With the limited info either you don't have heat strips or they are not big enough. If you in fact have a heat pump I would suspect it's not working either.
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Aux heat is only the ac heat strip your furnace is not working check your home thermostat
SOURCE: Hi: Last week, a contractor
That is worrysome about putting refrigerant in hap hazzardly... There is a math style process involving pressures and temperatures in two locations that dictate how much ref. goes in. Anything else shows clueless installer. Too much or too little ref. will not work correctly.
Heat pumps do not work below about 33 degrees outside temp. Above that them, aux heat should not be coming on...
You would need to verify that the system you have is rated for the space that you are trying to heat...
Heat pumps heat more slowly than gas or electric, so using set back thermostat is not recommended. True economy comes from maintaining constant temprature. System has to work to hard to raise the temprature, and eats up savings in efficiency by allowing temp set back.
SOURCE: turn vexar heat pump on and auxililary heat comes on and will not turn off
Might have a bad thermostat or stuck contactor
Testimonial: "I replaced the thermostat right off thinking that might be the issue but the electric heat still kicks on even when the call for heat is turned off.as for the contactor idea I see none in the housing for the air handler so I was thinking it might be a relay stuck but not sure if that would resolve it"
Removal & Installation
Fig. Blend door actuator - auxiliary
(1) Auxiliary line floor pan bracket nut (2 req'd)
(2) Auxiliary housing bolt
(3) Auxiliary housing bolt
(4) Auxiliary housing nut
(5) Auxiliary harness electrical connector
(6) Blend door actuator electrical connector
(7) Screw (3 req'd)
(8) Blend door actuator
To install:
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