Once you’ve picked out the perfect thermostat for your home, check its price at online retailers and your local hardware stores. And don’t forget to check your local electric utility, which might have rebates or discounts on new thermostats.

If you aren’t replacing a broken thermostat, the best time of year to buy one is October through December, when holiday and end-of-year sales will include thermostat discounts (even if they aren’t the greatest gift).