During the early and late months of winter, it might just be a better idea to open up your blinds than to reach for the heater. This is usually when the sun is shining bright enough to heat up your home so long as you don't open up your windows. Doing so will keep you from using the heater for a bit and, in turn, save you some money at the end of the month.
Of course, this solution only works so long as it's reasonably sunny outside, but it can still help you cut down on heating costs more days than not.