iFixit - Answers With Device "Central Air Conditioners"

HS29-024-5P: Why did whole-house ac stop working, still blowing but not cold?

Mon, 09 Mar 2026 07:55:40 -0700

The air conditioning worked fine then suddenly yesterday it stopped being cold, but fan still works.

⟐ Answered March 09, 2026 at 7:55 MST

Central Air Conditioners: Can I replace my AC compressor with a heat pump

Thu, 08 Aug 2024 20:31:20 -0700

The compressor on my central air conditioner 3,5 ton (42) seized up and needs to be replaced. Can I replace it with a used heat pump (SearsNHP042gka1) and leave the indoor furnace alone. Both are R22 and I have spare gas.

⟐ Answered August 08, 2024 at 20:31 MST

Central Air Conditioners: Changing Refrigerant in Central Air from r22 to M099

Thu, 21 Dec 2023 16:40:45 -0700

My plumber has been trying to sell me a whole new HVACstating that r22 has become to expensive and hard to get. But after a little research I found a supposed replacement refrigerant

DuPont

Isceon MO99

Looks like 25 lbs will run about $220.00 + $39.00 shipping on Amazon.

Then all you do is recover the r22 from the current system, check the seals and replace the gas. The law says this must be done by a licensed professional and that is fine. He then has a lot of r22 he can sell to someone else.

I also know that if I know what the problem is and the solution, I protect myself from service professionals that may want to sell you something you don’t really need.

My immediate question is how do I find out or calculate just how much gas my system needs?

@ladytech @oldturkey03 do you know anything about this. It could be a very important answer for lots of homes and a whole lot of $?

⟐ Edited December 21, 2023 at 16:40 MST

Central Air Conditioners: Where is the 2nd capacitor in my AC unit?

Thu, 21 Dec 2023 16:40:20 -0700

I bought a spare motor run capacitor for my ac unit - it is found inside the service panel. It’s an American Standard, model 4TTX6060E1000AA. From the wiring diagram I found on line, I know there is a second capacitor. It will presumably be for the fan? Can anyone tell me where I can find it? Is it internal to the fan?

⟐ Edited December 21, 2023 at 16:40 MST

Central Air Conditioners: Tempstar AC struggles to cool.

Thu, 21 Dec 2023 16:33:48 -0700

So my Tempstar AC is going to be 19 years old this year. It kind of struggles to cool the house, but it gets the job done. Should I look for a whole new hvac unit (including heat/AC)? Or wait till this one dies on me? My house is 3200 sq ft.

⟐ Edited December 21, 2023 at 16:33 MST

Central Air Conditioners: Fan on top centrral air keeps shutting off

Tue, 06 Aug 2024 03:42:02 -0700

Central air fan keeps shutting off wht ,& what to do?

⟐ Commented August 06, 2024 at 3:42 MST