Replace thermostat batteries
Short answer
Each fall, pull the thermostat off its wall plate, swap the batteries, and snap it back on.
Why It Matters
A dead thermostat can't run heating or cooling, leaving the home unconditioned at the worst time.
Materials
- AA or AAA batteries (check your thermostat model)
How to Do It
- Check your thermostat model or existing batteries to confirm whether it takes AA or AAA batteries, then have replacements on hand before you start.
- Grip the thermostat body and pull it straight off the wall plate; most units unclip without tools.
- Remove the old batteries and insert the new ones, matching the polarity markings inside the compartment.
- Snap the thermostat back onto the wall plate and confirm the display powers on.
- Between annual replacements, watch for a low-battery icon on the display and swap batteries promptly if it appears.
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