(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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1answer
33 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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19 views

Should drip pan be replaced with install of new furnace?

We just purchased our first home; part of the agreement of purchase was that the previous owners had to install a new furnace which was done by a professional installer from a reputable company in the ...
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1answer
42 views

Is it necessary to discharge the capacitors on an AC condensor?

I intend to replace the capacitors on my house air conditioner condenser. This video claims that discharging the capacitors is not necessary, because the circuitry will discharge through the fan ...
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1answer
23 views

Honeywell VR8300A3500 Single Stage Heat Gas Valve to Ecobee3 with C wire

Hey everyone have a quick question regarding a honeywell VR8300A3500 Single Stage Heat Gas Valve and the introduction of a Ecobee3 wifi enabled thermostat with a "C" wire. just want to make sure i am ...
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1answer
41 views

Water dripping out of small pvc pipe in soffit of house

Yesterday was an extremely hot day here in SoCal with temperatures around 100F. The AC unit had been turned off during the daytime and at nighttime we turned it on to cool down the house. A few ...
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1answer
29 views

A/C freezing damaged air handler blower?

While I was moving, I left my front door open for at least two hours. As a result, my coils froze up outside and inside the return and the inside handler. The vents were not putting out any air and it ...
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1answer
23 views

Air handler blower, motor, or something else?

My blower just stopped working. I have 240 volts to the motor but it won't spin. It will turn an inch or so but that's it and it tries repeatedly. Could it be something besides the blower or the motor?...
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1answer
20 views

HVAC thermostat current

What is the typical current (in mA) carried by the 24v thermostat HVAC wire bundle in a typical low voltage application? I'm using 18/7 wire.
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2answers
55 views

How to move from RH/RC thermostat to C thermostat in AC only system?

I see this is a pretty common question, but the answer seems like it might be dependent on your thermostat and air handler, so I'm posting with my specific questions. I'm upgrading from a White ...
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1answer
19 views

Moving from R22 to R410a

Outside Unit Carrier Central Air Conditioner Model 38CKC042-340 Inside Unit Carrier Furnace M/N : 58STA090-10116 I am very newb, i have no idea if there are other parts involved besides the ...
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23 views

Carrier Central Air Conditioner Model 38CKC042-340 with 35/5 instead of 40/5

I have this unit Carrier Central Air Conditioner Model 38CKC042-340 I was looking at http://www.repairclinic.com/Shop-For-Parts/a41b370d1182307/Model-38CKC042340-Carrier-Central-Air-Conditioner-...
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3answers
122 views

How to recharge a window unit air conditioner?

Can I recharge my window unit air conditioner or do I have to send it to a specialist? The AC unit that I have is about 15 years old (nothing lasts forever)... and I happen to have about 20 lbs of ...
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1answer
61 views

How long does it take to add 1 lb. of refrigerant to an air conditioning unit?

My HVAC unit was running but not cooling properly. I called an HVAC guy who came to check. He came without a scale and told me he can fill the refrigerant and tell me how much he filled by just ...
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38 views
+50

Can you increase the speed of an ECM AC blower?

I have a Trane XV95_060 for furnace and Trane XR15-018 for AC I would like to know if the speed of the blower can be adjusted (increased) Before I had a 1ton AC and that was all right for the house ...
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0answers
32 views

Window air conditioner fan slows to a stop in about 2 minutes

I just bought a window A/C unit and turned it to "low fan" setting. Within I think a few seconds after it started, I could hear it slowing down, which it continued to do until it came to stop, which ...
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1answer
34 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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1answer
13 views

Trane Air Handler GAT2A0C48S41SAA Create “C” Wire

Can someone please Tell me the Best way to Create a "C" Wire for a WiFi thermostat Honeywell Wi-Fi Smart Thermostat (RTH9580WF). I currently have a Trane thermostat TCONT602AF22MA. Please... Thanks ...
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16 views

Forced air heater filter. Pros and Cons of reusable/washable filter?

When the gas service person came by to turn on the gas after termite tenting they saw that our air intake filter for the forced air system was dirty. He offered some advice and said that there are ...
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2answers
25 views

Feasibility of replacing cracked AC condenser fan blades

A few minutes ago the fan blade in my AC condenser split down the middle. I'm assuming it's been cracked/split for a while now and it finally just gave up. It looks simple enough to replace... ...
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1answer
44 views

HVAC making sound even when off

At Thermostat Fan was on Auto Cooling was On Outside Unit was making noise. Outside Unit Fan not coming on at all Next to the compressor on the Wall there was On Off Switch, I turned off power ...
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0answers
32 views

Smart Thermostat C-Wire wrong voltage

I'm looking to upgrade the thermostats in my apartment to ones which I can control programmatically over WiFi. I opened up one of the old thermostats and discovered I have the classic "C-wire" ...
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0answers
14 views

Furnace added to second Floor

I am ripping my entire house apart and will be making almost an entire wall out of windows and doors,(glass). I will be changing all of the floor plans, (walls), so at the moment I am adding HVAC to ...
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0answers
11 views

ac unit and thermostat

I replaced the fan motor and the capicators and the thermostat but the fan still don't shut off and continues to run after the thermostat has stopped and the fan gets very hot and l have to shut it ...
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2answers
26 views

What would make my ac unit hiss

I live in a mobile home and my central ac unit starting hissing pretty loud 3 days ago and tday it is blowing only warm air. There is no water or ice inside or out. The outside unit is running but it ...
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0answers
16 views

Reducing AC vent/diffuser

I want to add some smart vents to my home control system. The thing is, the largest size that they come is 12x6, and my current ceiling vent/diffuser is 12x12. I would prefer not to have to go into ...
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1answer
76 views

Less than 24 volts on the thermostat C wire

We have a brand new air handler at work, but the thermostat is mounted on a wall next to a server/computer room which is always warmer than the rest of the office. I want to install a thermostat that ...
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0answers
25 views

Random Outages on only 5 of my breakers. Open/ Bad Neutral?

Every morning when dawn comes around (5:30 - 6:30 am) the power on 5 breakers in my house seem to kick on and off with power. The breakers are my water heater (electrical/ no gas), my a/c, my kitchen ...
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1answer
20 views

How long should a heat pump last before needing repairs?

We have a Goodman heatpump Model: SSZ140601 Model Desc.: 14 SEER HP, 5 TON Mfg Date: 6/3/2010 First of all, we did not register the unit so that cut our warranty in half. Two weeks ago, our ...
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2answers
36 views

A/C unit cycles on and off

My outside compressor / condenser is cycling on and off, even though the thermostat is calling for A/C. The blower in the house still runs, and the thermostat is working properly. ( I opened up the ...
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1answer
28 views

Does a central A/C with copper lines that are too small cause compressor and diaphragm failure?

I have a 3 ton R410A A/C unit that is 8 years old and is using copper lines that are too small. Does this cause leaks, diaphragm failure, and compressor failure? The air was not blowing cold, so I ...
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1answer
293 views

Anyway to hack a portable AC unit to cool 2 rooms [duplicate]

I am looking to take a portable AC unit and hopefully run a tube through a wall in another room while still cooling the room the unit is located. I have searched to attachments that could help but ...
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1answer
85 views

What components need to be changed when upgrading from R22 to R410a?

What equipment will change when I convert from R-22 to R-410A? I don't want to get rid of my current heater as it's a hydro-thermal unit that uses free heated/recycled hot water. Can I get away with ...
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0answers
32 views

Should I have a ceiling fan whose blades extend to the register?

Currently, the ceiling fan fixture and the 10x6 register are spaced by about 32" (~2 stud lengths). The room is about 350 sqft. Should we purchase a 70" ceiling fan so the blades extend out past the ...
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3answers
101 views

In what circumstances would an AC produce no condensate but still cool the air?

In what circumstances would an AC produce no condensate but still cool the air?
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3answers
43 views

Cooling radiators in summer?

How efficient would it be to use radiators circulating with cold water, to cool house in summer? Wondering if anyone has tried this, and how well it works? I was thinking about H/AC in general, and ...
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1answer
16 views

My home air conditioner that's inside the house, seems to be sputtering when coming on. What could this be?

My home air conditioner inside the house; when it's going thru its normal cycle of off and on, it seems to be sputtering and/or hesitating to come on. It's like or similar to a car that having a hard ...
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1answer
31 views

help with improving HVAC performance on the second floor of an old house

I'm hoping some of you can offer some advice on how best to add a second AC in our home -- or on whether we should look for a different solution. I should say upfront that I've done a lot of reading ...
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21 views

Cleaning of TempStar air conditioning parts

It's been 6 years since I bought the Tempstar 4 ton a/c. So far, it is running okay. But when the need arises, I want to be BOLO and do the repairs myself. So, how do I clean a TempStar a/c ...
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1answer
41 views

How long should it take to a 1.5 tons AC to cool down a 2000sqf house from 80F to 77F?

I know that it might depend on a lot of things like: -how air tight is the house -how old it is (insulation, windows etc) -what windows are installed -BTW I have casement window -outdoor temp (...
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1answer
24 views

Are HVAC Transformers Interchangable (if their power ratings match)

I'm troubleshooting the blower not starting in a friend's HVAC system. We think the issue is either a) a blown transformer, or b) the relay that controls the blower has blown. The next step is to ...
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28 views

Both A/C air handler and outside unit won't turn on

I went to turn on my A/C for the first time this year, and nothing happened. I checked power to both the air handler and outside unit...both at getting 220v going into the boards on each. I then ...
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1answer
26 views

Need to find control valve for damper

There is no control valve attached to this damper: so I can't turn it to open/close the duct. It's currently closed :-(. It's smooth so I haven't found anything that can even grasp onto it tightly ...
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37 views

AC is freezing after one day of full use

I had my AC unit serviced two months ago. The unit is about three years old. This week is the first week we have had it turned on all day. Last Sunday I noticed that the AC was on, but no air was ...
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1answer
41 views

Should storm windows be removed if AC will be on and windows rarely opened?

We generally run our AC most of the day. I am wondering if it is a detriment to leave the storm windows on (b/c they create a pocket of hot air) or a potential benefit (by reducing the escape of cold ...
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95 views

AC Unit does not receive 24 volts on outside unit

My outside unit does not turn on itself, but it does work. I just did a quick repair just thinking it was the capacitor and it was only 15 dollars for a new one so I changed that out and still had the ...
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1answer
23 views

HVAC compressor turns on when calling for fan only

I just moved into a new apartment with HVAC, and I'm looking to control the thermostat with a few Phidgets (I had already invested in that ecosystem, so I just needed a couple of relays). Anyway, ...