For questions regarding a central heating system for the home. The system consists of a furnace or boiler and a method to distribute the heat throughout the home.

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8
votes
1answer
26k views

How do you trigger the HVAC with wiring only?

I have a HVAC that has the usually wiring C R G W Y Pinouts What wires do I need to connect to turn on Heating? What wires do I need to connect to turn on the A/C? Is there a risk of damaging any ...
7
votes
4answers
17k views

Is it an easy task to replace a wall thermostat?

As above, is it an easy DIY job to do this safely? In my research into the above it has become apparant that I should consider replacing the old thermostat with a programmable one for energy savings. ...
7
votes
2answers
11k views

Why are almost all of my house's HVAC floor registers placed near exterior windows?

My current house is a single story built over a crawlspace and all the HVAC registers are in the floor. In all of the larger rooms, at least one (and usually more) register was placed near an exterior ...
7
votes
1answer
1k views

Why did an HVAC installer add this PVC pipe?

We recently had a VERY old central heating furnace replaced and I noticed that the HVAC installer added the following PVC pipe shortly before the inspector arrived: The metal vents were already ...
6
votes
3answers
1k views

How can I stop our duct work “pinging” at night?

I'm in Canada, and our home is a bit older, ~20 years, and the duct work seems to be making a rather loud "pinging" noise at night. I assume this is due to colder weather in general, and the hot air ...
6
votes
3answers
605 views

How can I locate the pump in a wet open-vented central heating system?

Lost: One Central Heating Pump. Reward offered (in reputation points ;) I have a wet open-vented central heating system, and I've turned it on after six months to find the radiators aren't getting ...
5
votes
3answers
2k views

Can I close the garage vent on my furnace?

My furnace duct system has a vent in the garage, right over the furnace. Is it necessary for the proper operation of the furnace to keep that open? I'd hate to waste the money heating up my garage, ...
5
votes
1answer
810 views

Radiators need bleeding regularly (at least once a fortnight) - why?

Last winter, our radiators regularly lost their heat and consequently needed bleeding frequently. I couldn't see any obvious leak. What could be causing this and what should I check for?
5
votes
2answers
4k views

What materials can be used to create cold air returns?

To make a cold air return duct in my wall, can I simply use the studs and drywall to create the duct or do I have to use sheet metal also?
5
votes
1answer
189 views

Are discount furnaces safe to use?

More newbie questions ;-) The house we're looking to buy has an older furnace that "may be manufactured by the Permier/Consolidated furnace company" according to general inspections. We're in the ...
5
votes
2answers
2k views

Does a software-controlled central heating programmer and thermostat exist?

I have a central heating programmer in the airing cupboard (where the hot water tank is). It allows a couple of separate schedules for water and heating separately, and also for manual override when ...
5
votes
2answers
72 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 ...
5
votes
3answers
4k views

Why do I have a cold draft from a return air vent?

I have a draft occurring in my 2 story home, usually on windy days. The main floor is fine, but in the master bedroom on the second floor, there is cold air entering the room from the air return vent. ...
5
votes
2answers
13k views

Why do the radiators in my home heating system get extremely hot?

I have a standard British heating configuration at home - there is one gas heater that provides hot water both for the boiler (and bathroom etc.) as well as for central heating. There is a small ...
4
votes
4answers
433 views

Does using central heating increase water usage?

Its most likely a very trivial question but central heating systems aren't something i'm familiar with, I've had a good dig around on the internet and cannot find any reference that states that ...
4
votes
1answer
2k views

Why are steam radiators used in the USA?

In the UK, we use water radiator systems when the boiler heats the water to about 70°C, this allows the boiler to get most of the energy out of the gas (or oil) by condensing the steam you get ...
4
votes
1answer
185 views

How to disable this timer?

Is there a way to completely turn off this timer?
4
votes
3answers
25k views

Why is it taking so long for my house to heat up?

Firstly, I should probably mention that I'm in the UK... My wife and I bought a house new from a builder over 9 years ago and have had no problems whatsoever with our central heating system in that ...
4
votes
1answer
488 views

What does a manifold do in an underfloor heating (UFH) system and why do they cost do much?

I am trying to understand what the manifold does in a UFH system. It seems to just be an overpriced collection of T joins connect in a row with a basic valve on each. What am I missing?
4
votes
2answers
9k views

Can I convert a radiator to radiant floor heating in a room?

I am purchasing a new home, and designing some renovations to several rooms. The house has a gas boiler and radiators throughout the house. For the kitchen and upstairs bathroom, I will be putting ...
4
votes
5answers
147 views

How to Lower the Ouptut of Oversized Furnace

Questions I would like to lower the output capacity of my furnace if possible. How can I do this? Is it worth doing, or should I just live with it? Is there an easy way? Some ideas: replace burner ...
4
votes
1answer
94 views

What could cause my boiler to provide hot water, but not heating?

My boiler kicks in when the thermostat asks it to, but when my room thermostat asks the boiler to fire up, nothing happens. My room thermostat clicks on, and lights up so I think it can tell the ...
4
votes
1answer
355 views

Is it OK to use old (30+ years) heating oil in my central heating furnace?

I found old steel jerrycans holding ~50 gallons (~200 liters) of heating oil. They were stored in a place where temperature can go below -5°C. Is it safe to use it for heating? If so, should I mix ...
4
votes
1answer
306 views

Is it cost effective to close some heating vents?

I have a central natural gas forced-air furnace in a small (1500 sq. ft.) home. I have an unfinished main room downstairs and a room for storage upstairs that's not being used as a bedroom. Is it ...
4
votes
1answer
8k views

Why isn't water coming out of a radiator in my freshly pressurized system?

I live in an old Victorian with three stories, plus a basement and an attic. I tried to bleed the radiators in preparation for turning the heat on, but was unable to get any water out of the radiators ...
4
votes
1answer
738 views

Should central heating pipes through internal brickwork have insulation?

My house has old (large diameter) steel central heating pipes. These travel through the basement before passing up through the house. My concern is that when they pass through internal walls they are ...
3
votes
2answers
172 views

What to do about furnace that's drawing gas odors into the room instead of heat?

I have a gas furnace. It was heating up the place fine and worked for years until the other day. All of a sudden it started drawing air that smelled like strong gas odors into the room rather than ...
3
votes
6answers
41k views

Gas furnace kicks on then off frequently

A few times in the past week I will wake up to my furnace turning on, hearing a click when it tries to ignite, then turn off. This will happen for a couple minutes before the furnace quits trying. ...
3
votes
2answers
2k views

How can I stop my boiler from making all this noise?

I'd like to preface this post with the fact that I'm a complete diy amateur. I may say stupid things, or things that make no sense. Please feel free to correct me as I'm always open to learn. So, ...
3
votes
2answers
14k views

What is wrong with my central heating?

I have a central heating system that was installed in this house in 2006. Tonight, while I was taking a nap my wife said that she suddenly heard a loud whine/whistle sound that slowly lowered in ...
3
votes
3answers
1k views

Central heating pressure dropping

Some time ago, I asked this question. The problem I had was that the pressure in my central heating system was dropping, and I couldn't find the leak in the system. I'm now convinced that I don't ...
3
votes
2answers
400 views

Is turning the heater off in absence cheaper than holding a low temperature?

Winter is coming and I live in a badly insulated flat in Germany. Outside temperatures are around 0°C at the moment. When I'm absent for a weekend, should I turn the central heating off entirely and ...
3
votes
1answer
5k views

What does C, W, Y and S Plans mean when talking about central heating controller?

I have seen control systems sold as C, W, Y, or S plan, what the difference? Are there any other common setups (These are water based CH systems, so are unlikely to be used in the USA)
3
votes
2answers
656 views

Where can I find central heating system with radiators?

Coming from Europe, I am used to radiator heating systems and thinking about putting one into a fixer-upper house I intend to buy. Where can I find such a system in the North-American market?
3
votes
2answers
198 views

My hot water boiler failed **On** - what would cause that?

I arrived back from holiday to find the house like a sauna, everything in the kitchen too hot to touch, cutlery scalding hot etc. My central heating was on full, and must have been for some days. ...
3
votes
2answers
578 views

Replacing a ceiling register cover

I was replacing an old ceiling register cover in my house but I found the screw hole on one side of the opening is kind of loose. Is there a way to patch up the mount point so the cover is fully ...
3
votes
2answers
65 views

Is it legit to turn a dedicated combi bolier supply into a ring circuit with outdoor socket?

I would like to install an external socket. Conveniently located on the other side of the wall where I'd like to put said socket is the combination boiler which has a dedicated supply from the ...
3
votes
2answers
2k views

Can a cold air return be shared by two rooms?

Can I use the same cold air return duct in a wall between two rooms? For example, the duct would run down the wall between the studs and then could I put the register at the bottom of the wall on both ...
3
votes
1answer
39 views

How much work is involved to change a conventional boiler to a combi boiler?

We live in a circa 8 year old detached house in the UK. We've been having some problems with our heating system, mainly the hot water tank and we're wondering how much work is involved to change to ...
3
votes
2answers
1k views

Hvac Fan only blows in 'fan on' mode while heating

Our HVAC Fan only blows in 'fan on' mode while heating. In other words the fan will not blow in heat mode if switched to "fan auto". Both fan on and fan auto modes work when cooling. See image below, ...
3
votes
2answers
1k views

Can upgrading my boiler save me money?

I've just received my annual gas usage statement. It came as a surprise to me that I'm using almost the average gas consumption in the UK. The average is 16,500kWh and I used 15,000kWh over the year. ...
3
votes
2answers
440 views

Gas combi boiler - left running constantly in cold weather

I've a gas combi-boiler that is generally working fine, but we're getting some seriously cold weather here at the minute (for us anyway) and I've had the odd problem with the boiler starting up when ...
3
votes
1answer
207 views

Where can I find resources on Gas Furnace manufacturers

We are going to replace a 30 year old residential gas furnace. We have estimates for furnaces from Rheem, Trane and Bryant. This is a rental, so we aren't going for the 95% with tax rebate but ...
2
votes
4answers
14k views

Why can't I bleed my radiator?

I am living in an apartment in Belgium. My bedroom radiator is basically useless; it's about 1m long but only the left 10cm ever gets warm. I have been told to bleed the radiator by opening the valve ...
2
votes
1answer
1k views

Cheaper to run central heating sporadically high or constantly low?

My central heating has a thermostat dial ranging from 10 to 30 degrees Celcius. I'm wondering whether it's likely to be cheaper to crank it up to 30, and turn it on for, say, an hour, 3/4 times per ...
2
votes
2answers
963 views

Using a solar system with a condensing boiler for the central heating instead of tap-water?

According to the manual of my AWB ThermoMaster 2HR 28.02WT Condensing boiler, it is compatible with a pre-heating solar system for tap-water only. It even has extra facilities to ensure that the ...
2
votes
2answers
1k views

How do I lower a cold air return from the ceiling for a basement rental?

I am living in the basement level of a rental unit with forced air heat. There are 9 heating vents and one cold air return, all of which are in the ceiling. The air isn't mixing very well resulting ...
2
votes
2answers
58 views

Why won't my heater fan come on?

Central-air heater fan won't run, either in Auto or On mode. The heat comes on, but the fan doesn't. Even with heat switched off, the fan should run if I switch it On. The breaker is on, the wall ...
2
votes
4answers
25k views

What to do about different rooms in the house being a completely different temperature?

I moved into a 30 year old home last December. There is a problem with the HVAC. I have included a very crude drawing of the floor plan The problem is that I can't maintain a comfortable ...
2
votes
4answers
467 views

How do I fix radiators that come on at different times?

We have radiators in all rooms but the ones in the bathrooms come on at different times to the rest of the house. This is particularly annoying when getting up at 6am and stepping into a freezing ...