Questions tagged [hvac]

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

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15 views

HRV Supply/Blower making a terrible sound

Here is a video (with sound): https://streamable.com/w8tgqk (You have to go about 0:20 in to hear the sound). I got unlucky during recording and the sound was more intermittent, but normally it's loud ...
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1answer
57 views

Help wiring an old HVAC blower to use as a shop fan

I replaced my old HVAC system and a friend suggested asking the HVAC company to leave the fan unit to use as a shop fan. I thought it would be a simple task to add a plug to the motor and off it would ...
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1answer
29 views

Is it worthwhile to replace evaporator coil?

My AC condenser is done for and needs to be replaced. The evaporator coil is 15 years old and still working. I could get both replaced at once, or just replace the AC condenser. Doing both will cost ...
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2answers
88 views

What's the point of AC fan speed?

Does higher fan speed make the room cooler? But then, if the thermostat is set at a certain degree doesn't the AC keep the room at that temperature regardless of what speed the fan is set on? What ...
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12 views

Pilot light issue

Thermocouple has been changed but pilot still wont stay lit. Is it gas controller?nSo what now? I may also have a cracked heat exchanger but that would seem unrelated. A small amount ofwater ...
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1answer
85 views

What’s asbestos look like on heating vents?

I’m repainting my heating register vents and noticed something on the ductwork I didn’t see before. Pics attached. Judging from a google search, it looks like the section of ductwork that connects to ...
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3answers
84 views

Thermostat location in 3 story building

Where would you place the thermostat in a single zone, 3 story building. Tt's a multi-family residential, 3 units, one unit per floor. The boiler is a high-efficiency condensing boiler in the basement,...
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0answers
27 views

How to calculate temperature rise rate for hydronic water tank

The engineering to figure this out is beyond me! I have a freshwater hot water tank that holds 30 liters of water. It is heated by hot water (coolant) running through an internal pipe (the heat ...
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1answer
68 views

12/3 to disconnect box for mini split install?

I have an issue with installing a disconnect box for my 24k LG mini split condenser unit. 12/3 is coming from 20 amp double pole breaker to disconnect box with surge protection box(ICM517). I ...
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1answer
785 views

New ecobee3 lite, have heat but no cool option

I recently installed a new ecobee3 lite. When I completed the setup process, I found that there was no option to enable cooling. My original setup had both heat and cool options. I believe the option ...
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1answer
43 views

What's the best way to install permanent high/low gauges in a compressor based HVAC system rfc134a?

I have a heat pump water heater, and would like to install permanent pressure gauges on the liquid and suction lines (or more likely have a professional install the gauges). Analog gauges are fine, ...
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2answers
89 views

Is it safe to install the outdoor unit of an inverter AC indoors?

We are planning to buy an AC unit based on inverter technology for heating our living room. I am not an expert as far as HVAC or heating technologies are concerned, however based on my understanding ...
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1answer
553 views

Is it a problem that my furnace filter is loose in its slot?

When I bought my home, my furnace had a 16x20x1 nominal-size filter installed, and that's what I've been buying for replacements. This size doesn't fit the opening very well; there are large gaps ...
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1answer
51 views

Different wirings on 2 thermostats controlled by a 2 minizone system

I was replacing my 2 thermostats controlled by a 2 mini zone system (Trol-A-Temp). One of the thermostat has 6 wires/terminals (Y,W,R,G,O,B). The other one has 3 wires/terminals (Y,W,R). I was ...
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1answer
26 views

Would missing check valve make it seem like heat is always on?

We had an extra zone added to our hot water heating system. The installer used a Taco 007-F5 circulator pump but did not install a check valve like the other zones have. I have verified the pump does ...
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1answer
29 views

Home AC Filter Location and Half Inch Sizes

Our home AC system allows us to put a filter either in the ceiling intake or directly under the air handler intake. I feel the ceiling intake may be better because more debris will be trapped before ...
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1answer
54 views

Installing Ecobee 3 Smart Thermostat in Apartment

I live in Scottsdale AZ and I just purchased an ecobee smart thermostat. I’ve tried multiple ways when wiring up the thermostat. I followed all instructions closely. Can anyone help. The new ...
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1answer
38 views

Rerouting return air duct in furdown

So I ran into this issue that seems quite gross that it was located inside the furdown in the bathroom, which was becoming layered in gross dust, hair and crap that gets sucked up. We removed it as ...
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1answer
48 views

Home Heating Efficiency

See a similar question I posted a few years ago: Heat pump minimum compressor temprature I have a custom built new construction home, but I was not involved with the build process, so I don't know the ...
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1answer
150 views

Heating above ground pool by re-circuplating pool water through tankless, on-demand water heater

Due to covid-19 all indoor pools in my area are closed for the foreseeable future. Kids being swimmers, I purchased an Intex 15' round above ground pool and installed in it in the garage. It worked ...
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3answers
356 views

AC related power outage (partial)? HVAC?

So running into a weird situation that I have not encountered before. Back ground - house was built in the late 60/early 70s - 3 bed 2 bath So we have a weird situation where our house is partially ...
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2answers
82 views

What is this in my air duct

I started hearing a whistling sound coming out from the return vent for the air conditioner. So I pulled out the filter to inspect it and noticed there was something odd inside the duct. It looks ...
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1answer
71 views

Can a single 8“ flex duct be split into a 5” flex and 7" flex?

Our house used to have a fur-down A/C unit that fed a series of rigid ducts made with duct board. We'd like to replace a vent in our bathroom (5' x 11') with a 5" flex duct. We'd like to ...
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0answers
12 views

Intermittent fan blower on heat, cool, and off

Fan will run on odd time increment (6 seconds on, 1 min off, 2 hrs on , 3 min off, 20 sec on, 1 day off 12 hrs on etc....). Does this on heat, (satisfied stat) cool and stat turned off. Indicator ...
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1answer
80 views

Can I use 8" flex duct on a 7 inch rigid duct connection?

I am moving ducting three studs down, so I need to extend an insulated 7” flex pipe run that bridges a 7” elbow with a 7” floor register duct. 7” flex is hard to find locally but I have plenty of 8” ...
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0answers
65 views

replacing ductwork in a mobile home with round duct?

I know that most mobile homes use a single trunk duct that is 14" x 4" and all use a special furnace due to that size being used. , how easy is that to replace? I found out most of my duct ...
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2answers
86 views

How can I know if my HVAC is taking air from outside?

I am currently affected by the US West smoke, so I bought some good filters for my furnace. I also bought extra filters and taped them in my ceilings where the air from the HVAC comes, for some extra ...
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2answers
36 views

What is the dynamic head capacity of this pump?

I am looking to buy a condensate pump that can push water 20' away ( I need to circumvent the fact that I can't slope a drain through the ceiling so I need the pump to push 8' up and then another 10' ...
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1answer
315 views

How long a horizontal run will a condensate pump support?

I have the model 21786 condensate pump described below. The specs say it can push the water up 16' using a 3/8" PVC pipe. Does this mean it will do it in any possible direction (my case 8' to the ...
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1answer
50 views

HVAC started whistling after changing filter

I recently changed my HVAC filter and followed the same airflow direction (pointed arrow direction) as was on the previous filter. Almost immediately after replacing it, I keep hearing a whistling ...
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1answer
41 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
50 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
41 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
77 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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0answers
15 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
57 views

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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4answers
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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1answer
126 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
29 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
98 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
40 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
123 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
127 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
178 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
55 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
27 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
79 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
45 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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0answers
29 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
33 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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