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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2answers
72 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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2answers
44 views

Heat pump not working after rain

A couple weeks ago, I had a Goodman 3 ton heat pump split system put in. At 5pm hours today, I was outside near the heat pump and noticed that it was functioning properly. At about 6pm, there was a ...
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1answer
1k views

What causes burn marks on the air handler in the attic?

What caused these burn marks? Phoenix Arizona suburb. House was construction complete about 6 months ago. The tape and insulating foam around the bigger tube was cut. I assume the AC tech that ...
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1answer
54 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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24 views

A/C - Repeated Freon Leaks & Run Capacitators/Fan failures

My senior citizen father has a home warranty policy. Different contractors have worked on the A/C every year since 2011. He services it in the spring and changes the filter regularly, but we live in ...
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1answer
60 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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1answer
37 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
76 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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3answers
1k views

Convert GE Load Center to main breaker

I'm looking to add central A/C to my 1970s era home. The electric panel is a GE Load Center, 125 Amp max. It's basically "full" with no space for additional breakers. The bids for the electric panel "...
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1answer
47 views

Can a roof A/C be installed on a concrete slab on the floor without being on a mounting?

An A/C company came out and replaced my A/C with a new unit a few years ago. I've had A LOT of problems with it freezing since then. I noticed a lot of mold on the bottom of the unit itself and it ...
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1answer
28 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
51 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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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
28 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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2answers
520 views

Can I just cut power to a central air and heating system, or should I follow a shutdown procedure?

I am going to install some NEST thermostats. The directions say that I should turn the system off by turning off the power to it. However, I'm worried that an abrupt power cut will be damaging. Do I ...
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1answer
110 views

How to improve heating/AC flow in second floor?

We moved into our house about a year ago and the second floor in my house never get enough heat in winter or cold AC in the summer. Our first floor can be a 72F deg while our upstair stays at nearly ...
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50 views

Heating System Premature CutOff / DIY Options?

I've collected all of the facts about my system and the problem we are seeing. We have two external air pump units outside the house and a Rheem furnace (GH36S, 36000 BTU) that appears to be working. ...
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1answer
49 views

Condenser fan quits on a Goodman heat/air unit

I have an older Goodman heat and air outside unit. I can run the heat on it for awhile, sometimes 30 minutes sometimes 40 minutes and sometimes longer, but then the condenser fan just stops but the ...
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1answer
229 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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3answers
851 views

Do you remove an AC Capacitor from the circuit before or after you short it out for safety?

Is it safe to short (discharge) an AC capacitor before you remove it from the circuit. Or do you have to wait until after you remove it from the unit?
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2answers
3k views

Should I install an air conditioner pad on existing unit?

In budgeting time and money for a house I just purchased, the inspector noted that the central air conditioner is mounted outside without a pad underneath. The unit is a Carrier 38CKC024330, ...
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1answer
201 views

Can I fix damaged AC line insulation with tape?

The foam insulation around the suction line on my ac has deteriorated, so I covered it completely with tape. Was this an OK thing to do. Am I harming anything? I have not run my AC since I did this.
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1answer
141 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 ...
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1answer
76 views

Why doesn't my home cool down when the air conditioners run?

I have two HVAC systems (2x condenser outside, 2x evap in). I just got them repaired after they started leaking two years ago (have not used it for two years). Both AC's came with the house, and I ...
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0answers
145 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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3answers
665 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
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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3answers
113 views

Help diagnose a compressor problem

My fan on my A/C compressor unit seems to start and even spins up to a reasonable speed, although not quite the speed at which it ought to spin, but then 5 seconds later slows down to a very low speed ...
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2answers
119 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 ...
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2answers
2k views

Is the transformer bad on my Central Air Conditioner?

Need some help diagnosing a problem. My very old central AC unit isn't working. It's just AC and about a year ago I connected a C-Wire to the air handler when swapping the thermostat for a wifi ...
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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, ...
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101 views

Amana Prestige Air Con fan won't spin

I have an old Amana Air Con unit that stopped working. The fan won't spin. The condenser kicks in. I can manually spin the fan and it goes like a champ. I have replaced the cap already. Any ideas or ...
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1answer
129 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 ...
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1answer
259 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 ...
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1answer
63 views

AC Capacitor Or Another Problem? (And What Type Of Capacitor?)

I'm wondering if anyone can help me identify the issue here: My AC went out. I'm positive there's a capacitor problem since I can actually kickstart the fan motor but it doesn't have any effect on ...
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1answer
141 views

How do you block cold air flow from an AC vent without blocking the vent?

From what I've read it seems that it's a bad idea to cover central air conditioning vents. So what can I do to control the cold air coming through one vent without lowering the AC for the rest of the ...
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2answers
4k 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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0answers
183 views

Connect C wire to Carrier board

I got Carrier board HK61EA010 and extra C-blue wire that is not connected to the board. I wanna use this wire to power WI-FI thermostat. I cannot find the manual for this board. Does anyone know where ...
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1answer
31 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 ...
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1answer
218 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 ...
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1answer
61 views

What are common causes of smelly HVAC?

From time to time, there's this god awful stench coming from my floor vents. It's not potent enough to where you can smell it directly at the vent, but strong enough to linger in the house and stink ...
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0answers
57 views

AC Air Intake Compartment - Is Repairing This a Reality?

I moved into a 425 sq ft apartment about a month ago. The AC had a leak for awhile. When I found it, they replaced the AC. I have had the new AC for about 2 weeks. I have a musky old wood odor in my ...
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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 ...
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2answers
110 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
74 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
115 views

Can a portable swamp cooler be hooked into a central air duct and recirculate?

I know that normally, swamp coolers take in external hot dry air, and put it out as cool wet air. I live in the hot So. Cal. desert area. A small swamp cooler is cheap to buy, but won't do my whole ...
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1answer
86 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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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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1answer
512 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-...