Tagged Questions
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 ...
0
votes
1answer
88 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 ...
8
votes
2answers
588 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: ...
1
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 ...
1
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
504 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
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)?
3
votes
2answers
337 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 ...
-3
votes
1answer
348 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?
8
votes
1answer
147 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
2answers
916 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 ...
3
votes
1answer
158 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 ...
1
vote
2answers
354 views
Is there a filter-reminder thermostat that uses run-time instead of total time?
My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run ...
2
votes
1answer
204 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
1answer
778 views
What would cause my furnace to only work with the filter removed?
My Carrier furnace works fine without the air filter in place on the return. With the filter in place it works for a while and then stops with a complaint about "limit, or flame rollout is open" ...
2
votes
1answer
923 views
What would cause a furnace to shut off prematurely?
I've got a Carrier Weathermaker 8000 furnace that shuts off about 90 seconds or so after ignition, started doing this recently. I get flashing code "33" which indicates:
The code indicates:
33 ...
1
vote
3answers
256 views
Are 5" thick filters for furnace/Central AC still available?
My furnace/AC was installed about three years ago. It uses 16" X 25" X 5" filters. The problem is when I try to find a replacement at my local home center: at Lowe's, Home Depot, (you name it), I ...
1
vote
1answer
281 views
Furnace Airflow
I have central air. When the furnace comes on, we can feel air coming out of the registers for a few minutes, then the airflow stops. If we turn it off for a few hours, we can turn it on again and get ...
0
votes
0answers
217 views
new furnace installed - few questions
So, Sunday the fan on our 18 year old furnace died; instead of paying the $600 to get it repaired, i opted to buy a new one.
Lennox SPV98UV (i think) 98% efficient / variable speed fan. they ...
2
votes
2answers
2k views
How can I tell what kind of heating system I have?
Seems like a simple question, but I've had a very hard time finding a definitive answer to this.
I went to the hardware store to buy a replacement for a faulty thermostat and when I arrived and ...
2
votes
1answer
833 views
How do I fix a condensate drain line that froze in my split electric system with heat pump?
I have a split electric system with a heat pump. It looks like my condensate drain line is frozen. I switched to supplemental heat which does not use the heat pump. Is this enough for now? Our ...
3
votes
3answers
1k views
Why would a furnace overheat with a standard density filter?
Some time ago I found my furnace (gas, forced air, downdraft) was getting stuck on, blowing cold air. I could reset it, but it would happen again after a while.
After calling out a service man, I ...
3
votes
3answers
12k views
Why is my furnace blowing cold air?
My HEIL 7000 natural gas furnace has stopped working what are the most likely causes, and how to verify faulty parts?
Normal operation routine
Thermostat sends "need heat" signal.
Exhaust blower ...
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 ...
1
vote
2answers
146 views
How do I choose a furnace airfilter?
I have a furnace/air-conditioner that can support filters of various thicknesses: 1", 2", or 4". Filters are available in various MERV ratings. How should I decide which filter to use?
7
votes
5answers
5k views
Where should my furnace filter go in a Lennox G40UHX series furnace?
I have a Lennox G40UH(X) series furnace, which is installed in our attic (We have a single-story house on a slab). Because the furnace is installed in the attic, it is "laying down" on its side, and ...
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 ...
