Converting a house into an environmentally friendly structure does not necessarily require installing an elaborate solar array on the roof or adding space-age construction materials — though expensive projects have a bigger impact on the environment and can bring significant savings on energy costs over time.
These thermostats can be programmed so that they only turn on at certain times of the day — for example, beginning to heat up just before you get home, and shutting off an hour or so before you leave the house.