The unit is a 2.5 ton variable speed unit. The heat strips come on to help heat but as soon as the heat reaches correct temp they "kick off" and the unit keeps running off course but....the unit is not putting out very much heat. Normal heating should put out like 98 degrees at the vents and this is putting out like only 72. Heat strips and unit come off and on a lot. Why is the unit not putting out very much heat without the heat strips?
Full of Freon. No leaks, been pressure checked. Any help appreciated?
Try ohming heat strip maybe broken replace sequencer maybe defective or check limit switches
The heat strips are what is called Auxilary or supplemental heat. If your t-stat is set 2 degrees or more then what the actual temp. in the house is or if the system runs 10 min. or more nonstop they turn on to help the Heat pump catch up.Then shut off within 1-2 degrees of set temp. Heat pumps have a balance point of about 30 degrees outside air temp. If it is colder then that it will run almost nonstop and the colder it gets the lower the air temp. it puts out. If you are below say 15-20 degrees outside it would be better to switch your t-stat to emergency heat. That shuts of the outdoor unit and runs only the heat strips. It's more expensive to run it that way but you will be warmer. I hope that works for you. Let me know.
Might be dirty A-coil or filters. Might just be undersized....Ouch!
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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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