Questions tagged [hvac]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
142 views

What is this mysterious filter and purpose?

Behind the regular HVAC air filter and next to the duct, there is a filter area with some rough filter covering an additional smaller duct. Does anyone have any idea what it is and its purpose?
0
votes
1answer
41 views

Insulating built-in air conditioners

My apartment has Frigidaire built-in air conditioner holders. I did not buy a Frigidaire AC unit because the size needed to perfectly fit the holder was unnecessarily large (and expensive). I have a ...
0
votes
0answers
18 views

HVAC: attic heat loss

Should a ventilated attic (w. Openings in the eaves) be warm in the middle of a cold winter that has a heat pump installed as the heating system for the living area below. If it is warm does that mean ...
0
votes
2answers
35 views

4 ton air handler with 3.5 ton air conditioner

What effect will having a 3.5 ton air conditioner used with a 4 ton air handler have on the energy efficiency of the hvac system? Right now we seem to be using a lot of energy per month. The question ...
0
votes
0answers
19 views

Air return proximity to furnance

We are refinishing our basement that wasn't original conditioned. New supplies and zoning were added by a contractor. We want to add an air return in the living space by tapping into the main return ...
0
votes
0answers
15 views

Name of my central heat pump unit

This sounds crazy but i cant find out what brand central package unit i have. Ive looked everywhere on the internet.. I believe its a york , because there is a address on the bottom of this tag saìys ...
1
vote
1answer
21 views

Upgated pump for 10 zones, 3 floor house?

I currently have a tanco (I don't have the current model # now) in a 5 zone 2 story house. I was recommended to upgrade to a tanco 0010-F3-1IFC bc I am adding 5 more zones, and 2 zones will go up to ...
1
vote
1answer
34 views

A.c. fan outside not coming on

It started with the thermostat not going in on only fan. That night i go to turn the AC on and the condenser fan wouldn't come on so I took a stick moved the blades and it started . i thought its the ...
2
votes
2answers
83 views

HVAC fan on compressor not coming on

I noticed today that the button on the thermostat isn't turning the fan on by itself. I tried today just to turn on the fan couldn't get it turn on. Tonight we turn on the AC couldn't get cold air. ...
0
votes
1answer
9 views

Heat pump filter

I have a trane heat pump in my attic, do I replace the filter in the air handler AND return grill? Not sure if I can use just the return grill which is in my hallway ceiling
1
vote
1answer
33 views

How should I size an air conditioner for a room in the attic?

My bedroom is upstairs in the attic and much of the interior walls/ceiling are the underside of the roof. I believe there is a couple inches of hard foam between the drywall and the sheathing/roofing....
0
votes
2answers
38 views

What is the difference between the filter on my furnace and an Air Exchanger?

I live in the Pacific Northwest (Seattle area) and the allergy season has started for me. It is so bad that I am thinking about getting an air exchanger for next year. The house I live in was built in ...
1
vote
2answers
69 views

HVAC Heat Supply - Register type (Square Register or Round Diffuser?)

We are adding new heat supply runs to our basement ceiling. We have had 3 HVAC contractors look at it and all 3 want to use 5" round air diffusers instead of the normal metal square registers. Here ...
1
vote
1answer
29 views

New Cold air return at the end of duct?

I've readarguments against putting a new heat branch at the end of a duct because it essentially lets all the pressure out the end, but does the same theory apply to a cold air return?
1
vote
3answers
47 views

Furnance Drain Line Not Draining

Recently had a new furnace/ac/ductwork installed in our home. The furnace/air handler are located in the attic on the second floor of the home. A drain line is run from the unit to the utility room on ...
0
votes
0answers
14 views

Does an open circuit on the high limit switch trip the reset

My American Standard Freedom 90 furnace works all day and all night until morning. I set the temp back at night. It starts up in the morning then kicks out and only blower runs. I push the reset and ...
1
vote
1answer
26 views

Garage Vent Intake/Exhast

So I have a 1.5 car garage that seems to be sealed off, airflow wise pretty well. Any moisture from rain or snow just seems to sit and not evaporate at all or extremely slowly. Also, I dry out my ...
1
vote
1answer
21 views

Use CLR to clean stuck bleeder valve

I was bleeding the air out of hydronic heating zones and I notice some mineralization on bleed valve attached to my air scoop. I took the Schrader valve cap off and tapped the valve I noticed it was ...
1
vote
2answers
43 views

Why is the defrost cycle of an HVAC so loud?

During the colder months when defrost mode switches on it can run for roughly ten minutes to thaw out the unit. I understand that. My question is why is it so loud? Why does it have to make such a ...
1
vote
1answer
27 views

How often to change Aprilaire AC Filter

I have a AprilAire #2210 Air Filtration system connected to my central AC unit in the attic (https://www.aprilaire.com/whole-house-products/air-purifiers/model-2210). I am trying to figure out how ...
2
votes
1answer
87 views

WiFi Thermostat, No C Terminal on Furnace

Really hope someone can help me with this. I've looked through the other posts and can't find one similar enough to mine to answer. I've got an old gas furnace + AC and i'm installing a Sensi Wifi ...
1
vote
1answer
44 views

Material for stud cavity cold air return

I'm totally aware of the arguments for and against stud cavity air returns so I don't need opinions on that, but I do need an idea of the best material for lining the outside of the stud cavity with. ...
2
votes
0answers
79 views

Junction Box Blank Cover in HVAC Duct

I am starting a bathroom remodel second story that requires a length of NM wire to be lengthened by a few feet. I realize I can't do this hidden in a wall or floor and need this done in accessible ...
1
vote
1answer
33 views

First Co Air handler + Gas Hot Water boiler: Connect thermostat for gas or electric?

My apartment's mid-90s heating system consists of a gas-fired hot water heater feeding a First Co TAQ1824 air handler. The air handler has a fan and blows hot air through air ducts. The system is ...
0
votes
0answers
58 views

Thermostat Upgrade, furnace C-wire reading low voltage

OK so here is the scenario. Upgrading thermostat from dumb to smart (Ecobee). I've done 2 others in my house that required re-wiring so I have a good sense for what should be done but I'm stuck. My ...
1
vote
0answers
59 views

Controlling one FCU with two thermostats

I have a chilled water fan coil unit that will feed two areas, living and the bedroom. I want to control the FCU with two thermostats, one in the living and one in the bedroom, (preferably) in a ...
0
votes
1answer
18 views

Thermostat controller switch?

Would two thermostats be possible if a master control switch was in place. For example I leave one end of the house, throw the control switch, and set the thermostat at the other end of the house. (...
2
votes
1answer
89 views

Connecting Common Wire from thermostat to Air Handler

My apartment has a central heating/cooling HVAC system consisting of a gas-fired hot water heater which feeds hot water to a First Co air handler for heating, and a rooftop compressor which feeds ...
1
vote
1answer
36 views

What should my thermostat show when switching Heil furnace from winter to summer?

I will be ready to switch furnace from winter to summer tomorrow. It's a dual system/oil switches over at 32. What should it read on my honeywell thermostat when i switch it over. Help appreciated.
0
votes
1answer
32 views

Trane Furnace Fan Works, But Heater Won't Run

As stated, my heat isn't coming on. When this started: Everything has been all fine and dandy all winter. The other day I ran the fan only for a few hours without the heat. After this, my heat ...
1
vote
3answers
64 views

Furnace can’t keep up when set to ON but keeps up fine on AUTO. Is this normal?

I’m in a pretty cold state. It’s been below zero F quite often this winter. My furnace has not been keeping up and my house has gotten pretty cold. I got some space heaters to supplement. Furnace is ...
0
votes
1answer
41 views

Why doesn't my Trane rooftop furnace ignite?

I’m having problems with my Trane model Yc0060C3H0AA rooftop unit. My inducer motor comes on, my igniter lights up and I can smell the gas valve opening up but my burners will not light. Serial # ...
10
votes
2answers
2k views

What's the best tool for cutting holes into duct work?

I've cut a few supply and cold air returns into my main branches and it's been a PITA. Need to cut another 6" hole for a return, it's just standard rectangle ductwork, probably 14" wide x 10" high.
1
vote
1answer
112 views

Thermostat C Wire (Possibly Unconnected)

I purchased a Honeywell RTH6500 Wifi Thermostat, which requires a C wire. My old thermostat showed a connected blue C wire. However, it was battery-powered. If I removed the battery, the thermostat ...
0
votes
0answers
36 views

HVAC System Making a “Turning Over” While Heating

My HVAC system is running for a very short time, then turns off and then makes this turning over noise. It's a 10 year old Amana heating and air conditioning unit. The sound seems to be coming from ...
0
votes
2answers
70 views

Is there HVAC system to maintain air temperature, humidity and carbon dioxide level in the house? [closed]

I'm looking for a HVAC system or device which can maintain predefined air temperature, humidity and CO2 level in the house. It would be nice if such a system can be upgraded to scale it for more rooms/...
1
vote
1answer
61 views

Connecting Common Wire to Control Board

I have a heat pump and want to add a thermostat that requires a common wire. I have read through many threads that show how to add a wire but I already have a few extra in the bundle so its not so ...
2
votes
0answers
56 views

How do I stop the ticking noise coming from my furnace duct? [duplicate]

I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
0
votes
0answers
25 views

Furnace blower cycles off then on

Upon a call for heat my gas furnace (1997 Coleman/Evcon model DGAT056BDD counterflow furnace) blower normally delays coming on for 90 seconds. It consistently runs for a few minutes, stops for 8 ...
1
vote
2answers
70 views

How much cooling is my mist maker humidifier causing?

Closely related to Does a humidifier cool the air? but with a different kind of humidifier, and I'd like to know exact numbers. First question: for the same production volume of vapor, does an ...
1
vote
1answer
97 views

need to connect a c wire to my furnace/air conditioner

I installed a nest with 5 wires, but the blue wire is not connected to anything on the 25-30 year old furnace. We tried connecting the blue wire to what we thought was a common terminal, but the ...
1
vote
1answer
16 views

High elevation non- pv Burnham boiler with Tejurland powerventer installed at sea level [duplicate]

I have a 203ncl-tei2 boiler installed in danvers Massachusetts. This town is at sea level, not 2000k miles up. This boiler also has a failed tejurland (universal control) powerventer motor on it that ...
1
vote
0answers
25 views

U.s. boiler / Burnham boiler alterations

i have a 203ncl-tei2 boiler installed in danvers Massachusetts. Regular elevation. This boiler also has a failed tejurland (universal control) powerventer motor on it that is only humming, not ...
3
votes
0answers
39 views

Why isn't my furnace igniting?

I noticed cold air from my Carrier 58SS furnace. The main burners were not lighting. The pilot flame was strong, but yellow. When I tapped on the gas valve, the pilot shut off. I removed the pilot ...
5
votes
2answers
914 views

Can I use a larger HVAC Hard Start kit than is recommended?

I've got a 2.5 ton HVAC system. I've been looking at adding one of the 5-2-1 Hard Start kits to reduce the wear on the system. I see that they have recommended sizes for 1-2-3 ton, 4 ton, and 5 ton ...
2
votes
1answer
110 views

Is a flexible coupling okay to use on an ABS furnace exhaust pipe?

I want to use a Fernco coupling for 2 inch furnace exhaust is it okay? The venting is ABS and runs low across a doorway. I want to be able to bring stuff by and replace the pipe 2 times a year.
0
votes
1answer
51 views

Where to connect Blue C Wire at old furnace?

I have looked at other responses and each layout is a little different. Looking to connect a Smart Thermostat and need to know where to connect the Blue wire at the Furnace. See the attached picture....
0
votes
1answer
33 views

Do new Air conditioning units require new pads?

Is a new pad required when an entire new central AC unit (inside, outside, ductwork, everything) is installed? Does the outside unit require anything around it when it’s in the backyard?
0
votes
2answers
27 views

Forced-air heater for old floor registers

I have an older home which used to be centrally heated by a furnace in the crawlspace, but has since been retrofitted with forced-air wall heaters: Some of the wall heaters are in inconvenient ...
0
votes
1answer
52 views

Half of furnace turned off?

I moved into this house about 10 years ago, I noticed on the furnace that one of the breakers for the electric coils is off with a note saying "Leave breaker off". After cleaning out the blower for ...