Questions tagged [furnace]

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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6
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2answers
2k views

Why can't a swamp cooler and a furnace be active at the same time?

New to living with a swamp cooler. I've been told by several sources (people and internet) that the swamp cooler and the furnace can't be on/active at the same time, and indeed my landlord switches ...
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2answers
47 views

How often should ducts / furnaces be cleaned?

Asking for a house with a dog located in Canada but any general answers would be welcomed.
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1answer
339 views

2 wire thermostat wire want to be able to select fan only

I have an older furnace with only 2 wires at the thermostat "white and red". No issues at all with my system works as should. Thermostat is new Honeywell basic model not smart. I want to ...
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0answers
15 views

Closet installation of gas boiler

We have a gas-fired steam boiler (Williamson Thermoflo GSA-150) that heats our house. We're finishing the basement and would like to close off the boiler and water heater (also gas) in a small room. ...
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3answers
5k views

Does my furnace suck air from outside?

I've tried Googling this but the stakes are quite high and I don't want to be wrong, so I'm asking here. Wildfires are raging in California where we live, and the Air Quality is nearing the 'hazardous'...
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61 views

Gas furnace only lighting two of four burners

Good morning all, Long story short I have had an issue with my furnace (a Payne PG8MA) that no one has been able to resolve for a few years. I can't remember exactly how long it has been happening, ...
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3answers
108 views

Wildfire smoke : old electronic air cleaner or normal pleated filter better?

The house we live in has an old electronic air cleaner attached to the furnance. It's a Honeywell F50E 1182. We have lots of wildfire smoke in the PNW right now and am wondering if using this system ...
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1answer
30 views

Adding C Wire as simple as C to C?

Short version: I ran a new 2-strand wire from my thermostat to the furnace/air handler unit to provide spare wires since the existing 5 wires are used up and I need a C. Is hooking up the C wire as ...
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1answer
28 views

What vent type and configuration does my furnace use?

I am trying to replace my 33 year old furnace. The brand is Carrier and model is 395BAW048095. I couldn't figure out the correct vent type and configuration (down-flow, multi-position, up-flow). I ...
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1answer
61 views

Any pros and cons on relocating register on the ceiling?

I need to relocate a Heat/AC register (Labeled 2) I am planning to move it to new location (Labeled 3), kind of in the middle of the room on the ceiling. At the same time I think I need to move the ...
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3answers
103 views

Is my furnace fresh air intake correctly installed at my apartment?

I have a furnace with an uncovered air intake. I cant imagine it is pulling very much fresh air in through the duct because it is uncovered. I am wondering, is this correct? I believe there should be ...
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2answers
63 views

How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace

We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding ...
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1answer
55 views

Is wiring supplying an integrated HVAC breaker a branch circuit or feeder?

Since this air handler / furnace has overcurrent protective devices in it, would my wiring from the panel then be a feeder or branch circuit? I kind of think it would be a feeder circuit. And that ...
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2answers
259 views

Thermostat wiring for fan only

I have a White Rogers 1E78-144. My house has heating only and no AC. https://climate.emerson.com/documents/ie78-non-programmable-thermostat-instructions-en-us-4209010.pdf The current wiring only ...
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0answers
14 views

How can I cover my wall furnace to prevent the summer heat coming through from the roof?

I live on the top floor of an older apartment building- I can feel the heat coming from the roof through my wall furnace (pilot light is off).
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58 views

HVAC blower comes on by itself. Even after I remove the thermostat wires

I have a rheem classic 90 furnace/AC. From the past one month, I am noticing that my blower fan turns on, runs for 2 mins and then turns off when thermostat is off. Also, when running the air ...
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1answer
37 views

Adjusting ECM motor air flow

I recently had the following Rheem ROCB furnance installed. https://www.rheem.com/product/ROCB-118P05-M It's paired with a Rheem 5 ton condenser for cooling. However, I feel the air flow is set way ...
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2answers
87 views

AC leaking into drip pan in the attic

I apologize in advance for this long post. This is the first summer in this home that I bought. I'm a first time homeowner. One day I realized a big stain in my ceiling right under the attic and found ...
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1answer
318 views

Can metal mesh furnace filters be replaced by paper filters?

We have a furnace that has wire mesh air filters, will it function/be safe to replace those filters with paper filters?
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1answer
50 views

connect switch handy box to plenum?

would it be code to attach the 2 x 4 handy box with the switch on the plenum as the old furnace set up would hook up on the new furnace with the bx cable coming off bottom of handy box to furnace ...
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31 views

Furnace fan operates only when heating is on

I don't have AC unit at my house, and summer heat is really bad when I sleep at night in my bedroom upstairs. Since I don't have AC, I think manually setting the fan "on" while I sleep will ...
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41 views

vinegar for Trane furnace

I installed a new gas heater with a condensing unit in 2019 winter. Here is the detail. My question is... Every year, I'd better pour some vinegar after opening the cap of the picture? If yes, how ...
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0answers
28 views

air filter location for Nordyne Furnace Model KG7SL 090D-35C

I'm trying to change and replace the air filter for my furnace. It's Nordyne Furnace Model KG7SL 090D-35C. Picture attached. However I can't figure out where the air filter is located. Can someone ...
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1answer
69 views

Does lengthy refrigerant line between indoor and outdoor unit affect AC performance and result in higher utility bill?

As part of basement renovation, I am moving the HVAC indoor unit for about 30 feet, which means the refrigerant line has to be extended by same length concealed within basement ceiling. Now, I have ...
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2answers
338 views

Why is there a musty smell from my HVAC system even after coil cleaning?

I am having trouble getting rid of a smell in my AC (installed 2016), 2 visits by an HVAC professional have resulted in no luck. Problem: There is a musty smell, from all vents, as the AC is turning ...
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1answer
155 views

Why is there condensation on a pipe near my furnace?

My AC says it is trying to cool to 73 but is reading 75. I changed the filter, which didn't help. I looked in the closet, and apparently the installers were supposed to install an "auxiliary ...
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0answers
76 views

Installing a Honeywell HZ432 for four zone wireless heating

need help with wiring setup. Current setup Gas furnace (heating, no cooling): standard four zone gas furnace setup with hot water circulator 4 zones (3 wired, 1 wireless) Setup: Honeywell THM5320R (...
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2answers
31 views

HVAC / Furnace Evaporator unit in attic leaking cold air

We have an A/C (and heat) unit in the attic with force air ducts going to the ceilings in the rooms. I was in the attic today when the A/C turned on. I felt cold air come on my leg when I was near the ...
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1answer
43 views

Why is my electric furnace warm if it isn't being used?

Our furnace has not been used as the weather has been fairly warm lately. It may have turned on for a minute the previous night, but I do not know. Anyways I was walking past furnace and noticed I ...
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1answer
17 views

Trane VX99 furnace fan to run

I would like to have the fan turn on and blow non-a/c. I only see 2 wires coming from the thermostat. In
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1answer
200 views

Furnace Short Cycling - Carrier Code 33

We have a Carrier 58STA/STX Furnace that is only short cycling in Heat and not A/C. When it cuts off it is throwing Code 33 which is pointing to the following issues: Dirty Filter or Restricted Duct ...
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0answers
43 views

Why is the combustion chamber on my furnace vibrating and humming when the air conditioner is on?

I replaced the blower motor, blower wheel (squirrel cage), and run capacitor in my Goodman GMS80904BNBB furnace (1994 model I believe) because it showed signs of bearing and capacitor failure. First ...
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4answers
2k views

Is it normal for air to be leaking from this part of the HVAC?

First time living in a house. While I was cleaning (AC was also running) I noticed that somewhat cold air leaks from the circled part of the furnace on either sides. Not sure if this this information ...
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0answers
30 views

Furnace breaker wont stay on

I tried turning on the AC and it won’t run. Checked the breaker box and the furnace breaker is flipped. The breaker won’t stay in the on position When I flip it bacm. So I must have a short ...
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1answer
2k views

Wiring for 2-stage thermostat and 2-stage furnace with single stage cooling

I got my furnace and A/C unit replaced last summer. The new furnace has 2-stage heating, the A/C unit is single stage. The installers put in a single stage thermostat, so as far as I could tell it was ...
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1answer
157 views

Run Only The furnace fan

I have an old unit that has no control board. It works with a sequencer. (Coleman 3500A816) is it possible to wire it up to to be able to call only the blower to come on and not the heat as well? !
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1answer
25 views

Recomendations or information on adding biocides in furnace pan

I have heard that it is recommended to add some amount of biocides to a furnace in order to prevent mold building up in the furnace pan. Is it common in residential buildings, or more common for ...
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1answer
91 views

High Efficiency Furnace vented through the roof. How screwed am I?

I'm investigating installing a central air system and in doing so it was brought to my attention that my high efficiency furnace may not be installed properly. I'm in a narrow semi without much ...
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0answers
13 views

Connect two LP-GAS High-Eff +95% Furnaces to one LP Tank

Connect two LP-GAS High-Eff +95% Furnaces to one LP Tank will reduce supplier refill to one location on House. Furnaces 100K BTU and 60K BTU. To reduce refill to one location (currently two tanks on ...
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215 views

Increase fan speed (wiring) on Bryant Legacy Furnace

I have a two story house. The second floor gets hot even with the AC going. Right now, with no AC running and the thermostat set to “fan on”, the blower is set up to run at low speed. Since it’s a 3 ...
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2answers
1k views

Side effects of wire mesh inside vent covers

I am considering tacking wire mesh (such as from a window screen) onto the inside of my indoor furnace/AC duct vents as well as the outdoor intake vents, for pest control. I know doing it inside the ...
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0answers
20 views

Fan Only operation not working - gas forced air furnace

So i followed online guidance to enable "fan only" mode for my forced air gas furnace, Essentially that was to connect the "G" terminals on the t-stat and the furnace board. Seems simple enough, but ...
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1answer
57 views

Both reusable and disposable furnace filter?

I recently discovered that my furnaces (Rheems) have reusable "permanent" filters, but they also have a disposable filter tray. Are they intended to both be used simultaneously, or are homeowners ...
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0answers
2k views

Thermostat not getting power (Nest E74)

I replaced an old Honeywell thermostat about a month ago with a Nest thermostat. Friday Nest started displaying an E74 error. I have two furnaces and two outdoor units, one for upstairs and for ...
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0answers
59 views

Rheem RGDG unit turns on w/thermostat off, blower come on and inducer motor switches off and on

I've having a problem with my rheem model rgdg-10nbrjr The air conditioning works, turning it on at night it blows cold air and the house indeed gets cold. However the furnace unit itself ...
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1answer
11 views

Furnace Connection Question

I recently plan to install a smart thermostat in my house and I found there is a pair of wires(black and white) were connected to the Y and B/C terminal of my furnace. I tried to track where it goes ...
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1answer
139 views

Can I Effectively Jump my Furnace Wiring for A Long Time Safely

So I live in an rental with a forced air furnace. The thermostat that controls it is an old honey well that uses ancient analog components. It works well during the winter for heating, but ...
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3answers
84 views

Furnace intake on both floors

I have a furnace located in my basement in a small enclosed room. I also have a large vent upstairs above this room in my kitchen. I always thought that the furnace takes the air from the kitchen ...
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1answer
370 views

Can I have a shared exhaust flue for a high efficiency furnace and tankless water heater?

I recently purchased and am installing a 96% efficiency two-stage gas furnace. The old unit was an 80% efficiency unit using a 4" metal flue. This flue merges the exhaust of both the hot water heater ...
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1answer
107 views

Groundwater cooled heat exchanger - forced air

I have kind of a crazy idea I have been scheming - I live in Alaska, and have a private well - the groundwater here is very cold(40-45F) or so. The last couple of summers have been miserable hot up ...

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