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

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HVAC Return Duct - Joist Panning alternative

Joist Panning(Lining) seems to still be popular. However, a have read in a few places that joist panning is difficult to seal and can pull air from unconditioned spaces. I am looking for an ...
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23 views

A/C unit blower motor not working all the time

Blower motor will start and stop any time it wants. Replaced motor, cleaned connections, it still gives me problems. Outside unit will stay on and shut off when it is supposed to.
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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,...
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15 views

cooling and heating

We have A RASTRA built homeuilt in 2007, we purchased two years ago. We purchased a new HVAC system, all new windows and slider, but it is still super hot in the summer and cold in the winter, ...
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1answer
22 views

Can exterior exhaust vents be stacked on top of one another?

A bathroom toilet room already has an exterior exhaust vent as seen in the pic. Is it within code and ok to install another, and identical, exhaust vent directly below the current one. The Master ...
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2answers
81 views
+50

Is it OK to have an air conditioning vent above a kitchen cabinet?

We're getting proposals to add central air conditioning to our house. We currently have no ductwork so adding ducts and vents is part of the project. One possible duct location is on the ceiling over ...
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20 views

Problem with Condensor

Something is wrong with my Lennox HVAC unit. The air handler comes on but the condensor does not. There is no sound. My condensor circuit board is flashing red and green together and at a slow pulse. ...
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1answer
45 views

Multiple C wires? [duplicate]

I recently received a wifi enabled thermostat which I thought I could install easily since I saw an unused wire (Blue) which I assumed would be the C wire behind the current thermostat. When I went ...
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1answer
31 views

HVAC Drain Pipe Broken inside Wall

Can I get to the drain pipe through the drywall inside the house? When attempting to dissemble my exterior drain pipe (lower main pipe), I broke something inside the wall and subsequently there is ...
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18 views

are these hvac wiring correct [on hold]

I have a asx16036 single stage 3 ton amana condenser and a amana capf3636b6 coil. I have a focuspro th6220D honeywell. the bottom picture letters that are blurry are CRWGY
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Suggest a Branded HVAC [closed]

I would like to buy a HVAC Please suggest me a branded hvac company form Siemens, [Honeywell], nivocs controls
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26 views

HVAC - concern with one condenser vs dual on new home AC system

I would appreciate any advice on pro/con of my situation. I'm not sure how far I want to go contesting it with my builder. Here's the issue: I have a new home under construction and the contract ...
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1answer
19 views

What is required to recharge refrigerant in a built in ICE CAP Air conditioner that cannot be moved?

My apartment has a built in air conditioner unit. The brand is ICE CAP and it doesn't look like there is any way to remove it as its built into the cabinet frame that has an external exhaust outside. ...
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I need to know how many stages is my air conditioning unit

i have an amana asx16036 outside ac unit. inside is a amana capf3636b6 coil. some websites say they are single stage and some say they are two stage with a scroll compressor. can someone help me out?
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1answer
42 views

Could recent electrical work cause lights to dim when A/C turns on?

Last week I had an electrician in to put in some new wiring; I also had an HVAC guy come do the annual maintenance on our system. Since then, the lights in our living room flicker whenever the A/C ...
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1answer
41 views

Installing an Ecobee3 - Add C Wire with PEK

I have another post with this question (Adding a C wire) but thought I'd clear up any confusion with this new post and I'm adding a diagram also. The diagram shows my current thermostat wiring and not ...
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3answers
38 views

Is it okay to use two 20x20 air filters instead of one 36x20 for my home AC?

I am replacing the air filter for the first time. I came to find out the person before just used two filters that were size 20x20 and overlapped them. The size of the actual duct is 36x20. The 36x20 ...
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0answers
13 views

Trane Weathertron Stat to Honeywell RTH2510

I have a Trane Weathertron thermostat thst I am replacing with a New Honeywell RTH2510. This is a heat pump with auxiliary electric heat. The wires on the Tran thermostat are. R, T, O, G, Y, B, X2 ...
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1answer
29 views

What kind of system carries both hot and cool water to my condominium?

I have an ancient furnace and air conditioner in my condo. Basically the building supplies water to every unit. In the winter it is warm water, the summer cool water. Every condo has a blower unit ...
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1answer
29 views

Stack Effect and an open top floor window

I have recently had an energy audit for my home and discovered a large amount of air leakage. As a result I have learned about Stack Effect, and how it impacts a home's ability to retain warm or cool ...
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7 views

HE furnace exhaust vent termination in non-freezing location

we are installing a HE 100k btu gas furnace. our contractor is installing the exhaust side vent under the cantilevered section of the house that we believe is not ok. we have a cantilevered section ...
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24 views

A/C board is bad…is this from previous poor repair?

Back in May our A/C and heat would not kick on. Tech came out and replaced the A/C fuse box and everything was fine. Last week the coils froze up (has never happened before) and tech said the board ...
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15 views

Central Air Conditioner coil cleaner

What is the best way to clean Air Conditioner could I bought two cans of web cool cleaner foamy thing http://m.homedepot.com/p/14-oz-Condenser-Coil-Cleaner-WCOIL/100351663 So I ended up using two ...
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1answer
23 views

RESIDENTIAL HEAT PUMP - HOW MANY TONS IS NEEDED?

Residential A/C unit question: What size Heat Pump is needed for a 1,924 sq.ft. home 35 miles northwest of Phoenix, Arizona? The home has 6" insulated exterior walls, stucco exterior, 10' ceilings, ...
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47 views

temperature on thermostat not going down with fan running

I just had a new ac unit installed but it does not blow cold air. the techs have checked it 5 + times and have said that all the numbers and stuff check out. so while i have it on auto fan cold, i ...
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108 views

Adding a C wire

I know this question has been asked multiple times and I'm going to try some of the methods I have read in other threads but wanted to ask this question since I didn't see anyone else's wired the way ...
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0answers
21 views

HVAC wiring White Rodgers 90-113 fan center with fan limit on RUUD gas furnace and AC

Need wiring diagram how the White Rodgers 90-113 fan center and fan limit, which are wired for heat and cooling in a gas furnace. It has following components: fan control center. fan limit. gas ...
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26 views

What caused this motor to short?

These pics are from my ECM motor in my air handler. I knew the motor was my problem when it failed a phase-resistance test between the windings. The new motor passed the test and works great. I ...
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2answers
105 views

How can I check the refrigerant level in my air conditioner?

What kind of device do I need to check the refrigerant level in my home AC? Can I buy something like Mountain MTN8205 R134a Brass Manifold Gauge Set With Couplers? Please suggest if I am on the ...
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1answer
23 views

Brown Spots Above Ceiling/Ductwork

Any idea what these spots might be? They're isolated to just one spots on my ceiling. My ductwork is right above this area. Thanks!
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0answers
23 views

ac high suction pressure 95 psi, 55 degree vsat temp.

ac,high suction pressure on trane 2.5 ton heat pump replaced reversing valve no help ,normal high pressure, super heat 12,subcooling 9 supposed to be 12,weighed r22 back in system. why high suction ...
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0answers
27 views

New AC unit - condenser line freezing up

Last summer I had my entire HVAC system replaced, outside condenser, inside coil. The old system needed to have the some coolant added each summer as there was a small leak and the lines would ...
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15 views

New thermostat wifi Honeywell need 5 wires

We purchased a new thermostat and it needs 5 wires, old one only has 4, but when we looked in furnace it has a 5th wire on a connection marked C but the bundle coming from wall behind thermostat only ...
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1answer
42 views

Can AC fan or motor be upgraded?

My AC blows cold air, so I assume my compressor outside works OK. Please correct if that's an incorrect assumption. The problem is, there is very little cold airflow that comes out of the floor ducts....
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1answer
45 views

My Air conditioner suddenly became defective after a power outage

So, these are the symptoms: 1] The big fan outside is taking a lot longer to start. 2] Within 2 minutes of start-up and cooling, it makes a growling/ rattling sound and 3] The power switch to start ...
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2answers
39 views

AC tripping power breaker

My central AC is dripping power breaker What I have checked Filters are clean I cleaned outside unit with water I put in a new capacitor It cools fine it just trips middle of night like 4am
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1answer
60 views

My master bedroom is hot! Should I install a return in my master bedroom?

Thanks for taking the time to read my question. I have a house where the master bedroom was added in during an expansion. The master sits half above unfinished basement and half above crawlspace and ...
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58 views

High Power Bills Related to Air Conditioner

So I seem to be having trouble with my power bills (they've often been near $400 while other people in my area with a similar sized house usually get around $140), and I've isolated the issue to my ...
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1answer
41 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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26 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
89 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
33 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
80 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
35 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
28 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
25 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
89 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
29 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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42 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
519 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 ...