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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1answer
28 views

Is there a small ductless condenser to fit in A/C sleeve?

I own a 350ft studio co-op unit which currently has an old AC unit and two electric baseboards for heat. I was thinking it would be nice if I had a single high hat in the middle of the room connected ...
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1answer
32 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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26 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
84 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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151 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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1answer
113 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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1answer
17 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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1answer
6k 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
73 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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1answer
53 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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35 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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1k 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 clean it ...
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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
21 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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1answer
212 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
979 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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14k 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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345 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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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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99 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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43 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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3answers
605 views

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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1answer
48 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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1answer
85 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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2answers
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
115 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
39k 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
47 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
43 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
42 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
227 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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3answers
171 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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1answer
34 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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1answer
38 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 ...
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Heat pump pool wiring

Wondering if anyone can help me here. I have a heat pump for my pool. It says min fuse/breaker 50amp and maximum 60amp. So I have a couple options and questions I was hoping someone can help with. ...
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0answers
66 views

Fujitsu Halcyon: Custom Air-Filter (C.F.M.)

I'm trying to make airfilters to fit over my Fujitsu Halcyon Wall Mounted heating & air-conditioning split system. I'm talking about the indoor unit specifically. The wire mesh screens that come ...
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Do recirculation pumps work with water source heat pumps?

Our plumber has installed the recirculation pump but, when it is on we only have tepid water. When we unplug it we have hot water. Just wondering if recirculation pumps are meant to work with heat ...
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57 views

Heat Strip in Heat Pump

We had a/c here last week to fix a capacitor on our a/c unit and signed up for their maintenance program. They came today to clean everything and do checkup and said the heat strip in our heat pump ...
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4answers
385 views

Efficiency of a heat pump water heater during the winter

In my understanding, heat pump water heaters pump energy from the room around the water tank into the water. Clearly, this must be energy efficient in the summer time, especially if I am using AC ...
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10 views

Manually Toggling Heatpump Reversing Valve to enable cooling

Background A Radiothermostat CT80 fails to signal heatpump cooling, so jumpering the RED node with the GRN (Fan) and YEL (Cooling) node has successfully enabled cooling. The weather became cold, ...
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2answers
114 views

Is HVAC device a heat pump?

A Florida HVAC device keeps a bank of storage units frosty in the summer time. A wifi thermostat is desired: a determination has to be made as to whether the device is a heat pump or not. The ...
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264 views

Do I need a new thermostat?

This is my first winter in this home, just moved in this past July. So I get my electric bill and it's been running more than usual every since I moved in here. It wasn't too much more so I just paid ...
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1answer
37 views

Will coefficient of performance rise in the future for heat pumps?

I can see there are heat pumps with x > 4.1 SCOP, which is great! Q: But will this get better in the future? Ex. in 10 years? New type of heat-pumps? Or are there any psyhical limitations, that ...
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36 views

Heatpump Wiring Color Convention

A heatpump thermostat is to be upgraded. I am unsure of: Which color wire is the Common (thought to be BLUE) Where should the brown wire be connected? (B node?) Is the 'B' node in the photo ...
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107 views

Carrier infinity 25vna heat pump utility curtailment

I have a newly installed infinity greenspeed hp system and the utility is trying to figure out how to control the outdoor unit in heating mode. It's my understanding that the utility sends a signal ...
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54 views

How can I deal with a heat pump condenser producing lots of water?

Heat pumps was replaced in 2017. North Florida has had moderately cool weather (50-60 degrees F) recently. I noticed water underneath one of the units. Is the water pooling normal? If yes, why? If ...
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243 views

Best Way to Heat a Ductless Multi-Level Home

I just bought a home and it desperately needs an update to its heating. It currently has baseboard electric resistance heaters in every room. There is no duct-work in the house. We're in cold humid ...
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22 views

Heat pump blower motor cycles on/off after running 140 seconds

Standard Trane split heat pump, condenser outside blower inside. Usually the system will run normally but after 2 min 20 seconds the blower motor will cycle on and off randomly for 20 seconds. Then ...