The furnace is part of an HVAC or central heating system used to generate heat. Typically this is done with gas, a heat pump, or an electric element. For hot water and radiator based heating, use the boiler tag.
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1answer
276 views
Why is my furnace running every 7 minutes, but not heating anything?
My furnace has been running every 7 minutes for the past couple days and there has been no heating coming from our baseboard heaters. all of our thermostats are on at about 60 - 65 degrees and it is ...
1
vote
1answer
51 views
What is a quieter alternative to gas forced air heating?
My small 1BR apartment has an old gas furnace that works great, but costs my landlord too much to insure. He plans to install gas forced air, an in-unit upright furnace. I'd love to suggest a ...
2
votes
1answer
32 views
Can a non-expandable filter be used in place of an EZ flex furnace filter?
My Carrier furnace has the EZ flex filters (16x25x5). These come with the plastic end caps that fit on the expandable filters. Can a regular filter, non expandable, of the same dimensions be used as ...
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1answer
87 views
What to look for in a new furnace
I've recently been told that my furnace, which is about 20 years old, is on it's last stretch and that I should consider replacing it now rather than waiting for it to fail - potentially at a very ...
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2answers
2k views
How do I build a firewall around my furnace/water heater?
I'm in the planning stage of finishing my basement. I'd like to section off the furnace and water heater, and am assuming that I should fireproof that section of the build.
What's the best way to go ...
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votes
2answers
324 views
Why does the pilot light go out when the furnace is running?
Every time the furnace fires up, it blows out the pilot light. Sometimes it will run a full cycle and blow out when it shuts down, and sometimes it will blow out about a minute into the cycle.
We ...
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2answers
65 views
How is a high altitude natural gas burner different?
What is the difference between high altitude natural gas burner and conventional low altitude gas burner and why high altitude natural gas burner are needed?
8
votes
8answers
4k views
Do thermostat-controlled, auto-adjust HVAC vents exist?
The residential forced-air HVAC systems I have seen are controlled by a single thermostat in one room. One has to manually adjust the vents in order to adjust the temperature in other rooms. Is ...
3
votes
1answer
57 views
Why is water collecting in the base of my furnace?
I changed my filter the other day and noticed a pool of water in the bottom of the furnace, below the filter. The humidifier has been off so that's not the issue. I removed the furnace panels and see ...
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2answers
209 views
Does a whole house humidifier go on the intake or outlet of the furnace?
On what side of the furnace do I install the tank of the humidifier (the warm side or the return air side)?
8
votes
1answer
146 views
Should I relocate the HVAC unit in my attic?
I have had a couple of estimates to replace our HVAC system and one contractor says he would relocate the system to a more central location in the attic. One says there is no need to relocate. There ...
3
votes
3answers
483 views
If I turn off the breaker to the Gas furnace will the pilot light go out?
I need to turn off the breaker for the furnace but am afraid this will turn off the pilot light to my gas furnace & I don't know how to relight it. Are any special steps necessary to prevent ...
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2answers
54 views
How do I interpret my furnace clearance diagram?
My brother-in-law and I are going to be finishing my basement. We just got the permit from the building inspector. When they returned my plans there was a note that told me to make sure furnace and ...
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1answer
150 views
Why is my gas furnace blowing out cold air?
I had my heat set to 70°F all day and it was blowing out warm then out of nowhere, it started blowing out cold air for the past 3 hours. I tried turning off the furnace and turning it back on but ...
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vote
2answers
99 views
Why is my furnace blower coming on so early in the ignition process?
Alright, I installed a new furnace a few months ago and have begun to notice an issue with the blowers. When the furnace first starts up, the exhaust blower should turn on to expel gas, then the ...
3
votes
3answers
2k views
How to wire multiple thermostats
I would like to have two thermostats controlling a single furnace. However I'm not 100% sure how I would need to wire everything to achieve the correct effect.
Assuming a thermostat simply acts like ...
2
votes
2answers
134 views
Can I move my furnace room ventilation intake closer to my furnace?
I live in a 3 story townhouse with a garage in the basement. Off the side of the garage is our furnace room. The ventilation and exhaust for the furnace goes to the roof. For ventilation (air coming ...
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votes
2answers
4k views
How can I test whether my furnace issue is the limit switch or the thermostat?
I suspected this issue during the winter and confirmed it now in the summer. Regardless of the temp in my home, the blower motor runs non-stop.
In the winter this must have been causing my home to got ...
9
votes
4answers
6k views
Does lowering the blower speed of a forced-air furnace lower its efficiency?
My gas furnace has two options for the blower speed: MED, and MED-HI. It had been set on the higher speed, but that was too harsh, so I lowered it to the slower speed. Does that have any impact on the ...
8
votes
2answers
495 views
What does a Summer/Winter switch on furnace air ducts do?
On some of our furnace ducts, there is a switch/valve for Summer/Winter or S/W.
What does changing this switch/lever accomplish?
Can bad things happen if I forget to switch it?
Bonus question: ...
4
votes
1answer
135 views
How can I unbend a bent furnace filter slot?
I recently bought a new home. When going to change the furnace filter, I couldn't get the original furnace filter out of the slot at the last part of the filter (where the cardboard border is). Since ...
5
votes
6answers
1k views
What should I do with old furnace filters?
I seem to be stock piling used furnace filters, are there any uses for these things once the furnace is done with them? It seems a shame to throw them out; given that I change them once a month, ...
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0answers
85 views
Why is my furnace blowing hot air outside?
So I have been having trouble heating my home. I noticed today that there is a vent blowing hot air outside. It is not the return, chimney or venting. Any ideas other that the builder thought we ...
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0answers
66 views
How can I provide my furnace with outside combustion makeup air?
I cut a 6" opening in an insulated door into the utility room then installed a 6" metal duct with a plastic exterior vent cover. I put 6" insulated flexible duct on the interior stub and let it hang ...
4
votes
1answer
2k views
Can a washer and dryer be next to a water heater?
I have a GE gas dryer (DSXH47GGWW) that is currently next to an exterior basement wall. I'd like to move it to the opposite wall (shared with the crawl space) right next to the water heater next to ...
3
votes
2answers
2k views
How can I determine why my furnace is not blowing enough heat?
During a cold spell last week when temperatures got down to -23f (-31C) my furnace started showing issues with blowing enough air and the air was not very warm. Last winter it did not have any issues ...
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1answer
192 views
How can I stop my house from waking my wife up every day in the winter?
I'd like to preface this post with the fact that I'm a complete diy amateur. I may say stupid things, or things that make no sense. Please feel free to correct me as I'm always open to learn.
So, ...
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vote
3answers
3k views
Why is my Lennox g40uh series furnace not turning on?
I have a Lennox g40uh series furnace and it just stopped working today. I can reset the furnace and can see that on the control board both LEDs (green and red) are blinking together which indicates ...
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0answers
12 views
trying to find an online retailer that sells peerless burner logs? [closed]
Had an HVAC technician come in today who told me i need need burner logs (aka burner tubes) - those things with holes in them that the flames shoot out of in your furnace.
Googling doesnt turn up ...
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vote
0answers
151 views
What's causing my draft inducer to stay on?
I have a new, 3-year old, high-efficiency, gas furnace in my home. I recently realized that my draft inducer, which normally kicks on before the burners and before the main blower, is not stopping.
...
4
votes
3answers
496 views
What's causing the rumbling sound when my furnace kicks on?
I have a new, 3-year old, high-efficiency furnace in my home. Last year it started making a slight whining noise that was audible during the very first stage, before the blower motor started. No ...
2
votes
0answers
93 views
Are w1 and w2 both energized during a second stage heat call from the thermostat?
Short version: does two-stage thermostat always close W1 circuit when it closes W2 circuit, or they might be closed independently?
Long version:
I have two-stage furnace, currently connected to older ...
2
votes
1answer
203 views
Will I see any performance gains if I reconfigure my thermostat to control the second stage of my 2 stage furnace?
Our furnace is a two stage one that was installed last year (a Bryant 80t). When it was installed, it was installed with a thermostat for a one stage furnace. This appears to be because this model ...
4
votes
2answers
748 views
Which way does air flow into a furnace?
Which way does air typically flow in a furnace? Put another way, does the filter usually sit before the incoming cool air reaches the burners or after?
I'm trying to figure out which way the air flow ...
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votes
1answer
61 views
why does my thermopump furnace keep throwing the circuit breaker [closed]
Lately the thermo pump breaking shot down and the furnace work on the auxilary . This is very expensive in electricity. But what can cause the breaker to keep throwing the circuit?
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vote
1answer
403 views
Why does my pilot light go out continuously?
My furnace pilot light keeps going out. The furnace will come on and heat up to the degree set on my thermostat, then the pilot goes out and the furnace will not come back on. Could the thermostat be ...
5
votes
1answer
258 views
How can I avoid cold rooms due to combustion air intake?
I have a newer split level house (2006) with unfinished basement. The natural gas furnace is on the lower level in a utility room that is also laundry and bathroom. There's an enormous 8 or 10" pipe ...
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2answers
197 views
Furnace control board - interchangeable?
A few months ago, I had someone working on my outdoor a/c unit, and he accidentally shorted out the control board in the furnace (it's a Goodman gas furnace GKS91155DX). He replaced the board, and the ...
8
votes
7answers
1k views
How can I audit my furnace?
I want to keep track of when my furnace is on, with an eye to reducing how much energy I use to heat my house.
I could compare it with weather data (temperature, wind speed, precipitation).
I could ...
3
votes
4answers
217 views
Is it expensive to switch from an 80% to a 90% efficient furnace, to comply with the new mandate?
I'm told by some HVAC companies via mail flyers and websites (example) that it may be very expensive to retrofit new PVC pipes to update an 80% efficient furnace to a 90% one. Therefore, the logic ...
2
votes
4answers
3k views
How much energy will continuously running a furnace fan use?
We have a bi-level (tri-level? There's a small entry way and utility room, then an upstairs living area and master bedroom and a downstairs living area with bedrooms) in mid-Michigan.
The downstairs ...
7
votes
2answers
620 views
Should I insulate steam pipes in the basement?
I have a steam-radiator heating system. The furnace is in the (unfinished) basement, and the steam-carrying steel pipes spread out across the basement ceiling before going up into the rest of the ...
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votes
1answer
345 views
why won't my furnace turn off once it reaches the desired temperature
I have a moncrief furnace and replaced the thermostat but the furnace will not cut off once it reaches the desired temperature. What could be wrong?
2
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1answer
190 views
Furnace Draft Inducer Repair: is previously installed back plate necessary?
I'm replacing a non-functioning draft inducer on the Goodman furnace in my house (GMP075-3). The previous inducer was mounted with a sheet metal back plate between it and the wall of the furnace. ...
3
votes
2answers
877 views
Should my thermostat's blue wire be going to W2?
I've recently moved into my first house and am looking to replace the existing basic thermostat in the home. Here is a picture of how I found it wired:
Researching the wires, I've read that ...
2
votes
1answer
1k views
Why won't my Heil 7000 natural gas furnace ignite?
I have a Heil 7000 gas furnace
Model: NUGK100DH12
Serial: L933050100
When we turn it on at the thermostat, the exhaust blower will kick on. We checked to be sure the gas is reaching the unit and ...
5
votes
3answers
1k views
Do I need a rain\snow cover on this furnace vent?
Just bought a house that had a new furnace installed this summer. Vent number 1 in the image is for the furnace (2 is the water heater and 3 is sump). As you can see in the image, 2 and 3 both would ...
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0answers
163 views
Can I manually run the blower on my Lennox G12Q3 furnace?
I have a Lennox G12Q3-120-6 model furnace. Does anyone know if there's a way to manually run just the blower without heat?
There are no switches on the outside that I can see (other than the power ...
3
votes
1answer
153 views
Is it normal for air to be leaking from where the drain hose connects to the central A/C unit?
I'm trying to determine if I have a leak around my central AC unit. Basically when the unit is on, I feel cool air blowing outside the "furnace plenum" as I believe its called.
If you look at this ...
2
votes
2answers
2k views
How do I wire an old furnace motor so I can use it as a garage exhaust fan?
Since last I posted, I moved WAY south (lil warm down here) and the house I moved into was a foreclosure so a few things needed done, namely the AC and furnace. When the guy did the job he said he ...
