Questions tagged [heat-pump]

The heat-pump is a type of central heating system that extracts heat from the outside, reversing the process used by a central air system.

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41 views

Tiles on underfloor heating

I am newbie here but been reading a lot of your comments through this website and thought to finally ask my question. I am looking for the right type of tile to go on top of my underfloor heat pump ...
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Can I control a heat pump and boiler heat with one thermostat?

I want to swap out the old air handler for a new one and the old straight AC for a heat pump. I will not be putting a heat package in; I will use my boiler as the emergency heat. The boiler is in the ...
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How can heat pump water heaters be more efficient when they just use heat from heated space? [duplicate]

I understand the principle of heat pumps, and it makes sense that a heat pump / AC split system is more efficient then for example resistive heating for heating a house. In this case, the heat pump ...
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Would a ducted heat pump lose a lot of effeciency if the ducts are installed in an open crawlspace?

Currently I use a woodstove to heat my place (no ducts). I am thinking about installing an air-to-air ducted heat pump to heat my place. I am trying to figure out what are the important factors (in ...
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79 views

Can I use dedicated pool heat pump for heating water in the house?

I'm going to buy a small heat pump dedicated to pools (around 3.5 kW total output). The pump would not be used for 6-7 months a year (autumn/winter); can I plug it into an existing water heating ...
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64 views

Why is thermostat calling for cool when set to heat

I have a White Rodgers 1F97-1277 thermostat. I set it to call for emergency (propane) heat on my York heat pump. Display shows 'Heat - Stage 1'. When I look at the furnace, no heat and no flame. The ...
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HVAC Gas furnace with added heat pump. Thermostat loses power while heating with gas

I have a medium efficiency gas furnace with an add-on Trane air to air heat pump. The heat pump kit is TAYPLUS103A. I noticed that in cold weather when the gas furnace runs, the gas ignites, and ...
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37 views

Run mini-split heat pump heads at different temperatures

I vaguely remember the contractor who did maintenance on our ductless heat pumps two summers ago telling us not to set the thermostats of the two small heads that share an outdoor unit to different ...
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Water protection on top of heat pump water heater

I just got and installed one of those new heat pump water heaters. I was able to plumb the cold and hot fittings to the side because the top has an air inlet and a heat exchanger, but there is some ...
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29 views

Looking to modify behavior of aux heaters

In my condo I have a heat pump with electric strips for auxiliary heat. When the outdoor temperature is quite cold, the heat never turns off. It reaches the set temperature, but keeps running. When ...
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Can you use a heat pump for hydronic radiant?

I want to electrify the heating in my house. It's heated by a hydronic radiant system, fed by a propane boiler. Another loop from the boiler heats a hot water storage tank. The total floor surface ...
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4yr old heat pump doesn't label 24v C wire

I'm used to the gas furnaces, and I still want to swap out this 4 year old heat pump, but it would be too expensive. I recently bought a smart thermostat to try and help with the utility bills, but it ...
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23 views

Comapatibility with dedicated hot water recirculation plumbing

Can this Watts Premier hot water recirculating pump (0955800) be connected to a dedicated plumbing (already intalled in the house) that recirculates water back directly to the tank and does not go ...
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I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it? [closed]

I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it?
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How strong should the air current from my heat pump be, and is there a way to adjust the power myself? [closed]

I've had a heatpump installed this spring. And it really feels like the air strength is not enough to circulate the hot hair around. So the temperature is unequal around the house, like floors being ...
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Heat pump thermostat wiring, can I leave the Optional C terminal empty?

We have an old Carrier Heat Pump system. The thermostat tells me that "C IS OPTIONAL WITH BATTERIES". The thermostat does have batteries. So I can leave the C terminal empty and use the ...
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Replacement HVAC blower motor fails within 24 hours?

My unit is a Carrier Infinity (FE4ANF003T00ABAA) with an ECM 3.0 blower motor. To start, the thermostat reported a “Code 41 - Blower Motor Fault”. I ordered a refurbished motor + control module online ...
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Can a single 8“ flex duct be split into a 5” flex and 7" flex?

Our house used to have a fur-down A/C unit that fed a series of rigid ducts made with duct board. We'd like to replace a vent in our bathroom (5' x 11') with a 5" flex duct. We'd like to ...
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How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace

We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding ...
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Can heat pumps condensation line be run in wall?

We're adding an addition (garage with master suite) and we currently have a couple of drain lines installed on that side of the house but they need to be moved to install the addition. Typically, they ...
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How to calculate whether it's worth turning on a fan to bring warmer air to a heat pump hot water heater?

I have 4 new Rheem 50 gal heat pump hot water heaters being installed in the basement of my home/multiunit property that is a 4-unit building (one heater per apartment). Generally speaking, the attic ...
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How to connect nest thermostat e for American standard heat pump 2005

current wining We have a 2005 heat pump. I tried b wire to nest C wire but it is not working
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Thermostat upgrade delivers heat instead of cooling

QUESTIONS The apartment heatpump delivered cool air (16 degrees delta). The thermostat was changed out with a Radiothermostat CT50. CT50 switch configuration setting include HP (Heatpump) and ...
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86 views

Electric heat pump water heater with solar power vs. gas water heater

I am getting ready to replace my current hot water heater - it is a ~15 year old tank gas water heater so I want to be prepared in case it breaks. In the summer (when I am not using gas to heat the ...
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mobile all-in-one airco unit evac via unused chimney?

We've begun to consider options to install some form of airco in the attic which serves as our bedroom (the higher part; South) and my office (a lower part, North). The piece runs the length of the ...
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47 views

HVAC blows fuse when cooling kicks on

I have Rheem HVAC system that is about 12-4 years old (its an R22 unit). Today it started blowing the fuse on the board when cooling kicks on. The tstat shows a message that says power failure, then ...
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45 views

Furnace Displays Heat Pump mode when AC is running

I have a new Trane S9X2 furnace I purchased this winter. I want to make sure that everything is setup correctly now in the cooling season. I noticed that the furnace displays "HP1" when the AC is ...
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550 views

Minimum length of mini-split AC line

I was considering buying a cheap mini-split AC unit to cool a small room (10ftx10ft) over the summer now that we spend more time working from home. There are several units on the market. However I'd ...
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48 views

Heat-pump style AC is not putting out cool air

I live in the Northern area of the US, and I have a heat-pump style AC unit. So there is an AC unit with big fan outside my house, and there is a furnace in my attic. I bought this house 10 years ago ...
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Heat Pump doesn't work in AC mode, but heat mode is fine

I have a heat pump for my house's heating and cooling. We had our first hot day of the year last week, so I switched it to cool mode (heretofore it had always been in heat mode). When in cool mode, ...
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ductless air handler install

So I am about to embark on an install of a 6 zone ductless system and I have 2 questions around installing the air handlers in each bedroom. I am using a branch distribution box which needs to be ...
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Can I keep my existing ductwork when replacing a furnace with a heat pump and air handler?

I currently have an over-sized furnace for my home square footage. I'm happy with the duct's performance, they are quiet. The furnace is 27 yo and I'd like to replace it with a heat pump and air ...
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198 views

Old Rheem rhqa 1000 to thermostat wiring help

I cannot figure out how to wire my 30+ year old AC to my lux dmh110a thermostat, I do not have the old thermostat to reference. It seems to be 4 wires coming out of the air handler and to the ...
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What is the incremental benefit of AC canned outdoor coil cleaner?

I understand that it is possible to simply clean the AC / Heatpump coils with a gentle water spray (cooling fins are delicate). I found a can of Web coil cleaner and emptied it into 3 condensors. I ...
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Trouble with identifying wiring for heat pump setting up Nest

The home I moved into has a Honeywell thermostat controlling an Amana heat pump. I am trying to replace this with a Nest thermostat instead. Here is a photo of the wiring for the existing thermostat ...
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166 views

Integrating existing Hydronic Radiant with new Hybrid (dual fuel) Heat Pump (forced hot air)

I have an existing simple Hydronic baseboard radiant forced hot water heating system running off of an Oil Boiler. I am adding a duel fuel (hybrid) heat pump to the house. Here's what I want: When ...
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100 views

Solar water heater vs Heat pump for heating water?

I'm debating between installing a solar water heater vs. a heat pump for supplying hot water to my house. The house is in Bangalore, India - we have about 300 days of sunshine in a year. My estimate ...
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47 views

In a multi-zone mini-split setup, how do you heat heat rooms without an evaporator?

I recently asked for recommendations for multi-zone heating in a small home (intended for college students). The responses overwhelmingly recommended multi-zone mini split systems. I fully agree, my ...
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Why don't HVAC service people want to use outdoor temperature sensors to increase efficiency?

Here in central Virginia, most houses use heat pumps with electric auxiliary heat. I have inquired with several different contractors about installing outdoor thermostats on my units to 1) disable ...
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29 views

Air Conditioner Cooling Ability

Is a 9000 BTU heat pump roughly equivalent in cooling ability to a 9000 BTU window air conditioning unit? If not, what is an approximate way to "translate" between the two, in order to obtain a heat ...
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How can I use a pre-installed A/C unit for heat?

I just bought a house with a relatively two-year old A/C unit (installed 2018) and a natural gas furnace connected to central air. I'm interested in using the A/C unit as to heat the air in lieu of ...
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96 views

Relay requirements for Heatpump Thermostat

I would like to understand if three 3-relays are enough to control a heatpump. As I understand it, 24V AC is applied to: Green: Fan Yellow: Cool White: Heat When designing a network connected ...
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456 views

Heat pump Not turning off

The temperature outside is about 20° my thermostat is set to 68° I have a heat pump unit it does not turn off once the set temperature is reached it does not go above 68° but maintain 68° and the unit ...
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366 views

Upgrading a heat pump to a larger heat strip

Our heat pump is having trouble keeping up on colder mornings. It's not just defrost kicking in, as it's blowing cold (less than the target temperature) for an hour or two some days. The heat strip ...
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137 views

HVAC Furnace - Adding C Wire to Older Wiring Style

Hello! Trying to add a smart thermostat to an old system (currently running a mercury thermostat on it). There is an extra wire (orange) which you can see both inside the thermostat and also in the ...
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Environmentally friendly methods for heating a large addition

I live in Southern California, and am writing this at my desk in the large family room, which is about 45 sq.m. (500 sq.ft.). This room was added on to the house, and our natural gas furnace doesn't ...
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262 views

Zoned 2 stage heat pump system, aux heat not engaging

Homeowner here...I have a 2 stage heat pump split system with the ducting zoned for 2 zones. The units are as follows: Compressor: Goodman GSZC16 heat pump Zone control board: Honeywell HZ322 ...
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Heat pump causing high humidity in house when in heating cycle

I have a heat pump system that is increasing the humidity in the house when it is in heating mode. So much so that when the heat pump comes on condensation starts to form on the windows. It only ...
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Heat pump not working after rain

A couple weeks ago, I had a Goodman 3 ton heat pump split system put in. At 5pm hours today, I was outside near the heat pump and noticed that it was functioning properly. At about 6pm, there was a ...
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What causes a heatpump to freeze?

A heatpump is used to cool a home in Florida. A relative noticed that the temperature was 90 degrees and that the evaporator (see photo) was sweating. She thinks she heard a piece of ice fall break ...