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Questions tagged [central-air]

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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22 votes
4 answers
413k views

What's the most common cause of A/C refrigerant lines freezing?

I noticed my house wasn't getting under 75°F this weekend when I had the thermostat set for 70°F. Since I'd done a lot of drywall sanding inside recently, my first idea was to replace the filthy air ...
Doresoom's user avatar
  • 15.8k
2 votes
3 answers
16k 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 ...
Meringros's user avatar
  • 363
9 votes
5 answers
116k views

How much cooling can I expect from a central air conditioner?

Yesterday's high was 106.0F, low of 79.2F, full sun all day. AC set at 78F, indoor temperature reached about 85F. Today's high was 105.4F, low of 81.1F, full sun all day, now about 102 at 7pm. AC ...
retracile's user avatar
  • 689
4 votes
2 answers
3k views

Rust on outdoor ac fan motor? Tech recommends replacement?

I had my annual ac inspection. House has two units and one runs about twice as long each day as the other because it cools much more of the house, and had its capacitor fail two years ago. Tech ...
aggieNick02's user avatar
4 votes
4 answers
1k views

Air conditioning on a shoestring budget

Without purchasing expensive air-con units, or solar panels - and the associated moutings and electrical paraphernalia, is it possible to create a temperature difference of 10-20 °C using materials ...
qftme's user avatar
  • 141
3 votes
5 answers
3k 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 ...
blu's user avatar
  • 131
2 votes
1 answer
215 views

Tolerance for LRA and other settings on my AC unit from those on the nameplate?

tl;dr - How close to the compressor LRA / RLA and fan motor FLA should the meter readings be compared to the values on the plate? Do you also need to consider if multiple readings are off or too far ...
HelpEric's user avatar
  • 633
9 votes
7 answers
221k views

Should I insulate air conditioner coolant pipes?

I recently replaced some rotted insulation on the coolant pipe that runs out of my AC unit and into the evaporator in my house. When cleaning inside the actual AC unit itself I noticed that the ...
Jared's user avatar
  • 444
5 votes
1 answer
10k views

How can I replace the plywood under my air handler?

Sunday morning I walked out into my garage to find two huge water spots in the ceiling. The condensate drain line that comes out of my air handler in the attic had clogged up, and it turns out the ...
Doresoom's user avatar
  • 15.8k
5 votes
2 answers
9k views

Is there any reason to not tape this vent over?

I just want to make sure this wont hurt anything. Right before I bought this house, it got a new AC and furnace but they did not replace much of the duct work. This vent is right above the AC unit ...
zk.'s user avatar
  • 433
4 votes
2 answers
5k views

Should I move the furnace upstairs to help cool the 2nd story?

My wife and I live in a two story, 1400 sqft home. Recently, our 24 year old HVAC system died on us and we've been recommended by three different independent repair guys to replace the system rather ...
Kyle Hayes's user avatar
4 votes
2 answers
5k views

HVAC is suddenly blowing room temperature air—compressor, fan still turn on

I intend to call a repair person, but I just want to make I've exhausted possibilities that don't involve messing with the refrigerant lines. The A/C was working yesterday with no problems (outdoor ...
Tahlor's user avatar
  • 187
3 votes
3 answers
37k views

How do I eliminate stagnant water caused by central A/C draining outside?

So I just moved into a new house in NC that I am renting. The house has central A/C which is great, but because there is no basement so there is no basement drain. So the A/C expels the water into the ...
Justin C's user avatar
  • 133
3 votes
2 answers
331 views

Central A/C system: compressor froze, refrigerant lines sweating through insulation, outside fan won't shut off

The story We noticed the outdoor AC unit was running (i.e., fan was spinning) nonstop for > 18 hours and was relatively louder than usual -- there is now a humming vibration that can be heard ...
theforestecologist's user avatar
2 votes
1 answer
5k views

How do I fix a loud intake vent?

In the master bedroom, there is one of four intake vents in the house, and this particular one is very loud. Our house has two vertical air shafts that run parallel to each other, one for supply and ...
Proxy303's user avatar
  • 594
1 vote
2 answers
73 views

Determine specs / part info for AC contactor?

I recently asked a question about my AC unit not working properly, and I determined it's a faulty contactor. However, I cannot figure out what replacement contactor to get. The unit is 30 years old, ...
theforestecologist's user avatar
1 vote
2 answers
521 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 ...
vlr's user avatar
  • 151
1 vote
1 answer
1k 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 ...
Jonathan's user avatar
  • 297
0 votes
1 answer
956 views

How can I make a finished attic cooler and all bedrooms comfortable when central A/C is shared between 2nd and 3rd floors?

I have a 3-floor house with central air. First floor has its own A/C. Second floor and finished attic are a single zone. There is an open staircase between the first and second floors, and a ...
jay613's user avatar
  • 40.7k