Winter is coming. Check your thermostat batteries.

The battery low indicator on this thermostat is a pretty obvious sign that the batteries need to be replaced.

Winter is coming. It's almost heating season and a good time to check and/or replace your thermostat batteries. If your thermostat batteries are dying or dead, your heat isn't going to come on during the next chilly morning.

Most electronic wall mounted thermostats (ones that have a LED screen) have batteries. It's not always obvious where these batteries are located. They can be in a compartment accessible from the front or they can be hidden behind. If you can't find an obvious place for a battery, try googling "thermostat name/model changing battery". 

Thermostat manufacturers recommend changing the batteries yearly. This is probably overkill if you have a heat only system as the thermostat is working for only part of the year. If you have a heat pump or A/C in addition to heat your thermostat is working throughout the year and may need yearly battery replacement due to the increased power demand.

Battery compartment accessible from the front. This is a nice feature.

If you can't find an obvious battery compartment on the front, try taking the thermostat off the mounting plate. Most can be pried up from the bottom and lifted off the top.

Be careful after removing the thermostat. Don't pull on the control wires or they can separate from the thermostat.