Clean intake vent screens
With a forced-air heating system (furnace with ducting), fresh air is brought into the home from an intake vent located near the ground at one side of the home.
Ensure this vent is clear from dust and debris.
Check & test CO/smoke detector bateries
Make sure you read the owner’s manual for both your CO and smoke detectors.
Experts recommend having both battery powered and wired-in models for an added level of protection.