I have had a Heat Pump for a few years now, but I am not happy because it runs a long time ramping up to the day time temp. Am using more power by using a set back thermostat? Should I set it to a closer temp between day and night? I set it at 67 in the day and 62 at night. If it is about 34 outside it takes about 3 or more hours to come up to temp. I have the unit serviced every fall and it is always in great shape.