Questions tagged [hvac]

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

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1answer
36 views

HVAC fan turned off by itself with associated burning smell

I'm in the PNW and we're dealing with lots of wildfire smoke. Accordingly, I've been running the fan on the HVAC nearly continuously for the last 4 days so that air will go through my electronic ...
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1answer
44 views

Can I use a plastic basin positioned near joists to compensate the lack of slope in a ceiling condense drain?

Is this a design that is acceptable? Basically I am building a small box that will collect water pumped up by the condense drain. I will put this up in the ceiling in the furnace room just between the ...
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1answer
38 views

Is there any way to drill through minerall wool in order to install a pvc pipe?

This is related to this question What type of pipe should I used to build a gravity drain from my furnace to the bathroom plumbing? I am building the red pipe in the below picture, This is the condese ...
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1answer
32 views

Sound proofing a panned floor joist return run (basement apartment)

I'm building a basement rental unit in our home. We'll be living upstairs so I'm doing my best to sound separate the upper and lower units. I'm using a seperate hvac system for the basement (baseboard ...
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11 views

Ducting options for HRV Install

Hoping to install an HRV in our house to improve winter air quality. One floor ranch with a full basement located in Vermont, so cold winters. The upstairs in entirely finished and there is no ...
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3answers
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Condensation on just 1 duct in unfinished basement

We live in the Northeast (PA) and have a new construction home that we have lived in for a year. The home is small (1300 sq ft, open concept first floor) with an unfinished basement. The ceiling of ...
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3answers
3k 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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1answer
44 views

How serious is a badly kinked suction line on a split system A/C?

A friend had me remove a section of drywall to see why there was moisture damage at the baseboard height on one wall. I found the refrigerant line that runs from outside compressor to attic mounted ...
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1answer
24 views

Installing a y pipe

I had sweating ducts.i pulled the drywall down and wrapped all the ductwork.the main stack, two 4 inch ducts and two 6 inch ducts in my dining room and into the kitchen. I got to one spot where the ...
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3answers
83 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

Compressor inside condenser switches off on extremely hot days, makes high pitched noise (video!)

Our AC stops emitting cold air on very hot days (100+). It recovers after about 1h of not running. The condenser fan keeps running, but the compressor switches off. I only recently caught it as it was ...
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2answers
47 views

Electrical outlet above HVAC air return, within same wall cavity

Q: Is an outlet above the HVAC air return considered within the environmental air space? We need to move the HVAC air return in one of our rooms, and there is an existing electrical outlet in the most ...
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2answers
117 views

Recovering R-22 refrigerant from a system with locked compressor

Compressor locked on my 29 year old R-22 system. Will be getting a full new system: 4 ton R-410A, NG furnace and air handler. My HVAC service doesn't have the right coil in stock and while waiting for ...
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2answers
84 views

Can I configure a two-stage thermostat to manage two heat systems?

The System I have a relatively simple system. It starts out with a standard, run-of-the-mill Rheem gas forced air setup with central air. One transformer in the furnace goes to one thermostat like ...
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1answer
53 views

Why are HVAC coil drip pans designed to pool water? Is it normal or what can I do about that?

I have an Amana where the HVAC coil drip pan must pool water to about a 1/4 inch before water starts to flow out the side of the pan. I keep reading Standing water is not good to have because mold can ...
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0answers
26 views

How can I tell if I have a variable speed HVAC or whether I need it?

I read a website that says, "Zoning a single-stage system is always going to be a sub-par design." They basically say a zoned HVAC system is inherently bad if it is single stage. That kind ...
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1answer
63 views

Gas Combustion Air Duct Re-Route Considerations

What are the safety/legal considerations for safely re-routing gas combustion ducts? I have a two-story house with two gas combustion air ducts. The left duct serves a fireplace that is not in use and ...
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1answer
41 views

Wiring Ecobee thermostat to Vulkan gas furnace with no C terminal

I am trying to wire up an Ecobee thermostat to an old (1997) Gas central heating system but I got up into the roof then realised I have no terminal labelled C. Now, I don't super know what I am doing, ...
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25 views

What type of pipe should I used to build a gravity drain from my furnace to the bathroom plumbing?

In the picture below, the existing pipe that is used by the condensate pump runs across the red line in the figure (it does not connect exactly there but that is the idea) That line is a clear pvc ...
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0answers
32 views

AC not blowing cool air, Contractor said HVAC unit is perfectly fine and that it has to do with my smart thermostat (Ecobee 3)

So basically I changed out the filter on my HVAC unit (National Comfort Products, Model CPG41238-U23) and after I did that the AC stopped blowing out cold air. It was working completely fine until I ...
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1answer
58 views

Can Home AC Electrical Whip Cause Compressor Failure?

I have an 11 year old Arcoaire ac unit. The other day we heard a pop sound and noticed a little smoking coming from the electrical whip casing. The part of the casing with the issue is about half ...
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0answers
50 views

Replaced AC Filter and now AC is not turning on

I just changed the filter for my National Comfort model CPG41238-U23 AC unit and now the unit is not turning on. Initially it was turning on but constantly short cycling every 30 seconds. Now the unit ...
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1answer
27 views

AC intermittently doesn't cool

I have a Lenox system that is AC only (my heat is separate). On occasions, maybe 10-20% of time, it doesn't cool and the fat refrigerant pipe coming out of the air handler going to the condenser ...
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1answer
34 views

Is TXV required when an appropriate piston/orifice is used?

I had a Goodman GSX140181 1.5 Ton 14 SEER Air Conditioner R-410A installed with a Goodman CHPF3636B6 3 Ton Horizontal A Evaporator Coil installed by a contractor. It came as a kit, along with a ...
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0answers
34 views

Two vents in utility room, one to AC one directly to attic where hot moist air comes from?

I have a question about my AC system/attic/laundry room. This is a new house built in 2019. Been living here for a year. I Noticed the laundry room has always been humid and figured it was because of ...
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1answer
94 views

Did I fry my Furnace Control Board? (C -> G rewire attempt)

So while I was attempting to figure out how to get our fan to run independent of our heating/cooling, I looked at our thermostat wiring and discovered that it only had wires running to C, W, Y, and RC/...
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2answers
353 views

Is there a required or recommended minimum distance of an HVAC duct from an exterior wall?

I am removing an interior non-load bearing wall and need to move an HVAC duct a few studs over. I am leaving a short wall near the exterior to accommodate the duct as well as to serve as an endpoint ...
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1answer
60 views

Is negative pressure bad and how to fix?

I have a one story house and I think there is a negative pressure problem. If the central a/c is on and I close the hallway door the hallway heats up like an oven. This hallway leads to all the ...
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0answers
38 views

Cold air blowing from return air vent

Cooling stopped working on my second floor zone, and cold air was blowing out of return air vent. I turned off the power to HVAC , it didn't work. When I turned off the thermostat of my second floor ...
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2answers
34 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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0answers
26 views

Is there an easy fix for bad air balancing?

This is my situation: My condo has central heating and air with a zone for each of the two floors, but the balancing of the system is pretty bad: Our upstairs master bedroom and our upstairs office ...
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1answer
39 views

Sizing HVAC: 3 vs 2.5 ton AC, 60k vs 40k BTU furnace for 1200sqft?

I'm adding a HVAC system to my single-storey SFH (1200sqft in climate zone 2, San Jose, CA) and the contractor picked out the following system: Furnace: 60k BTU @ 80% Efficiency AC: 3 Ton @ 14 SEER ...
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4answers
101 views

Where is A/C switch? How to turn it off?

I'm trying to install a new c-wire based thermostat, and I plan to turn off the A/C power before I touch the C and R wires (24v). However, I couldn't locate the power switch. The breaker box has some ...
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0answers
24 views

Nest thermost not working with Rheem A/C C wire

My A/C unit was recently replaced. I have a Rheem RGEA14036AJT06XAB. The techs installed a pretty bare-bones thermostat since my old thermostat was reading 5 degrees off. So I decided it was a good ...
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1answer
42 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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1answer
62 views

Safe & chemical free way to clean AC coils?

My ac system last had regular maintenance/inspection 9 months ago. Normally I have it done every 6 months but due to coronavirus the company I have a warranty with isn't honoring their warranty. And ...
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2answers
57 views

Is it worth of replacing central AC coil?

my central AC is a 16-year old Trane. According to inspector, the compressor is still good and all the conditions seem to be good, except the coil is leaking. It is an old model so it uses R22. As it ...
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1answer
20 views

YORK AC unit rusted support arm

I have an old YORK ac unit still running R22 and have recently cleaned the entire unit inside and out. As I took apart the unit, one of the 4 corner supporting outside vents was rusted completely and ...
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2answers
64 views

A/C units sweating in the attic

I have 2 Heil 19 SEAR units that are sweating tons of water in the pan. They are V speed units that can regulate the humidity in the house to 50 t0 55. The house is a foam house which has been sealed ...
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3answers
58 views

Does this seem like the right place to tap a C-Wire from my heater?

I need a C-wire for my thermostat but my heater only has R and W connectors (red circle). On the schematic on the heater, up top (red arrow), looks like: 5 is 24V Gnd (bit hard to read but i've ...
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0answers
107 views

How does this wiring work?

I have a Trane XV90 and XL 14i. The wiring looks a little strange as in the picture bellow. _____________ | | BK W2 W1 R G Y B/C YLO O |___||...
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33 views

Can I use a portable AC Inside my outdoor enclosed cabana for my massage therapy work during summer?

Can I use a portable AC Inside my outdoor enclosed cabana for my massage therapy work during summer? I was thinking putting the vent underneath one of the side panels. Probably need to duct tape the ...
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0answers
24 views

R and G wire jumpered and G is not connected to thermostat [duplicate]

I have a Trane XV90 furnace and XL14i AC. The thermostat is old and I want to install a Honeywell Wifi one. Today I just checked the wires and found on the control board R and G are jumpered and the G ...
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2answers
42 views

Which AC Hard Start kit capacitor I should use?

My AC system is getting very old and I was wondering if I should add a Hard Start kit and with what spec? Here is my AC spec included below and the existing Dual Run Capacitor is 440volt and 40+5MFD.
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1answer
65 views

How can I keep my southern facing bedroom cool in the Arizona Heat?

Our MB is on the South side of our house in AZ. It stays warmer than the rest of the house. I am considering installing and 8" in-line booster fan at the 'T' where the supply duct (flexible) ...
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1answer
62 views

Adjusting Blower Speed for Central AC

I am trying to lower the fan speed on blower fan. It is currently set to factory default setting. My AC is 3 ton unit. Model no is 4A7A3036H1000NA. The fan settings on IFC are like TAP 1, 2, 3.... and ...
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2answers
72 views

How to properly repair siding holes

I noticed the AC installation by my house's previous owner left an unpatched hole in the siding, close to the ground. We have a lot of rain in the fall/winter. I don't know how long it's been like ...
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0answers
25 views

Blaring noise from newish indoor AC unit

Why is my AC making a noise like Mass Effect Reaper every 20-60 seconds and how can I stop this? https://webmshare.com/play/qd07r
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3answers
2k views

There is a pvc pipe that goes into my floor next to my water heater and central ac unit and its overflowing..but why?

Let me start by saying i'm not a plumber nor have i done HVAC. Last night i walked in and noticed I've have a leak in the corner of my living room so i looked for where it was coming from and on the ...
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2answers
21 views

Air conditioner HVAC filter size and frequency of change

I've been struggling to understand air filter sizes and the frequency of changing them out. We have a Rheem 4 ton AC unit. Below is the filter (20x25x4) we currently have in our attic and some info ...

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