Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

1
vote
1answer
23k 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 ...
1
vote
1answer
115 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. ...
1
vote
1answer
124 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 ...
1
vote
2answers
768 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, ...
1
vote
1answer
907 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 ...
1
vote
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 ...
1
vote
2answers
41k 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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
1answer
721 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 ...
1
vote
2answers
47 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 ...
1
vote
1answer
25 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 ...
1
vote
3answers
326 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 ...
1
vote
2answers
3k 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 ...
1
vote
1answer
253 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,...
1
vote
1answer
408 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 ...
1
vote
2answers
134 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 ...
1
vote
1answer
882 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....
1
vote
1answer
603 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.
1
vote
1answer
4k 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 ...
1
vote
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 ...
1
vote
0answers
78 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 ...
1
vote
0answers
2k 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, ...
1
vote
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? ...
1
vote
0answers
43 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 ...
1
vote
0answers
46 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....
1
vote
3answers
232 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 ...
1
vote
1answer
219 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 ...
0
votes
3answers
14k 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 ...
0
votes
3answers
167 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 ...
0
votes
2answers
102 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 ...
0
votes
3answers
71 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 ...
0
votes
1answer
83 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 ...
0
votes
1answer
145 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.
0
votes
2answers
61 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 ...
0
votes
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 ...
0
votes
1answer
72 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)?
0
votes
1answer
301 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 ...
0
votes
2answers
2k 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 ...
0
votes
1answer
23 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 ...
0
votes
2answers
38 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.
0
votes
1answer
104 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 ...
0
votes
1answer
97 views

Condenser is always running

I recently rewired two thermostats into one Honeywell RTH9580WF1005 Wifi Thermostat. I ran a new wire and hooked up R and W to the oil boiler and Rc, C, G, and Y to the Goodman air handler. The Y is ...
0
votes
1answer
164 views

Ecobee restarts when calling AC - old analog thermostat worked

I just installed an ecobee 4 and I have a C-wire so it seemed straightforward. The ecobee shows that it detected all the expected wires. However when it tries to call the AC it instantly restarts ...
0
votes
1answer
27 views

Supports for air handler block intake

My air handler is supported by 2x4's which partially cover the filtered intake. I'd say there's 5-6" of blockage over the 21.5" filter size opening. Old air handler replaced after 12 years (due to ...
0
votes
1answer
186 views

Installing thermostat but can't disconnect power

I just bought a house, and I'm trying to save some money by doing simple projects, on my own. I just purchased a smart thermostat and I am trying to follow the directions, for installation. The ...
0
votes
1answer
74 views

Are these AC ducts beyond cleaning?

I moved into a upstairs apartment- studio 425 sq feet. The building is a 2 story building. It was built in 1971. I had a bad musky meldew smell in my apartment. My AC broke and the landlord placed a ...
0
votes
1answer
397 views

Why does my A/C “bump” and cycle super fast at night?

I've got an ancient Armstrong Concept 1000 air conditioner (it was old when we bought the house 11 years ago) hooked up to a Nest thermostat. The furnance and blower is much more modern; it's an Aire-...
0
votes
1answer
40 views

Change AC Filter size

Our central air furnace/cooler (Lennox Elite CH33-42B-2F) takes 4" filters. They can work out quite expensive, so my question is, will the system work just as well if I change to standard 1" filters, ...
0
votes
1answer
49 views

Length of insulated copper line set for a central air conditioner

How long can a insulated copper line set for a central air conditioner be outside the home? Is there any problem with it being as much as 10 ft.?