Heat pump and thermostat questions
I have two question and I was hoping you guys might be able to help me out.
The first question is in referance to our thermostat. It was here when we bought the house in 2007 (probably installed as a replacement by the previous owners). It is a Hunter Model #44670. It has an Span Stage setting with a 1,2 or 3 option. The manual does not really describe what the Span Stage setting is for. Does anyone have this thermostat and/or know what the Span Stage is for and what is the best setting to leave it at.
The second question is about the heat pump itself. The heat pump is a RHEEM,10 SEER, and is, IMO, not function properly. Even when it is 40 F outside it is having trouble raising the temp of the house 1 degree without resorting to the AUX heat after about 10-15 min of running. I know heat pumps are not as effective as the temperature drops outside, but should the Aux really need to kick in when the outside temp is > 35 or 40. The Aux heat is 10 KW and is killing us on the power bills. We keep the house 65-67 F so it is not like we are trying to keep the house like at an unreasonable temp. (We have had the system serviced in the last month and everything checked out, Freon levels were fine, etc.)
Thanks in advance for your help