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

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3answers
65 views

Compressor/fan stays off when cooling turned on

Before I begin, I would like to request "call a technician" suggestions to stay off. I do know a nice guy who can look it up for me, for a variety or reasons, one of which being my general history of ...
3
votes
1answer
115 views

Mounting a window air conditioner on top of a sliding horizontal window

I need to install a window air conditioner in my master bedroom. However, the only suitable window there is a horizontal sliding window. To complicate things more, I need to place it on top, since my ...
4
votes
3answers
186 views

Why would Central AC, Fridge & Pool Pump All Fail Within 3 Days?

Could this be systemic? Something in the electrical system for instance? Or is it likely coincidental? HVAC repair says they can't find a leak but the freon is very low and was fully charged in ...
2
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0answers
27 views

Air handler for an AC in the attic collect about 1 cm of water in it before it is high enough to drain… problem?

My air handler in my attic won't drain water(because the hole is 1cm above the pan) until the water reaches that hole. Why is this setup this way. From what I have read, NO water should be in the ...
3
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3answers
83 views

Duct Cleaning: Is Duct Sealer Necessary, Non-Toxic?

A professional contractor is cleaning AC Ducts, and after he scrubs the ducts, he wants to apply an acrylic duct sealer and de-odorizer. The container of the duct sealer has minimal lableing and does ...
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0answers
104 views

Swapping out Nest for Ecobee - c-wire issues

We are trying to replace our nest with an Ecobee (with remote sensor capability). We have an existing Nest thermostat which was installed on our boiler/radiator system last year. Back then, we had ...
2
votes
3answers
107 views

Will a 2-stage heat pump cool my upstairs on low stage?

I am currently upgrading my furnace from an oil furnace/AC combination to all heat pump. I am considering two stage vs single stage heat pumps. I understand that two-stage will supposedly give me ...
2
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2answers
20 views

Zoned heating system very warm even without heat on upstairs?

I know heat rises, but our 1st story floorplan house gets pretty darn warm during the winter months. Other than turning on the AC or opening windows in the upper story zone, anything else that could ...
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1answer
22 views

I have an electric furnace that sometimes blows cold air

I have an electric furnace that blow cold air sometimes. I replaced the thermostat and that did not fix it. The fan blows fine. If I shut if off for a few minutes and then try again, about half the ...
1
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1answer
26 views

Why might a thermostat refuse to switch from Heat mode to Cool mode?

I have this Honeywell RTHL2410C programmable thermostat and typical Florida electric AC system. Starting this Spring, it has started behaving strangely when switching from Heat to Cool mode. The ...
3
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1answer
48 views

What inspections/maintenance should be done before first air conditioning of summer?

I'm a typically handy guy who knows his limits. I recently moved into a new house so am unfamiliar with the history of the equipment. Before I switch the thermostat to A/C for the first time this ...
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0answers
9 views

Have Goodman GHM81405 gas furnace that begins to ignite and then stops

I have a Goodman GHM81405 gas furnace that begins to ignite, and then turns off after a couple of seconds. I have cleaned the ignitor but it still does the same thing.
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1answer
42 views

Could a leaking boiler be fixed?

I'm having a leaking hole in the cast iron boiler tube so does it mean that its time for a new boiler or is there any way it could be permanently fixed?
0
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1answer
35 views

Does thermostat need to be grounded?

If a thermostat is connected to an air handler, which is connected to the main panel and has a ground wire, should one of the thermostat wires be connected to the ground?
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0answers
24 views

Thermostat replacement in a double wide

We have a new double wide and I want to replace the thermostat with a new programmable one. We took off the old one and it has 3 red wires, 2 yellow, 1 white and 1 green. I get the 2 red indicate a ...
1
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1answer
26 views

Does the air temperature outside at the time of spring inspection matter when the tech comes to inspect and clean the inside and outside units?

I have semi annual inspections done on my A/C units both inside and outside. Will the temperature outside effect the tech's ability to properly clean and evaluate the operation of the units? The ...
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2answers
44 views

Can I replace my furnace's high limit switch with a comparable third-party part?

I have an older Lennox furnace. The high limit switch (#60T15,130F) has gone bad. I haven't been able to find on-line this part number with the exact temp limit specs, and Lennox no longer carries ...
1
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1answer
32 views

Thermal Expansion and Contraction in Two Story Townhome

I live in California in the city of Chatsworth to be exact. I live in a two story Townhome and for the most part when I sleep in my bedroom it's very quiet. Occasionally there will be nights sometimes ...
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2answers
54 views

A/C tune-up: “Condenser fan motor drawing high amperage”

A local A/C company was offering a deal on a home heating/cooling "check-up". I've never worked with this particular company before, and I've had some bad experiences in the past (different home, ...
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0answers
10 views

GeneralAire 1137 & Honeywell Wi-Fi Color Touchscreen Thermostat

I have a GeneralAire 1137 power humidifier attached to my furnace. It was never wired to the humidistat it came with, basically the installer ran the wires to my bedroom next to my furnace ...
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1answer
37 views

Blower motor runs won't shut off no heat

My furnace is set at 72, my house is 64. I have no heat, and when I turn the thermostat off, it continually runs. When I'm running the air conditioner, it blows heat. What is a possible cause?
5
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2answers
73 views

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling?

Can I install A/C in a home built in 1924 which has round heat ducts in the ceiling? I am looking at homes to purchase in Milwaukee, WI. The home seems to have all it's ductwork above the ceiling, as ...
0
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1answer
38 views

electric heater keeps needing to be reset by turning fan on and off atleast every 1-2 days

My electric furnace is about 23 years old, it quits working but does not trip a breaker. It feels warm to hot at furnace and just kind of clicks occasionaly when I turn thermostat up to 90 to try and ...
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1answer
38 views

Oil furnace fan won't shut off when “heat” plug is connected to control board

I was changing my thermostat and I attempted to make the swap live without turning power off. When I connected new thermostat, the fan kept running. Ruled out bad thermostat and wire short by ...
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0answers
32 views

Why does my furnace blower fan intermittently hesitate for a second then continue?

Recently I had my 5 year old gas furnace serviced to replace a failed exhaust fan. Ever since, when the heat blower fan runs, it hesitates (stops) for about a second, about every 30 to 60 seconds, ...
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1answer
22 views

Are foam filters in return important?

I recently got all my hvac replaced, and in the returns were these black foam filters. Unfortunately, the drywallers sprayed texture all over them. I didn't have these in my old returns, but it still ...
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2answers
73 views

Does my furnace's air filter do anything at all?

Our house seems very dusty. The tops of bookshelves, computer screens, etc seem to accumulate a thin film of dust just a few days after cleaning. Certain other co-inhabitants of my house have ...
3
votes
3answers
134 views

Was this furnace installed properly?

I am looking to answer the following: Was this job done properly, and if not, then how really bad it is? And should I hire this contractor again ? Product: Ruud RGTM10ERBJS 100K BTU 95% ...
1
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1answer
74 views

On wall near floor or ceiling for supply ducts in basement

I'm starting to finish my basement and I'm curious if I should put my supply ducts in the ceiling or the exterior wall near the floor. I have the configuration to easily do either. Any thoughts on ...
0
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1answer
31 views

Electrical Disconnects for condensing unit

What year did the NEC code require electrical disconnects to be installed at HVAC condensing unit?
1
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3answers
62 views

What's the most cost effective way of ventilation automation given no prior knowledge in the field

I have 3 fans for air inflow, and 3 fans for extract, all in one big hall. Currently I set the power of their motors with dimmers myself, looking at CO2 and temperature readings. I want to replace ...
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0answers
28 views

Heat Pump Extended Distance from House

I am replacing a Gas Pack with a Dual Fuel Heat Pump. I live in Tennessee so the temperatures are generally moderate. The location of the current pad is right next to the house, between my deck and ...
3
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2answers
105 views

Continued Excessive dust in home air

I'm having minor breathing issues and suspect the home air quality, which seems to be excessively full of particles/dust. The air quality is visually noticeable daily, regardless of basic ...
3
votes
2answers
143 views

How to address loud cold air return

The cold air return on my forced air furnace is too loud. While it is is tolerable, there is a noticeable sound of rushing air when the furnace is running (not a whistling sound, just a blowing ...
1
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3answers
112 views

Leakage in my pipes, how to densify/seal?

I've never built with pipes before so maybe I'd need some general advice regarding leakage. On a specific note, I've built a system (see picture) where it leaks practically everywhere. I've sealed it ...
1
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1answer
52 views

HVAC - Circuit Board Fuse blows on AC Switch

I have a Honeywell System. Back in November of 2014, I replaced the Circuit Board with one by Honeywell from Amazon (1014460). The blower motor was replaced over 2 years ago. Last month, I have ...
1
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2answers
112 views

HVAC technician can't do ductwork because of zoning limitations?

I'm doing a renovation on an unfinished area, size about 350 sqft. During my rough framing/electrical/mechanical phase inspection, my county inspector didn't mind the idea of tapping into the ...
0
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1answer
31 views

Why doesn't the extra C wire work when hooking up WiFi thermostat?

My existing thermostat has an extra 5th wire. It's blue. We used that as the C wire. We have forced hot air so we checked the furnace and it has all the wires hooked into a clip that plugs in. It has ...
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3answers
168 views

How to insulate register boot?

The county inspector dinged me on a couple of things for my bonus room renovation. One of these things is wrapping the register boots (endpoints) in insulation. I've seen registers with this ...
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1answer
30 views

how to measure CFM in digital animometer [closed]

dear friends how to measure CFM in digital anemometer and tell how its calculated in both practical and theoretical
7
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2answers
1k views

Should I bypass a thermal cut-off switch on my oil furnace?

My thermal cut-off switch for my oil furnace blew and my neighbor replaced it until a tech could come out and check it when I had my cleaning. The switch blew again and the furnace tech bypassed the ...
0
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2answers
72 views

Bedroom 10 degrees colder than rest of floor!

I'm at my wits end. I just moved into a new (for me) 2 story house (1998) that has some weird heating issues. The house is about 3200 sqft the upstairs is heated by a furnace located in the attic. its ...
0
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1answer
38 views

Why does my nat gas furnace pilot light stay lit at normat temp setting, but goes out when I bump the temp up a couple degrees?

Recently the gas company replaced our meter and thermocouple. After they left, the pilot light kept going out randomly. 4 techs came over a 3 day period and could not diagnose except to reassure ...
0
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1answer
54 views

Wiring for New Thermostat

I just bought new programmable z-wave thermostats (Honeywell TH8320ZW). I thought I had the wired correctly, but I woke up to a pretty chilly house this morning. The fan is working, but it seems to ...
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0answers
21 views

Furnace pilot goes out after furnace runs

I have a Cozy standup wall unit furnace CF553D-H. When the thermostat calls for heat it starts and will power up the ought both fan levels ... Then as it reaches temp and starts the cool down, the ...
1
vote
3answers
72 views

Furnace turns off power to the thermostat

When my natural gas furnace is running for a while and it gets too hot, the limit switch turns off the burner. When it does this, the power also gets cut to my thermostat. This causes the thermostat ...
0
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2answers
39 views

Installing Honeywell Wifi on Ruud Furnace with G wire replacement

trying to install RTH9580. My thermostat has only 4 wires so I am trying to substitute the G wire instead of C wire. On the furnace I put a jumper between Y and G wires and moved G wire to C wire ...
0
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2answers
41 views

Is there a way to measure the output of a single HVAC vent?

As inspired by this previous question, is there a method or device used to measure the output of a single HVAC vent or the output of a single room? I'm imagining some sort of hood device that could ...
2
votes
2answers
88 views

How can I get better HVAC airflow?

I recently purchased my house which was a new construction. Several of the vents are getting poor airflow but the installation company simply said it was normal but I suspect otherwise. I recently ...
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4answers
89 views

Furnace Tries 2 or 3 times before staying on until reaching set temperature

I have noticed my furnace will cut the exhaust fan before lighting or sometimes start heating for a few minutes then stop. A few minutes later it tries again and will stay on until reaching the ...