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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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1answer
160 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
25k 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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2answers
47 views

How to deal with water damage from backed up AC drain

We have a central air conditioning unit that has one part of the unit in a closet. The blower connected to the ductworks and coils in this part of the unit, while outside there is a compressor and ...
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1answer
335 views

My AC and Heat systems are separate, Can I wire one or both fan(only) controls to my thermostat?

My house used to have just Forced Air heat, but a year and a half ago, I had central air installed. When it was installed I had questions about the wiring they weren't addressed to my satisfaction. ...
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1answer
132 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
1k 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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1answer
918 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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1answer
1k 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
43k views

When should HVAC returns be opened and closed?

My Pennsylvania house was built in the early 90s, has central heat (natural gas) and central A/C, and most rooms have pairs of closable air returns on the wall near the floor and ceiling. I've been ...
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3answers
6k views

What could be causing this leaky evaporator problem?

My apologizes if I do not know the correct terminology for some of the parts. I will try my best though. We have a Trane A/C system that is causing us a headache. It is causing water damage in our ...
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1answer
2k views

Why is my outdoor air conditioner unit making a screeching/squeeling sound?

During the winter time when I have my heat on, my outdoor air conditioner unit randomly makes this awful-sounding squealing/screeching sound. It lasts for about 15-30 seconds at a time, stops, and ...
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1answer
727 views

Furnace Airflow

I have central air. When the furnace comes on, we can feel air coming out of the registers for a few minutes, then the airflow stops. If we turn it off for a few hours, we can turn it on again and get ...
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1answer
68 views

Why does my thermostat show code 'PF' after running the fan or A/C?

After running either just the central HVAC fan, or the central HVAC AC for just a few minutes, the Bryant thermostat (Model TSTATBBPB101, C Wire attached) screen momentarily shows "PF", and then goes ...
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2answers
56 views

Considering portable a/c vs our old Central Air, from 1992, in 2 story, 2300 square foot house, High Desert

I'm in the high desert of Southern California. We're in a 2300 sq foot home, 2 stories with 3 bedrooms and 1 master bedroom on second story. The house is cooled by 2 central air systems, manufactured ...
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1answer
33 views

How often to change Aprilaire AC Filter

I have a AprilAire #2210 Air Filtration system connected to my central AC unit in the attic (https://www.aprilaire.com/whole-house-products/air-purifiers/model-2210). I am trying to figure out how ...
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3answers
751 views

A/C circuit breaker blowing after 15 minutes of runtime

20 year old Amana 3.5 ton runs for 15 minutes and then blow circuit breaker on the main panel in the house. Condenser fans running compressor is running sweating making cold air. Help. EDIT Two ...
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2answers
5k views

Basement Humidity Increases When Central A/C is Running

With regards to humidity, I seem to have the opposite intended effect in my basement when my central A/C is running... I live in Maryland and have a 1960s Cape Cod style home with an unfinished ...
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1answer
310 views

Blower shut off but the AC unit ran for 20-30 minutes afterward

Last night I turned my AC down a couple degrees before going to bed. The AC was running at the time, so when I set the temp below the current temp, the blower turned off. After getting in bed, however,...
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1answer
492 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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2answers
144 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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1answer
905 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
727 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
5k 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 house ...
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3answers
15k 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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0answers
164 views

Changing AC Fan Motor/Capacitor with No Luck

Issues with a central AC unit: Turned it on and heard a buzzing sound, but the fan didn't start. Started by looking at the dual capacitor. We happen to have two identical units, so I tried the ...
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0answers
3k views

Carrier Infinity System says “System Malfunction”

On this, the day temperatures reached 95, my AC stopped working. Here are the symptoms: The thermostat says "Infinity System - System Malfunction Call Technician". The condenser outside is spinning, ...
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3answers
2k views

Why doesn't my air conditioner's drip pan drain properly?

My AC Unit in my attic is roughly 10 years old, still heats/cools exactly as it should, but I noticed yesterday that the drip pan is overflowing. What do I need to do to get the drip pan to drain? ...
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0answers
44 views

The A/C thermosat screen is blank . What can I do before calling an HVAC technician?

My A/C unit is completely separate from the heater with a different thermosat. The A/C thermosat needed new batteries. I put in new batteries and nothing the screen is blank so I changed the batteries ...
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0answers
52 views

Convert 2 individual single stage systems into 1 2-stage zoned system - does it make sense?

My home is 3600 sq/ft, 2-story brick house in Houston, TX. Currently I have 2 single stage 10-seer Trane units with a 100K BTU furnace with 4-ton blower in each: one for upstairs and one downstairs....
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3answers
298 views

blower motor only starts after I turn power to it off and back on

So I have a brand new inside blower motor and capacitor in my HVAC system. However I am experiencing this undesirable behavior where occasionally it (the blower) won't come on. The rest of the system ...
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1answer
251 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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2answers
75 views

Why is the paint around my ceiling air vent discolored?

What is this pattern of discoloration around my ceiling AC supply vent, and how can I stop it from happening again if I repaint? Background: In September 2016, I had an air conditioning system ...
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4answers
15k views

How do I eliminate the cold drafts coming from my air conditioning vents during winter?

I have a forced hot water (baseboard) heating system in my home and added central air conditioning about 10 years ago. The cooling system's air handler is in my attic, and duct work was added for the ...
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2answers
79 views

Adding a return vent to a hot office

I have an office with a significant amount of computer equipment in it that generates quite a bit of heat and is regularly 3-12 degrees warmer than the rest of the house when I'm working in there with ...
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3answers
171 views

Can a homeowner perform regular maintenance to prevent their HVAC system from leaking refrigerant?

Raise your hand if you A) own a home or property with an HVAC system, and B) have ever had a HVAC service person recharge your refrigerant due to a leak? I see everyone's hand is raised. Okay, maybe ...
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2answers
116 views

AC smells horrible - Clorox in the drain tube fixes it temp

I moved into a upstairs apartment- studio 425 sq feet. The building is a 2 story building. It was built in 1971. There is a horrible foul smell from my central AC. When it is not running and with ...
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3answers
80 views

Compatible HVAC filter

I need to replace the filter in my HVAC system. What I found at the air handler in the attic is shown in the picture. It says Aprilaire Model 2200 media air cleaner. My questions are: Is it the ...
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1answer
87 views

Central air conditioning system isn't working

Ok, so I have done all the research I can and nothing is working. About 3 weeks ago my A/C was running fine nice and cold no issues. Came home to a house that was 97 degrees inside and started ...
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1answer
148 views

HVAC supply and return preferred locations

Is there a reason some HVAC supply and returns are low to the floor in the wall ( or in the floor ) vs in the ceiling other than keeping the ceiling clean looking? I've heard different opinions.
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1answer
39 views

External Air Conditioner Condenser Capacitor replacement

I have a couple of questions about testing and replacing the capacitor on my home heat pump external condenser unit. 1. How can I reliably test the capacitor (what tools do I need?) 2. What safety ...
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2answers
62 views

Are air vents in a house intended to let some air through when they're closed? Would it be bad to completely seal it?

I would like to be able to use the vents in my house in a way that targets specific rooms/areas more than others. Sometimes I want to completely close off a room from being temperature-regulated by ...
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1answer
1k 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
154 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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1answer
315 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
3k 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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1answer
77 views

Return plenum too big for air handler?

I am currently in the process of changing the air handler and heat pump in my house. I am working with a friend's father who does HVAC for a living. He came over and looked at my HVAC system and gave ...
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2answers
87 views

Why would my HVAC blower motor stop working after 10 minutes of runtime

my 2 year old unit it freezing after it’s been running about 10 minutes. I turned the unit off all last night. This morning I took a look at it outside, then went back in, turned it on, sat by the ...
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1answer
32 views

Condensation/moisture on AC Unit

Is there any particular reason why there is so much moisture/condensation coming from this AC unit? Added context: it rained the entire day before this photo was taken, but the unit is located ...
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2answers
41 views

Air Conditioner question

Is it typical for 1 of the (pipe) lines from my outdoor AC unit to have condensation? The AC tech added 1Ib of freon yesterday. Don't know if this has anything to do with the condensation.
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1answer
161 views

Protect mini-split condenser from ocean corrosion?

I recently bought an A/C inverter and put the condenser on the roof. I live next to the ocean so if I don't do something to protect it, something in the blower will start rusting very soon. What can ...