[rjn5656]

We are not at our home during the early winter months. A/C was set when we left in fall. Do we need to change to a heat setting for Dec-Jan?

[Ohiogirl]

most of the homes I've seen have an automatic thermostat that you can set to switch to heat when it's below a certain temp and to a/c when it's above a certain temp. They are not terribly expensive, even to have installed, if you don't have one, but probably any home that is newer than 7/8 years already has one. Are you sure you don't already have it?

[rjm1cc]

I think you need both so look at an automatic thermostat and a humastat,

[eremite06]

I'd say leave as is. Nothing is going to freeze inside.

[homeball]

Believe it or not, homes built within the past couple of years DO NOT have one of those auto switching thermostats. One has to manually choose between heat and AC. I had one of those auto switching thermostats installed this year for $250 and it works just fine.