I do home inspections in the charlotte nc area and have been noticing this for a few years on all of the new heat pumps.
I don't see it as a defect but am wondering why these nice R410 units would have a programmed design that wastes energy.
Is it done to reduce what may be perceived as nuisance callbacks from home owners that don't like heat pumps due to long past issues?
If the set point is raised just one degree, the aux heat usually comes on and is displayed as such.
I say "usually" because the actual amount of difference between the room temperature and the set point is displayed without the benefit of knowing the tenths of a degree that is used internally to the t-stat. With 2 degrees set it always comes on. As we all know, the aux heat uses about 3 times the power per btu than the heat pump.
I see mostly Carrier or Lennox heat pumps that use Honeywell t-stats.
Typical t-stats: Honewell TH6320R1004 and RTH3100C1002/A
Anyone know why they have designed these to not take advantage of heat pump technology any better than this?
Since the manufacturer will not take calls from anyone other than you guy's could someone look into this for me please?