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There are 29068 articles in 2923 discussions. See the most recent and the best rated articles in HVAC Discussions

The most recent discussions

R744 / CO2 refrigerant.


November 16, 2017, 8:53 am

Hi, I have been reading for years about the advent of R744 as a refrigerant. I understand that Mercedes Benz and/or BMW have elected to use R744 in some i n-vehicle air conditioning systems. Asi... Read more »

carrier 3 wire pilot gas furnace random lockup, pls help


November 15, 2017, 7:11 pm

hope someone here could offer some hints what is next for me to try. Sorry for long description old Carrier gas 394GAZ048125AAEA, 3 -wire-igniter furnace (bi-metal flame s afety switch) . Sever... Read more »

Heat Pump Aux Heat Indicator


November 13, 2017, 5:06 pm

I'd like to install an LED indicator lamp beside my heat pump thermostat to alert me when the resistance heat is on. Which terminals on the thermostat would I use to do this? Read more »

Installing a robertshaw retrofit kit


November 11, 2017, 8:37 pm

This is a day and night furnace with the 3 wire pilot and control board my question is about gas 1 gas 2 and gas3 wires in control board I know gas 1 it has 24 volts gas 2 is a common no sure abo... Read more »

having a problem with hook up


October 26, 2017, 2:45 pm

I have a electric furnace in a place I'm buying Someone stole the blower mo tor and I've put 3 different motors in it and blow all 3 I ordered another 1 but don't want to blow it up to With winter... Read more »

Help Identifying Unit


October 23, 2017, 7:14 pm

I have a unit mounted on a BBQ Smoker. The only info I can find on it is Ho neywell. I borrowed this smoker for the volunteer fire department fund rais er and it caught fire and burned this gas uni... Read more »

Central Cooling Question


October 16, 2017, 3:29 pm

Over the weekend I had a chance to tour a large central chiller plant at a university. They had several electrically driven chillers with centrifugal compressors. It was all very high tech with... Read more »

Is it legal to sell Freon 22 on Craigslist?


September 20, 2017, 1:42 am

I'm in Oregon, USA. I have about 20# of Freon 22 that I've had for decades. Don't think I'll ever use it. I'm getting conflicting information on whether it's legal for me to sell it. It's probab... Read more »

Brandon new WindowS AC


September 1, 2017, 2:15 pm

New LG 12000 BTU unit set at 72. Cools 500 square foot den well. However it cycles every 3-5 minutes. Is this normal. On 3/off 1 Read more »

6AWG connecting to a 30 Amp breaker


August 16, 2017, 1:52 am

I am replacing my air handler in the attic with a newer and more efficient model located in a closet on the ground level. I will start at the main panel for (hopefully) some clarity. 60 Amp breaker... Read more »

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The best rated discussions

6AWG connecting to a 30 Amp breaker

rating: 5

I am replacing my air handler in the attic with a newer and more efficient model located in a closet on the ground level. I will start at the main panel for (hopefully) some clarity. 60 Amp breaker... Read more »

Oil furnace flue has green stuff dripping down?

rating: 5

I have a newer 2002 80% efficiency oil furnace. I do not know much about HVAC but I'll try to explain as best I can. A steel exhaust flue extends essentially straight up towards the roof. About ... Read more »

DIY ground source heating

rating: 5
  [ 2 ]

Hi folks, I've been thinking about a simplified ground source heating setup for DIY and would value constructive and educated input. You hopefully already know how ground-source heating works: Water ... Read more »

Furnace Problems - Blowing cold air - Please help

rating: 5
  [ 2 3 ]

Hey guys, I know nothing about how the furnace or heating work in general, but I will try to explain my problem and I hope someone will be able to help me out. So here we go... I turned on the heatin... Read more »

No power to Thermostat + Electric baseboard heater

rating: 5

I have a electric baseboard heater in my bathroom which does not work. I just bought this house, so no idea if it ever did. I opened up the thermostat and checked to see if the thermostat received an... Read more »

Advantage of Azeotropes?

rating: 5
  [ 2 ]

I can figure out what azeotropic refrigerants are, but not why. What's the advantage? Or is is just a way to get the boiling point of non-CFCs to match the older CFC single-component refrigerants?... Read more »

Installing a robertshaw retrofit kit

rating: 5

This is a day and night furnace with the 3 wire pilot and control board my question is about gas 1 gas 2 and gas3 wires in control board I know gas 1 it has 24 volts gas 2 is a common no sure abo... Read more »

Cox Radiant Heater

rating: 5

Looking for a supplier for Cox radiant heaters. I have a factory with a couple dozen units. I need parts for several. Thanx in advance. Read more »

Price gouging

rating: 5

Some idiot in the legislature has decreed that people are not allowed to charge more during times of emergency. As a result, there is no profit motive to buy a generator, or drive to work when it's ... Read more »

Flame Rods Coleman furnaces.....

rating: 5

I have a 13 year old Coleman nat gas furnace with a two stage gas valve and igniter, not a pilot light. I've only owned this house for 4 months but the service records on this furnace seem to sugg... Read more »

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