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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What is the life expectancy of a heat pump? When does it usually need to be replaced? [closed]

We have installed a Hoval UltraSource B compact C (8.11/200) from 2021. I have heard rumors that a heat pump must be completely replaced after 15 years, because a lot of high-tech and electronics that ...
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Why does my heat pump "blow" at warm (even hot) outdoor temperatures? Should not it be inactive?

We have a Hoval UltraSource B compact C (8,11/200) air/water heat pump in our house. I have noticed in warm weather that occasionally my heat pump "blows" outside. I then thought that my ...
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Enabling heat-pump load shedding when running on generator power

I electrified my heating system by replacing my air conditioning condenser with a heat pump. I hired a contractor to install a Trane variable speed heat pump and matching air handler. The air handler ...
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Using water cooler for CNC laser as residential heat pump

I want to save money on heating bills. Residential heat pump systems cost thousands of dollars, which I can't afford. I am considering using a heat pump marketed to chill water for cooling CNC lasers (...
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2 answers
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Heat pump size, given existing gas furnace size

If I have a furnace with some BTU rating, and given the outside temperature, is there a way, or a web site, or whatever, that would tell me what rating an air-source heat pump would be need, to supply ...
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Where can I find the efficiency of my heat pump with respect to temperature?

I can heat my house either with a standard gas heater, with a documented efficiency of 0.9, or with an heat pump, with a standardized coefficient of performance (Seasonal Coefficient of Performance) ...
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How to configure Honeywell combine W2/AUX/E terminal for Emergency heat?

I have a Honeywell RTH9585WF1012 to control my forced air furnace system which has: Cool: 1-stage heat pump Heat: 1-stage heat pump (same) + Expensive emergency gaz heat from furnace. Older ...
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5 answers
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How can I protect a frozen heat pump in cold weather while waiting for service?

Yesterday I noticed that my Carrier heat pump was struggling to keep up with my thermostat settings inside the house. It was around 35°F (2°C) outside, I had the thermostat set at 72°F (22°C), but the ...
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Honeywell hz322 heat pump with aux heat

I get heat and aux separately but not together. I checked the 322 and it's calling for both, but only heat light is on. I only have w1 wired... Is this the problem? I see is says to tie w1 and w2 ...
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Thermostat keeps switching on aux heat unnecessarily

I have a basic dumb Honeywell thermostat (TH5220D) that very eagarly switches to aux heat (electric) when set above 73˚F, despite outdoor temperatures being nowhere near low enough to preclude ...
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Would a long refrigerant line reduce the efficiency of a heat pump?

I recently installed a multi split heat pump (air conditioner). One of the indoor units work pretty fine, the line set is about 8meters. The other unit, which is supposed to be even stronger but has a ...
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types of air conditioning units

I recently moved into a ~670 sq ft condo and it has an old “all in one” HVAC unit. It's currently in a closet, but I would like to reclaim that closet space and move all components to the roof. I ...
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How to balance in-floor heating with forced air heat pump

Background: we recently bought a two story house on a slab. It has in-floor heating run by an electric water boiler. It also has forced air run by a Trane heat pump. As we live in Canada its starting ...
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Is there a way to have one thermostat control a heat pump and a 3 zone hydronic system?

I have two heating systems that are independent of each other. One is a 3 zone hydronic system with 3 thermostats controlling a pump controller. The second system is a air to air heat pump without ...
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If I live in the US Southwest, would a heat pump or conventional dryer use less energy?

Suppose I live in Poway, CA (weather), where temperatures are roughly between 50 and 90 F throughout the year and relative humidity is generally between 40 and 60%. With climate change the highs have ...
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Heat pump condensation drainage re-use potability or toxicity

I recently had my older style air conditioner replaced with a newer style high-efficiency electric heat pump. Working great so far. One thing that is different is that it apparently extracts quite a ...
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Heatpump Compressor Hardstart Device: What is the active working mechanism?

The original compressor-heatpump starting issue is documented at Air-conditioner fan & compressor fails to start. I installed a new capacitor before the technician arrived. The HVAC technician ...
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1. Do I need to connect the neutral wire to a Raypak 5450 pool heater or just marrette it?

This is for a Raypak 5450 Heat Pump pool heater.
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6 answers
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Can you install window AC/heat pump on floor to be used as heat pump?

This is more of theoretical question, not a practical, but it might be useful for some (we already have a system). I live around Auckland, NZ where heat pumps are very popular, typically ran for about ...
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Conduit for Outside AC\Heatpump

Need to run conduit for a new AC\heatpump. Main panel is in the garage. Looking to go through the wall to outside pretty much right at the panel and run it all on the side of the house. Outside the ...
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Can heat pump's circuit board burn out from a large short electrical spike?

I have a ducted central heating system in my residential home in New Zealand (220V) installed 18 months ago. The system is powered by a large outside unit. Last week the outside unit has stopped ...
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Installing a heatpump in a apartment complex and splitting usage fairly

I live in a shared apartment complex with 6 apartments (~400m2) which are currently being heated by 6 individual gas heaters and paid individually, you pay what you use. We are interested in investing ...
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How much extra costs because of broken heat pump?

New house. Underfloor heating. First signs of winter 2020. Heat pump starts showing errors and stops working. Provider and repairman need 4 months to figure out that the heat pump must be replaced ...
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Is there something wrong with heat pump + Empire furnace?

I've been asked to look into A/C for a 1600 square foot building at our lodge. The gas furnace is old and tired, and on its last legs. There is a top floor that is 2 rooms subdivided, and a well ...
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Nest Thermostat wiring for heat pump

I am trying to replace my Honeywell Thermostat that is connected to a Honeywell EIM with a Nest Thermostat. I only have a 4 wire (G,B,R and W) ran from the EIM to the thermostat. My understanding is I ...
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Heat Pump Compressor not turning on in heat mode

UPDATE 29-MAY-2021: So I have it working now, after playing around with some of the settings in both the Nest Thermostat and the Zone Control Panel. In the "Pro Setup" section of the Nest, I ...
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Why do heat pumps use a separate “reversing” signal from thermostats?

Thermostats use a W signal to call for heat and Y for cool. For heat pumps they also have an O or a B signal to "reverse" the pump into the appropriate heating or cooling mode. Why two ...
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How should I connect new thermostat wires to my heat pump?

I need some direction on troubleshooting my HVAC heat pump. I have recently purchased an older home with a newer heat pump was installed. There was no power to the thermostat. Called repairman and he ...
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Heat pump not draining; barely cooling & smells bad

I have a Panasonic heat pump system for heating and cooling. The inverter unit is an R410A. I can't get access to the outdoor unit (I'm a tenant and it's in another part of the building). This is my ...
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Honeywell RTH9585WF thermostat behavior with heat pump and Emergency heat

I just installed a Honeywell RTH9585WF1012 to control my forced air furnace system which has: Cool: 1-stage heat pump Heat: 1-stage heat pump (same) + emergency gaz heat from furnace I have a fossil ...
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1 vote
1 answer
65 views

Tiles on underfloor heating [closed]

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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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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2 answers
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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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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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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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1 vote
1 answer
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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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2 votes
1 answer
99 views

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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2 answers
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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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2 votes
1 answer
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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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0 votes
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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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1 vote
2 answers
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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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