You Have No Power
Every winter, thousands of people lose their electricity when the power goes out. Wind, ice and snow are the usual causes.
A major concern during a prolonged power outage in winter is the loss of heat. No matter what kind of heating system you have or which fuel you use, your home will go cold when the lights go out. The reason? Your thermostat relies on electric relays and switches to call for heat.
Other parts of your heating system that need electricity are the fuel pump and, if you have a furnace, fans and blowers.
In most cases, your thermostat will resume functioning when power is restored, although older, programmable thermostats may need to be reset. Consult your owner's manual.