my home at the moment....
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1answer
75 views

Difference in total pressure when HVAC system is on or off

This is a follow up question to one that I asked here. I am measuring the total pressure at the registers (all registers are open) with the BMP180 pressure sensor and somehow they don't change very ...
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1answer
393 views

Does an outdoor AC condenser unit (Heat Pump) require lubrication? Pic included

I have been in my house for 11 years now and every 3 or 4 years I have been taking the lid off my condenser unit and lubricating it. I just don’t know if I am even supposed to do this, but it make ...
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0answers
82 views

How to fix uneven central heating and air?

My central heating and air conditioning system does not heat my home evenly. Half of the house gets significantly warmer / cooler than the other half. I have tried adjusting the registers, but to no ...
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1answer
321 views

internal fuse on air handler blows every time it shuts off

air handler for air conditioner has worked fine since I moved into the house but this year both times the air conditioner has turned on it has not restarted. Both times so far the problem has been ...
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0answers
51 views

What to look for in central air installation?

I'm having an HVAC company install a York central air unit in my house today, and I'm wondering what things I should be looking for in the quality of the installation? Existing York central heating ...
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0answers
80 views

Why does the A/C come on downstairs when heat is on?

I just moved in to a 2-story house. It is zoned upstairs and downstairs. If I turn the downstairs thermostat to OFF and the upstairs to COOL, the HVAC in the attic comes on, the outside compressor ...
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1answer
267 views

How to determine if my heating & cooling system is adequate for my home?

Is there some kind of calculation I can follow to determine if the heating and cooling system in my home is rated (adequate) for the size of the house? I assume there is some way to say something ...
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172 views

Buying used heat pump/AC

I'm planning to buy and install a used heat pump/AC at some point in the near future (probably looking for sellers on Craigslist or similar), and want to know what I should look for to know if the ...
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2answers
524 views

What is the smell coming through my HVAC system?

If I leave the furnace fan always running for an extended period of time (to circulate and filter the air), when the central AC turns on there is a not-so-fresh smell that is emitted through the vents....
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1answer
95 views

Is this HVAC capacitor dead?

HVAC system stopped blowing cold air today. Last time it did this, we gave it a 2-3 hour break, in case it was over-heated, and it came back. Today, same deal, but no cold air after a few hours. I ...
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1answer
177 views

What is causing my AC to trip the breaker after running for about an hour?

After I turn on my ac, about an hour or two later it will make a noise and trip the breaker. Could this be a short in my fan motor? The fan does run.
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1answer
1k views

Central Air duct does not blow

We moved into a new house last year, the central A/C works great for all the rooms (even for closet) but we have a problem in just one room. There is almost no air flow coming from that room's air ...
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1answer
286 views

Replace reusable air filter with disposable, when no size matches?

My friend's house has HVAC whose air filter is a rectangular metal frame filled with washable fiber mesh. It doesn't look like it could catch fine particles. We wanted to try an off-the-shelf ...
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2answers
1k views

How do I interpret a central air conditioner label?

The label on my central air conditioner looks a lot like this one (photo below). What do the two numbers (separated by a slash) mean for voltage and the three amperage ratings?
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1answer
327 views

Central air conditioner grounding wire size difference

I disconnected the central air conditioner long ago during the initial phase of my home renovation. I am preparing to hook it up again and have a technician come out to look at it. The original wire ...
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1answer
2k views

Air Conditioner woes: water pooling in basement, condensation on ducts, frost on outdoor copper pipe

Can someone help diagnose what's wrong with my air conditioner? The symptoms are: the air that it is blowing is not very cold It's colder than the ambient air, but not cold enough to cool the ...
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2answers
361 views

What size A/C unit should I install?

currently using a Goodman 24000 BTU Central air, installed in '96. it is starting to cost too much because of leakage of refrigerant. I did the size calculator thing and it recommends a 30000 BTU unit,...
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2answers
13k 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 ...
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0answers
183 views

How to insulate this portion of split AC Pipe?

I bought a new Hitachi split AC lately which isn't cooling as much I was expecting. I checked for leaks/bad installation and found this. (This is connection point of external pipe and pipe which ...
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1answer
101 views

Central air compressor fan reflects sunlight into house. What can I do about it?

I have a new construction and for whatever reason the HVAC installers placed the compressor right in front of a bedroom window. I don't have any complaints about the noise (it is actually pretty ...
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1answer
9k views

What causes a HVAC control transformer to overheat?

I recently replaced my 24 volt HVAC control transformer. The outside unit started up including the air handler and ran for maybe 10 minutes. After the units shut down I noticed that the transformer ...
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4answers
30k 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 ...
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2answers
6k views

New Central Air Install: choosing single-stage vs dual-stage condensers

Specifically: would a 2-stage 3-ton condenser be more efficient than a 1-stage 2-ton condenser? Let's assume the same SEER rating for both. What about reliability? - I heard that 2-stage are a lot ...
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115 views

Are wall air vents a potential problem?

A house I'm looking at has A/C vents in the walls, rather than in the ceiling or floor. I've never lived in a house with air ducts in the walls. Can I expect to have problems? The house was built in ...
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2answers
3k 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 ...