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

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12 views

5 TOn Goodman packaged unit on roof turning on and off randomly

With the thermostat on cool and manual the unit (fan + compressor) will turn on sometimes right away and sometimes after hours. Then it'll run for either minutes or hours before turning off, either ...
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10 views

AC fan not turning on. It's silent

Replaced the capacitor 2 weeks ago because AC (Lennox) outside fan was not running, blowing in warm air. And the unit started working. Then again yesterday (95F outside) same thing. Replaced the ...
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2answers
480 views

Is there a way to turn on the air conditioning only on certain days?

We're looking for a way to turn on the air conditioning at our camp, say on a Thursday night, so that it will be cool when we arrive on Friday evening, but to shut it off if we don't go to the camp ...
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1answer
24 views

Closet where AC/Heater fan is located is very cold

I noticed that the closet where my heating unit/AC fan lives is super cold. I measured the temp using a black and decker IR thermal leak detector and the temp in the closet is about the same temp as ...
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1answer
26 views

Blower fan works w/ heat “auto”, not with a/c “auto” or on “on”

I've read the posts with the opposite issue, which have been helpful (you guys are amazing!) but still no solution. Problem is that the blower fan does not come on when system is on "Cool" and fan is ...
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24 views

Why would a blower motor work with A/C, but burn out with furnace?

I've gone through 2 blower motors since I purchased the home 3 yrs ago. I never have an issue with the blower when the AC runs; but it keeps dying in the winter with the furnace. I've had 2 HVAC ...
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1answer
31 views

Are my outside HVAC units and condensation drain PVC pipes set up correctly?

I'm a newbie with this stuff, but here's my situation: I have two HVAC units in my home. One sits on top of the patio and one sits on the ground. Both of them are draining condensation from the PVC ...
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2answers
49 views

Do I need an HVAC vent in this bathroom?

The finished portion of my basement was completed after the original construction. I've found a few questionable practices, including the lack of an HVAC vent in the basement bathroom (shown in green ...
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1answer
47 views

Why is there a supply vent in my unfinished basement?

Background I have an unfinished basement. It has cement floors with stone walls. The furnace is located in the basement. There is a supply vent blowing conditioned air into my basement. As far as I ...
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0answers
25 views

Why is ERV (return-return) installation not recommened?

I just had an ERV installed I was expecting the install to be return-return (ie indoor air from return duct pushed outside, and outside air pushed back into return further down the return). The ...
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3answers
52 views

Ac unit set on 74

My central air is set at 74. Yesterday and today, the house was up to 80. It has been very hot outside(90). Would this affect my ac unit?
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35 views

noisy Air-conditioner compressor

I bought a new split AC that worked great for a week or so, but now I can hear some annoying noise coming from the outdoor unit. The outdoor unit in installed on a flat roof so I can hear this noise ...
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2answers
43 views

Blower motor lost RPMs after reversal of fan direction

My air handler requires a clock wise rotation of the fan motor. After installing a new motor I found it was set in the counter clockwise position. I changed the wires (switched inline connection on ...
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0answers
10 views

How to connect honeywell wifi thermostat to trane A/C unit

My current system has 4 wires to the thermostat. I need to add the C wire for the new honeywell wifi thermostat. On the wiring board of the a/c I found 26vac on one terminal. The red wire to the ...
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6answers
644 views

Air Conditioner Can't Keep up

We just rented a condo and our A/C cannot keep up so it will run almost constantly. It can't even keep the temperature constant, it will creep up into the 80s even while running. I measured the ...
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0answers
25 views

Moved thermostat now ac wont turn on

So i was moving my thermostat to another room. I cut the wire to splice a new wire in. I got zapped first then spliced the wire. Now my thermostat is good to go but when it calls for the ac to kick on ...
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2answers
49 views

How can I wire my WIFI thermostat to control my millivolt fireplace?

I have a gas fireplace that has an millivolt on/off switch on my wall (and a remote that includes flame on/off, a countdown timer and a thermostatic flame control). I want to be able to program ...
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0answers
19 views

connecting into 24v on HVAC transformer [duplicate]

I've located available 24v to tap into on my transformer but what's the physical procedure to add my tstat wire for C?
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2answers
83 views

Do I need to level the outdoor AC cooling unit?

I've read somewhere that the outdoor AC unit needs to be leveled. My outdoor unit is a bit slanted due to the floor not being completely flat (pic below). However, I don't see any obvious structural ...
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0answers
70 views

Will a DIY Air Conditioner help my HVAC Central Air system?

So the husband and I just moved to Texas. We went away for the weekend and turned our HVAC central air from 68F and ON to 75F and AUTO. For some reason when we got home the AC wouldn't drop. Now I ...
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1answer
31 views

How can I better control temperature differences between floors in my two story home that has two HVAC systems?

We have 2600 sq ft on the main level and 800 on the 2nd floor. To the 2nd floor, there is a staircase and with a door on the bottom floor. We have our master upstairs and don't use the room at all ...
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2answers
89 views

Why “extra” power disconnect for small HVAC unit?

I am in the throes of learning enough to do a DIY install of a small heat pump package unit. The installation manual calls for (and suggests that NEC requires) a "fused disconnect" inline with the ...
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1answer
76 views

What is the best place to install an Air-conditioner in a room?

I'm trying to decide where to install my ductless split Air-Conditioner. For the indoor unit, is it ok to install it above a window? will placing the indoor unit at the corner of the wall reduce the ...
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0answers
26 views

Thermostat and thermostat system for small business with several units and tenants

Am the facilities guy in a small church and pre-school. There are 8 heat pump units through out the church/schoool. Each has a stand-alone thermostat and they are all different. I would like to get ...
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1answer
21 views

Just installed central 4 ton fau condenser and evaporator but don't know how to install thermostat from condenser to fau to the thermostat

I installed a furnace evaporator and condenser brand goodman 4 ton unit but need to know how to connect thermostat from condenser to the furnace to the thermostat if any suggestion.
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1answer
49 views

Why would my zone controller be displaying error: AC voltage insufficient?

Our AC unit was new with our house and is only 7 years old. We have a split zone system controlled by a Honeywell HZ322. Today we had no AC so I started looking at possible issues. When I got to the ...
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1answer
41 views

Window AC not cooling

I've GE window AC 0.75 ton it has stopped cooling I cleaned the nylon net properly with old tooth brush,it was totally blocked Then I combed the metallic horizontal fin like structures which were ...
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1answer
48 views

What is causing this air-conditioning unit to cool on cold days?

This is a temperature log from a reverse cycle air conditioning system that has run fine for getting on for 30 years. It has suddenly started to blast out cold air on days when it should be heating. ...
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0answers
48 views

how to install a casement window ac unit in a standard horizontal window?

Ok... I have scoured the internet. I was given 2 casement window ac units. Both of my heat pumps were stolen and this is an army wife turned widow make do type situation for while I save to replace ...
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1answer
74 views

Is installing a packaged HVAC unit (PTAC) a realistic DIY project?

I'm a handy guy and can do pretty much anything around the house that I put my mind to. Assuming I can handle the part of the install that is outside (the concrete pad, the hole in the crawlspace ...
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1answer
66 views

Issues after capacitor replaced on AC unite

Had a checkup on my AC/ furnace a couple weeks ago. The technician said the capacitor leaking oil and not pulling enough amps. He recommended me getting a whole new system. (my house built 6 yrs ago) ...
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0answers
18 views

Single Stage or 2 stage furnace

Just bought a house that has a furnace on last legs. House is 1941 masonry (Chicago). 3 floors: finished basement, first floor, 2nd floor (converted attic with vaulted ceilings and way too hot). Total ...
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1answer
51 views

How can I increase the effectiveness of the A/C in a hot 2nd floor converted attic master suite?

Just bought a 1940's masonry construction house. House has a finished basement (cold as a meat locker), first floor (comfortable) and 2nd floor (too hot). The 2nd floor is an attic that has been ...
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3answers
106 views

Do I need a neutral wire when connecting a 240V device?

So this is still not very clear to me: I am trying to get 240V to an appliance that does not need a plug (direct wiring), I won't need a neutral wire, is this right? In fact there is nowhere to ...
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2answers
114 views

No AC. I have a few HVAC troubleshooting questions

I'm having issues with my AC. Basically, the symptom is that I feel cold air coming out of the vent, but it has no pressure, almost like I have to put my hand IN THE VENT COVER to feel any cold air. ...
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1answer
73 views

ecobee3 Installation - Thermostat Y Terminal (yellow) Wire Connects to C Terminal Board

enter image description hereI'm attempting to install a new ecobee3 on an older Coleman Evcon gas furnace and AC HVAC system. The system is what I would consider typical residential as far as I can ...
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0answers
38 views

My A/C Unit stopped working after replacing blower motor

Any idea what I may have done wrong here or how to check? I replaced my blower motor (it was 100% compatible and had the proper capactitor), and upon starting it up the blower did nothing and the ...
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0answers
21 views

Should I install a doorway fan or dehumidifier?

I have central air in a rancher (one floor), and the living room is on one end of the house. That room is on a slab, and has always been noticeably hotter in the summer and colder in the winter than ...
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1answer
89 views

lennox AC condenser Fan running backwards

I have been trying to figure this out for a little while and about to check into the nutty house!! The Condenser fan went bad in my AC Unit. It was a 3 wire motor. I got a Universal replacment motor ...
2
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1answer
336 views

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on

AC unit won't turn on: both inside blower fan and outside fan unit won't turn on. It is as if I had gone to the circuit breaker and cut the power to the whole HVAC system, but I didn't. I've been ...
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0answers
23 views

Residential HVAC: one main thermostat, what do the other thermostats in the rooms do?

Are the other thermostats only meant for non-force air heat only? Does it mean only one thermostat in the house needs to have both heating and cooling, and auto or fan-only switches? It sure make ...
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2answers
220 views

WIFI thermostat no C wire

I hooked up a Honeywell WiFi thermostat last fall. There is no C wire in the furnace & the Honeywell rep suggested I wire up a small separate transformer with new wires going to the C and RC ...
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0answers
66 views

replacing single pole York A/C contactor

I am trying to replace a single pole contactor with burned contacts on York package unit Model D3YS030N064069. The old contactor has four 24 volt lugs on one side. The new contactor has 2 on each ...
2
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1answer
87 views

central a/c won't cool

My A/C unit was just checked last week- the tech said it had enough freon. Monday we had a nasty storm- electricity flickered, but never went out. After the storm, we noticed the a/c went on, but it ...
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1answer
81 views

Is my AC right-sized for my house

2 years ago I had a Bryant 2 Ton 13 Seer Air Conditioner + new furnace and coils installed in my 2800 sqft ranch style house with 6 bedrooms and 2 baths split evenly between the basement and main ...
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3answers
244 views

A/C not keeping up

So, the first warm-ish day of summer finally showed up in the Black Hills yesterday and I noticed that our central air conditioning was not really keeping up... the thermostat was set at 72, but the ...
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2answers
111 views

Is it economically reasonable to cool the roof by water evaporation

I want to estimate the outcome before going into hassle of installing the sprinklers/mist emitters. I have a place on the last floor, you can call it an attic, directly under a flat roof which is ...
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1answer
43 views

Bring HVAC Ducts to the Ground?

I'm finishing my basement. Is there any benefit to bringing the vents from the basement ceiling to the ground after I finish framing?
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2answers
61 views

Why does my furnace run periodically when the thermostat is off?

I just moved into a small apartment that has oil tank / water baseboard heaters. At first the furnace would not come on at all, after hearing the "click" in the thermostat. Maintenence was sent 3 ...
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1answer
87 views

What are the two pipes coming out of the back of my outside air conditioner?

On the back of my air conditioner there are two pipes: One is covered with insulation and one is bare pipe. What is the purpose of these pipes?