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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.

24 questions with no upvoted or accepted answers
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154 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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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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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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51 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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250 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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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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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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118 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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52 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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53 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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222 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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84 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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103 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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225 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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189 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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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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Air conditioner icing up; diagnostic questions

BACKGROUND AC filter was replaced (1PM) and afternoon temperatures exceeded 83 degrees (target temp). Afternoon temperatures climbed despite the AC being on 5 hours straight (4-9PM). ...
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205 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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69 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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792 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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666 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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174 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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2k views

A/C system reports Limit Switch Stuck Open

Unit is a York GM9S080B12UP11G. When switching thermostat to cool, the system activates the compressor fan. Also, I can hear gases moving through the pipes running to the compressor. However, the ...
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54 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 ...