If you have a natural gas or oil furnace ...and a whole house central A/C unit that is already four or five years old... check out replacing it with a air-to-air heat pump. Furnace stays off during much of the heating season.
Here in Pittsburgh the payout for the incremental cost of a heat pump over a central A/C unit was less than a year based on $10 natural gas and 6-cent power!
I'm in an apartment, so I'm stuck with what I got. Everything is electric, it's just that our electricity is mostly LNG here.