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Re: HEAT PUMP WILL NOT KEEP UP WITH THERMOSTAT SETTING
Heat pumps in cold climates suffer a number of limitations stemming from the fact that they are designed for air-conditioning applications. As climates become cooler and heating becomes more of the primary HVAC function, one may find that conventional heat pumps lose capacity and do not satisfy the load of the conditioned space. In colder temperatures, a conventional system’s need to defrost can further detract from heating performance. The use of resistance heat or fossil fuels to supplement or replace the vapor cycle. The additional use of supplemental heat to temper cold air blowing into the space during defrosts. As it gets colder outside, the delivery air temperatures inside begin to fall when no supplemental heat is being used. Supply air temperatures that are warmer than the return temperatures add heat to a space, but discomfort occurs when these supply temperatures drop below skin temperature. The air movement can feel cool or even cold. While the heat pump may be operating exactly as intended,the consumer will desire a more comfortable environment.
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If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.
Check at your thermostat for a supplemental heat setting. Your repairman was right in that a heat pump will not effectively extract heat from the outside when the temperature is very cold. The supplemental heat setting allows the heat strips to be used, operating like a normal electric furnace, when it's too cold to work as a heat pump. Take a look, and re-post if you need to.
Best regards, --W/D-- Please feel free to rate this solution. Thanks.
Unless the system was ever programmed to turn on and off at set times,-- the setting of the clock shouldn't interfere with its putting out heat.
Is this a heat pump / AIr conditioner unit? and is it real COLD outside?
Here are some comments on heat pumps:
Remember, for an air conditioner to PUT OUT HEAT-- (as HEAT PUMP) -- there has to be some HEAT outdoors, to make the process work... So-- ask yourself-- How cold is it outside? How cold was it outside, the last time that my AC worked good as a heat pump?
Possibly the coil outside is all frosted up?--
Shutting it off, and letting the outside coil defrost might help-- but-- the basic law of physics still stands: To get heat inside-- there has to be some heat outside! (Likely your unit won't give you much heat inside, when it is below 50 -- or for sure-- below 40 degrees outside!)
Give us a few temperature readings- inside and out, and then gives us clues as to what is running, and what is not-- maybe we can trouble shoot deeper. Is the compressor running?-- does it sound like it is actually working-- or just running-- sort of like 'running but not really WORKING'?
Remove the cover of the circuit board and controls on the outside unit. Some units have a thermostat that allows you to set the temperature at which it switches to the second stage of heat. Set that for about 34 degrees.
Definately get this checked out. Some thing has shorted just enough to let voltage "Feed back" and keep the fan running. Could be capacitor, wires rubbed through each other, etc. A reset is a safety that is used when there is an overcurrent or over pressure situation. No reset set for this situation.
There is always an outside chance that if you touch the unit while standing on wet ground, you may get shocked. I firmly believe that something is allowing power to the fan in a feedback condition so don't let this go as it may cause damage to other parts.
Good Luck and let me know how you make out on this.
It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.
ok...where to start.lol ....the thermostat is just a switch.It will tell the unit to run or not run.if you measure the temp with the heatpump running,the air is warmer than 68 but it feels cool to you because your body is 98.6.The unit will run more often and for longer periods when the temperature drops outside for a few reasons.First,your house has more of a load to heat,meaning you have more heat loss because of the difference in temperatures outside and inside.Second,your heat pump pulls heat from the outside air.The colder the air outside,the less btu's for it to pull.If you have anymore questions email@example.com Hope this helps,Dave