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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31 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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4answers
55 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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37 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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16 views

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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2answers
66 views

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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44 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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2answers
239 views

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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155 views

Why is my Heat Pump fan not turning in cold weather?

My heat comes on and you can hear the condenser unit come on as well. However the fan is not turning? The outside temp is 30 degrees? Is this normal? Can anyone share some wisdom on this? Thank ...
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2answers
47 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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1answer
7k views

Honeywell RTH6500 WiFi Thermostat wiring questions for a heat pump

I'm trying to install a new Honeywell RTH6500 thermostat on an old heat pump system that has regular plus emergency heat and the closest matching diagram says to put both the white "W2" wire and black ...
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1answer
77 views

Is this humidifier properly installed?

Has anyone seen a humidifier installed this way: humidifier installed to side of air handling unit (hole drilled into side of AHU and discharging humidified air directly into the AHU). Always thought ...
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60 views

Hook up new thermostat

Top brown picture is my old thermostat white is the new one , do I have it wired correct? On out side unit we have replaced motor, fuses, compassator ,cc contactor ,relay . We have a heat pump. But ...
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29 views

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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If my heat pump does not have a neutral, do I still need a neutral wire?

I had a friend wire 10-3 line for a new heat pump. He connected the red and black conductor wires in the house to the 2-pole 60 amp breaker and the neutral white to the neutral bus bar. The outdoor ...
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15 views

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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1answer
36 views

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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3answers
258 views

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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1answer
241 views

Coleman 6230-901 outdoor unit fan running slow (and continuously)

I have an old rental mobile and the heat pump is operating normally, except the outdoor unit fan is running all the time (unless the breaker is off), and it runs very slowly. The run capacitor ...
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1answer
31 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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1answer
1k views

Air handler turns on even when set temp is reached

My HVAC is a heat pump system, the air handler inside is a Goodman aspf183016ea. The whole system/house is about 3 years old, and is all electric. I recently moved into the home and noticed that the ...
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2answers
15k views

why does my heat pump wiring diagram show 7 wires going to the thermostat but the thermostat only says it needs 5?

Here is a link to the wiring diagram for my heat pump. The thermostat that I am planning on buying has the following terminals C, G, Y, O/B, RC, R, Aux, E, and L. The instructions say to jump the RC ...
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222 views

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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478 views

Direct Wiring (bypass thermostat) of heatpump cooling

Last September my CT80 radiothermostat would not signal cooling despite the measured temperature exceeding the temperature setpoint. It would be nice if a relative could manually switch the cooling ...
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1answer
48 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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2answers
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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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2answers
109 views

Thermostat White-Rodgers 1F82-261 switches to stage 2 heat for no apparent reason

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat used is the White-Rodgers 1F82-261 which supports 2 stages of heat. When using regular ...
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3answers
61 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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1answer
127 views

Is it possible to wire an electric radiant floor as a heat pump in my Nest thermostat?

I have a standard gas furnace, but recently installed an electric radiant floor in one room. I have a transformer at the electric floor and a regular low voltage thermostat wire to my Nest thermostat. ...
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1answer
37 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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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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2answers
86 views

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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22 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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56 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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2answers
2k views

Should my a/c have some sort of a drip pan (photo)

I've got water (condensation) dripping from this "radiator" in my a/c. It's slanted so MOST of the condensation drips along the radiator and into a drip pan. I'm wondering if I just need to ...
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2answers
50 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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1answer
26 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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0answers
41 views

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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54 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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140 views

No Hot water to Shower and Taps furthest away from hot water tank

I have this setup coming off of my hot water tank. Recently I started getting only luke warm water to the taps and shower furthest away from the water heater(#9 & #10), also sometimes my cold ...
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2k views

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 ...
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2answers
160 views

Is it OK to stop the indoor blower during heat pump defrost on split-system heat pumps?

The traditional North American split system heat pump (ignoring "dual fuel" systems for now) relies on a backup heat source to provide both makeup heat during low-temperature (below the system balance ...
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7answers
42k views

Air handler condensation draining problem

For the life of me, I cannot figure this out. My air handler and heat pump were installed in 2006 and work great. For the first summer since I've owned the home, condensation started to not drain ...
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1answer
51 views

Loud noise from outdoor unit several seconds after AC turns off

I haven't been able to find anyone online with quite this issue... I have a Carrier heat pump system, and through the winter it would often make that torpedo noise when heating the house (I later ...
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1answer
47 views

Running AC/Heater when washing a cleanable filter

I have a heat pump/AC system with a washable air filter. I was told to clean the filter out and run water through it once a month. He told me to let the filter dry for 3 hours before replacing it. I ...
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1answer
43 views

External Air Conditioner Condenser Capacitor replacement

I have a couple of questions about testing and replacing the capacitor on my home heat pump external condenser unit. 1. How can I reliably test the capacitor (what tools do I need?) 2. What safety ...
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3answers
319 views

Is there a significant risk of CO2 buildup with a ductless heat pump A/C?

It just occurred to me that if I install a ductless heat pump to cool the air in my house's bedrooms in the summer, the unit will be cooling and dehumidifying the air - but not introducing any new ...
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198 views

Is there such a thing as a DIY heat pump or mini split

I wanted to ask this question to the community. Is there a legal way to install a mini split or heat pump without having an EPA license? I have seen similar questions asked several times or ...
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Can a homeowner without a Section 608 EPA license legally connect his own gauges to his own air conditioner if the unit uses 410a refrigerant?

It has been suggested by at least one moderator on this site that EPA Section 608, which restricts who can purchase and handle refrigerant, including who can connect a set of manifold gauges to a unit,...
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39 views

Mitsubishi Hyper Heat Models Capacity Weirdness

Why do some of the h2i models not have 100% capacity at 5 degrees like advertised. These models, in fact, don't even list a 5 degree sizing, but drop off at their 17 degree like traditional heat pumps....
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39 views

What is the name for fixed metal venetian blinds?

I am about to build a canopy/enclosure for heat pump outdoor unit to protect it from strong wind and angle rain. It needs to cover the unit all around but still allow free air flow. Ideally the walls ...