We have a programmable thermostat that is designed for heat pumps. We just got lazy when the battery went out and left it in manual instead of reprogramming it. I will have to look at it. I don't think that it has the ability to force heat pump only mode without aux heat. My wife has also been at home so she would turn into an ice cube (or more of an ice cube). She's already not allowed to touch me in winter with bare hands
. At least not without warning me first.