Skip to main content
8 votes

Is there a way to run my furnace fan intermittently without heating the house more?

I don't think most (any?) of the "dumb" programmable thermostats allow what you want, but I know (because I have one) that the ecobee3 has a setting where you can ask it to run the fan X ...
Huesmann's user avatar
  • 3,680
7 votes

Will lowering the central heating water temperature reduce cost when using district heating?

Tl;Dr; Your radiators may be oversized, but it does not matter. Your radiators have a design temperature and wattage. The "wattage" is expressed per design temperature, usually for three ...
Thomas's user avatar
  • 161
6 votes

What does "Auxilliary heat is running too long" mean in my ecobee

Simply put, a heat pump moves heat from outside air (or better, from the ground, which maintains a warmer temperature through winter than does the air.) This is more efficient than resistive heating, ...
DrMoishe Pippik's user avatar
5 votes
Accepted

How do I add central AC to my existing central heat system?

With a few exceptions, it's impossible to do it yourself because it involves work with refrigerants, and that requires training and certification and specialty equipment and a supply chain for ...
Harper - Reinstate Monica's user avatar
4 votes

How do I add central AC to my existing central heat system?

You hire a professional to do it! This is not a DIY project. It takes a lot of specialized knowledge. There is no gradual learning path for amateurs, and given that most people will only install new ...
jay613's user avatar
  • 39.4k
3 votes

Help identifying the purpose of a central heating valve beside boiler

I think you are correct that the valve helps the boiler to turn off sooner. You typically want a delta T of 15F such that the water has lost 15F of heat after coming back from your zones before being ...
Fresh Codemonger's user avatar
3 votes

What does "Auxilliary heat is running too long" mean in my ecobee

I assume this is a default setting, to provide a warning message in the stated situation. Whether or not it means anything depends on a few things, including whether or not you've had the system long ...
blarg's user avatar
  • 610
3 votes
Accepted

Condensate pump making loud noise

There is something caught in the impeller, or more likely, the bearings in the motor are worn-out.
RMDman's user avatar
  • 31k
3 votes

Will lowering the central heating water temperature reduce cost when using district heating?

For example, right now our radiators are typically very hot in a small area and pretty much cold for the rest, just because that's enough to heat the house. this means you need to bleed the radiator. ...
ratchet freak's user avatar
2 votes

Is there a way to run my furnace fan intermittently without heating the house more?

Nest (which I have) lets you run on a schedule or as a one-time operation. Either way, you are limited to 15-minute increments. So, no 5 minute option (I'd use this too, if it existed). Fan control ...
Tom Hundt's user avatar
  • 311
2 votes
Accepted

How do I wire the replacment motor on my central heating valve?

Your shopping link says "5 wire installation", and the documentation shows five wires and instructs you to phone Resideo if you need six wires for an older installation. This document from ...
jay613's user avatar
  • 39.4k
2 votes
Accepted

Will lowering the central heating water temperature reduce cost when using district heating?

If your walls are well insulated, you'll be losing very little to the outside at that hot spot. If they're not well insulated, there are various products sold for fitting behind radiators to reflect ...
Chris H's user avatar
  • 6,700
1 vote
Accepted

Help identifying the purpose of a central heating valve beside boiler

It's a boiler bypass loop. These can be installed for various reasons. I can't tell which one(s) apply to your case: preheat the incoming cold water a little to reduce temperature fluctuations in ...
jay613's user avatar
  • 39.4k
1 vote
Accepted

Troubleshooting Lennox furnace error code E228 -- failed to calibrate pressure switch

The solution to the problem was simply to replace the pressure switch. It's a dual pressure switch, with a high and low setting. Apparently these are "Costa Rica" switches that tend to fail ...
Rodrigo's user avatar
  • 143
1 vote

Troubleshooting Lennox furnace error code E228 -- failed to calibrate pressure switch

You've been very thorough. You could also verify that the small tube to the pressure switch is clear, but given the switch operates electrically, the tube probably is fine. Many furnaces have two ...
Greg Hill's user avatar
  • 30.8k
1 vote

Help with an older home that I am renting

Window insulation kits can help. In a rental, I would recommend putting up painter's tape around the entire window, taping the double-sided tape there, and securing the plastic to the double-sided ...
Leapee70's user avatar
1 vote
Accepted

Are my condensate drain pain and p trap installed correctly?

The photo does not match the drawing, The trap should be at-least 5 inches tall on the AC side and atleasr 2" less and 2" on the discharge side The photo does not match the text, Both ...
Jasen's user avatar
  • 21.5k
1 vote
Accepted

How to wire ecobee thermostat to central heat pump (two wires only)

You'll need to pull a new cable Your old wired controller communicated with the indoor unit over a proprietary two-wire interface. As a result, you'll need to completely redo the wiring in order to ...
ThreePhaseEel's user avatar
1 vote
Accepted

Central heating loop not getting hot

This is not the answer people would want, but it is what happened. After replacing the mixing valve, and experiencing the same behaviour, I looked for another option. When running nearly, but not ...
Puffafish's user avatar
  • 391
1 vote

From heat load to CFM and where does 400/ton come from?

400 CFM/ton is a rule of thumb because it works in a lot of scenarios. If you really want to know the correct CFM, look at the engineering data for the air handler you're planning to use. For example, ...
KMJ's user avatar
  • 11.8k
1 vote
Accepted

Can I have a shared exhaust flue for a high efficiency furnace and tankless water heater?

Even if material and size of 2 merged tubes weren't an issue, merging the 2 exhausts would still not work. The exhaust from HE gas appliances is normally relatively cool and humid. They require a ...
Ken's user avatar
  • 26

Only top scored, non community-wiki answers of a minimum length are eligible