easterner asked:

We have an air to air (i.e. not ground source) heat pump with additional heating coils. I have replaced the filter and reset the thermostat. The fan works but the unit will only pump our hot air. Any suggestions on which part might be affected?

Question posted courtesy of: Mathew

Xar asked:

A heat pump on a house operates with a COP that is 35% of the theoretical maximum, between exterior and interior temperatures of −12°C and 34°C. How much work must be done on the heat engine to supply 2200 J of heat to the interior of the house? (in J)

Thus far, my two responses of 5.1E3 J and 4.2E4 J has been incorrect :(. Can anyone help ?

Question posted courtesy of: Valerie

Dick Tater asked:

I have a Kenmore heat pump that yesterday stopped heating. I thought that it went into reverse mode to defrost. However, this was not the case. Air was coming through the vent, but when I looked at the top of the heat pump, the fan was not turning. This had me confused. So, I know that the main fan is not working, but what about the lack of heat. I know that heat mode is reverse AC mode - could it be a Freon leak?

Question posted courtesy of: Ethel

zarn asked:

We’re looking at eco-friendly heating (central heating & hot water) for our home. We plan to use a solar panel, but given variable weather in the UK will also need another source. A heat pump looks very attractive, especially if used with carbon-free electricity, which we have.

Is there any reason that this isn’t a good solution?

Are there any disadvantages compared to ground source heat pumps?

Question posted courtesy of: Jack

thepavman asked:

I have a Friedrich PTAC model #PDH15K - manual indicates we can use this with any “24v single stage remote wall mounted thermostat”.

I want to use a Hunter 44360 programmable thermostat, the specs say it can be used with a single stage heat pump.

The PTAC has the following connections specified in the manual:
C - Common Ground
W - Call for Heating
Y - Call for Cooling
R - 24v Power from Unit
GL - Call for Low Fan*
GH - Call for High Fan*
B - Reversing Valve Energized in heating mode
*Either ONE of GL or GH may be hooked up, they don’t both have to be used.

The thermostat has the following connections:
G - Fan
RH - 24 Volt
RC - 24 Volt Cool
Y/O - A/C compressor
W/B - Heating
Y1 - Heat Pump compressor

I called Friedrich tech support. They insist this needs SINGLE STAGE heat pump thermostat. I called Hunter tech support, they insited this must be multi-stage heat pump due to the wires I described to them.

What wires need to be hooked up to which terminals?

Question posted courtesy of: Bessie

need help asked:

It is 19 degrees out and I have a heat pump that is not working efficiently (or so I think). I have the temperature set at 75 degrees but it is only heating at 68 degrees. Is this pretty normal for heat pumps or do I need mine checked by a technician?

Question posted courtesy of: Reginald