The maintenance schedule I'm presenting here is a general guide for you to follow. The actual timing is left for you to decide, and you may want to further divide the list of items for each season into months. Let's get to work.
Clean or replace furnace air filters every other month during the heating season. Periodically check vents outside (intake and exhaust) to make sure they are not blocked by snow or debris. Then vacuum all heating supply registers, return grills, baseboards or radiators inside the home.
After consulting your hot water tank owner's manual, ca…