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

learn more… | top users | synonyms

1
vote
1answer
86 views

Must my new air conditioning unit be 3 feet from the wall (or positioned backward)?

My contractor installed this system yesterday, at my property: "Trane T4TTR6060C1000A RX16 5 TON XR16 A/C 16 SEER rating R410A". Everything is working fine. I just do not like aesthetically how he ...
0
votes
2answers
31 views

can I use AC top cover for Trane XR16

My contractor installed this system yesterday, at my property: "Trane T4TTR6060C1000A RX16 5 TON XR16 A/C 16 SEER rating R410A". ...
1
vote
3answers
65 views

How is the Air Conditioning wiring supposed to connect to my furnace?

My dog has chewed through my wires on my unit that turn on my fan at the ac unit. This is not the first time. Its always been an easy fix until now. He actuall pulled the wire from the unit and I ...
3
votes
1answer
109 views

Mounting a window air conditioner on top of a sliding horizontal window

I need to install a window air conditioner in my master bedroom. However, the only suitable window there is a horizontal sliding window. To complicate things more, I need to place it on top, since my ...
0
votes
2answers
52 views

reclaiming exhaust from 'on demand water heater'

Is there some way to recover the heat which is lost through the exhaust system from a 'on demand water heater' ?
1
vote
1answer
29 views

What is 3" (750Pa) wg class?

According to Sheet Metal & Air Conditioning Contractors’ National Association (SMACNA) - leakage test manual, It is not recommended that duct system constructed to 3" (750Pa) wg class or lower be ...
0
votes
0answers
9 views

Need to clean permanent air filter

How do I access the permanent filter in a RUUD product ? The model number is either UBEA-14JO5SFFAI or RCGA-24A2GG14?
1
vote
3answers
65 views

Compressor/fan stays off when cooling turned on

Before I begin, I would like to request "call a technician" suggestions to stay off. I do know a nice guy who can look it up for me, for a variety or reasons, one of which being my general history of ...
2
votes
1answer
30 views

Why doesn't AC equipment come with dehumidifier only option?

Every AC unit dehumidifies when cooling is on. I'm just wondering why dehumidification only is not an option, as is in standalone dehumidifiers? E.g. my basement stays pretty cool even in the summer ...
3
votes
2answers
125 views

What could cause my Carrier furnace fan to sometimes stop running?

I have a Carrier system: FURNACE 58UVB080; AC 24APA530, CONTROLLER SYSTXCCUIDO1-B, approximately 7 years old. New filter, impeccable condition. I was initially told by the licensed installers that ...
11
votes
5answers
16k views

How can I calculate how large an airconditioner my house needs?

I know there are a lot of possible factors that go into determining the size of the air-conditioning system a house needs. Is there a standard way of calculating what is needed, or do A/C companies ...
2
votes
3answers
107 views

Will a 2-stage heat pump cool my upstairs on low stage?

I am currently upgrading my furnace from an oil furnace/AC combination to all heat pump. I am considering two stage vs single stage heat pumps. I understand that two-stage will supposedly give me ...
0
votes
1answer
41 views

Replacement part for coal stove blower rheostat

I have an Alaskan coal stove and my blower rheostat broke this morning. I opened it up hoping to be able to fix the part instead of buying a whole new fan controller. Any motor controllers that I ...
3
votes
3answers
82 views

Duct Cleaning: Is Duct Sealer Necessary, Non-Toxic?

A professional contractor is cleaning AC Ducts, and after he scrubs the ducts, he wants to apply an acrylic duct sealer and de-odorizer. The container of the duct sealer has minimal lableing and does ...
4
votes
3answers
186 views

Why would Central AC, Fridge & Pool Pump All Fail Within 3 Days?

Could this be systemic? Something in the electrical system for instance? Or is it likely coincidental? HVAC repair says they can't find a leak but the freon is very low and was fully charged in ...
2
votes
0answers
27 views

Air handler for an AC in the attic collect about 1 cm of water in it before it is high enough to drain… problem?

My air handler in my attic won't drain water(because the hole is 1cm above the pan) until the water reaches that hole. Why is this setup this way. From what I have read, NO water should be in the ...
0
votes
1answer
51 views

Water coming down PVC pipe from ceiling to furnace

Water comes down the PVC vent pipe to my furnace and leaks out at the elbow. Water seems to come even when the furnance is turned off. I had a furnance man come out. He said there is a leak at the ...
0
votes
0answers
104 views

Swapping out Nest for Ecobee - c-wire issues

We are trying to replace our nest with an Ecobee (with remote sensor capability). We have an existing Nest thermostat which was installed on our boiler/radiator system last year. Back then, we had ...
2
votes
0answers
36 views

Should I get a single- or two-stage furnace for my three-floor brick home?

I just bought a house that has a furnace on its last legs. The house is 1941 masonry in Chicago with 3 floors: finished basement, first floor and a second floor that is a converted attic with vaulted ...
2
votes
3answers
3k views

What is going on with my central air?

I have a re-occurring issue with my central air. I have changed filters, cleaned all three intake vents and even had a serviceman out on three different occasions (two separate companies). My problem ...
2
votes
2answers
20 views

Zoned heating system very warm even without heat on upstairs?

I know heat rises, but our 1st story floorplan house gets pretty darn warm during the winter months. Other than turning on the AC or opening windows in the upper story zone, anything else that could ...
0
votes
1answer
552 views

What type of dryer best handles long exhaust vents?

I have a very long exhaust line (about 5 meters) from the dryer and have issues with moisture staying in it when I do laundry. Since the old dryer broke down, I am now shopping around for a new dryer ...
1
vote
1answer
3k views

Troubleshoot AC issue, no inside blower

I need help troubleshooting Rheem RAHE-036JAS, Armstrong G1N80AU125D20C-1, Honeywell ST9160B 1068 Board, Honeywell SV9520H 8034 Gas Valve. About a week ago, AC and Heat were working fine. After ...
2
votes
2answers
876 views

Wifi Thermostat to Reznor Garage Heater. No “C” wire connection on terminal strip

I just had a 75000 btu Reznor UDAP garage heater installed. Can I run a "C" wire for a smart thermostat if I don't have a C connection on the terminal strip? There is a C connection on the circuit ...
0
votes
0answers
9 views

Have Goodman GHM81405 gas furnace that begins to ignite and then stops

I have a Goodman GHM81405 gas furnace that begins to ignite, and then turns off after a couple of seconds. I have cleaned the ignitor but it still does the same thing.
0
votes
1answer
35 views

Does thermostat need to be grounded?

If a thermostat is connected to an air handler, which is connected to the main panel and has a ground wire, should one of the thermostat wires be connected to the ground?
1
vote
3answers
259 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. ...
1
vote
0answers
24 views

Thermostat replacement in a double wide

We have a new double wide and I want to replace the thermostat with a new programmable one. We took off the old one and it has 3 red wires, 2 yellow, 1 white and 1 green. I get the 2 red indicate a ...
2
votes
1answer
4k views

can i use an inline exhaust to vent a kitchen and bathroom?

I have 2 bathrooms and a kitchen that are currently unvented. I would like to install an inline exhaust fan to service all three. I will be putting the exhaust fan just inside a gable that will have ...
3
votes
5answers
35k views

How much less power does a three-phase air conditioning unit use than a one phase unit?

I'm planning to install a 5 ton central AC. I'm deciding between a condensing unit that runs on 220V and a costlier unit that runs on 207Y three-phase. My understanding is that three-phase motors use ...
1
vote
3answers
111 views

Leakage in my pipes, how to densify/seal?

I've never built with pipes before so maybe I'd need some general advice regarding leakage. On a specific note, I've built a system (see picture) where it leaks practically everywhere. I've sealed it ...
9
votes
6answers
1k views

What type of regular maintenance should I be doing on my central air conditioning unit?

I have not done any maintenance on my central air conditioning system since I bought my house five years ago. Everything seems to be running fine but is there some sort of maintenance I should be ...
1
vote
3answers
3k views

What could be causing this leaky evaporator problem?

My apologizes if I do not know the correct terminology for some of the parts. I will try my best though. We have a Trane A/C system that is causing us a headache. It is causing water damage in our ...
1
vote
1answer
37 views

Blower motor runs won't shut off no heat

My furnace is set at 72, my house is 64. I have no heat, and when I turn the thermostat off, it continually runs. When I'm running the air conditioner, it blows heat. What is a possible cause?
1
vote
2answers
53 views

A/C tune-up: “Condenser fan motor drawing high amperage”

A local A/C company was offering a deal on a home heating/cooling "check-up". I've never worked with this particular company before, and I've had some bad experiences in the past (different home, ...
2
votes
1answer
224 views

AC not cooling using heat pump

I just bought a house and this is my first experience with using a heat pump. I have put in several hours of research and understand how it works but I need someone that has experience to give me some ...
5
votes
2answers
11k views

Is it OK to have heating registers and returns near the ceiling?

I've got a question about a new house - a friend of my mother's is buying a new place and when she did a walkthrough (before the drywall was up), she noticed that all the heating registers and returns ...
0
votes
2answers
79 views

The house is not cooling

What would cause the outside ac motor to run than stop than start up again and continue this random stop and start cycle constantly. The house stopped cooling
1
vote
1answer
32 views

Thermal Expansion and Contraction in Two Story Townhome

I live in California in the city of Chatsworth to be exact. I live in a two story Townhome and for the most part when I sleep in my bedroom it's very quiet. Occasionally there will be nights sometimes ...
0
votes
0answers
10 views

GeneralAire 1137 & Honeywell Wi-Fi Color Touchscreen Thermostat

I have a GeneralAire 1137 power humidifier attached to my furnace. It was never wired to the humidistat it came with, basically the installer ran the wires to my bedroom next to my furnace ...
5
votes
2answers
73 views

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling?

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling? I am looking at homes to purchase in Milwaukee, WI. The home seems to have all it's ductwork above the ceiling, as ...
5
votes
2answers
5k views

How do I install a jump duct?

Our master bedroom is considerably warmer than the living/dining/kitchen area of our house, and we've been setting the thermostat quite lower than we'd like in order for the bedroom to get cool enough ...
2
votes
2answers
86 views

How can I get better HVAC airflow?

I recently purchased my house which was a new construction. Several of the vents are getting poor airflow but the installation company simply said it was normal but I suspect otherwise. I recently ...
1
vote
2answers
461 views

Smart Thermostat - No C-Wire - No Controller Board

This one seems to be a little different from previous questions on the subject. Here is the dilemma, I don't see a transformer. I have included a few pics. There are Three wire bundles. For ease ...
0
votes
0answers
32 views

Why does my furnace blower fan intermittently hesitate for a second then continue?

Recently I had my 5 year old gas furnace serviced to replace a failed exhaust fan. Ever since, when the heat blower fan runs, it hesitates (stops) for about a second, about every 30 to 60 seconds, ...
3
votes
3answers
134 views

Was this furnace installed properly?

I am looking to answer the following: Was this job done properly, and if not, then how really bad it is? And should I hire this contractor again ? Product: Ruud RGTM10ERBJS 100K BTU 95% ...
1
vote
2answers
73 views

Does my furnace's air filter do anything at all?

Our house seems very dusty. The tops of bookshelves, computer screens, etc seem to accumulate a thin film of dust just a few days after cleaning. Certain other co-inhabitants of my house have ...
0
votes
1answer
22 views

Are foam filters in return important?

I recently got all my hvac replaced, and in the returns were these black foam filters. Unfortunately, the drywallers sprayed texture all over them. I didn't have these in my old returns, but it still ...
1
vote
1answer
892 views

Will splitting a duct to extend HVAC to an addition cause problems?

I'm building a 15 x 26 addition off of current family room to use as a music room. The family room has 2 vents(registers) where the family room meets the new room, and because of convenience they ...
0
votes
1answer
4k views

Why would said gas furnace keep shutting off?

Seems that I have a gas furnace that is having some sort of heat/air sensing issue. Basically it shuts off after running for a minute or two. But if I remove the top plate of the furnace itself it ...