Interior:
Change the batteries in all of your smoke detectors & carbon monoxide detectors.
Clean and/or change the filters in your furnace.
Clean out any lint and/or fabric from the vents of your clothes dryer.
Check electrical outlets for potential fire hazards such as frayed wires or loose fitting plugs.
Check for overloading of electrical outlets, fuse boxes, extension cords etc.
Keep a filled and ready-to-use, multi-purpose fire extinguisher accessible.
Check water heater for leaks and corrosion.
Check sump system (if applicable).
Vacuum refrigerator condensing coils.
Inspect shower, tub & sink caulking for deterioration.
Inspect all plumbing fixtures and supply lines for leaks.
Run a hot-water cycle of your dishwasher with a cup white vinegar placed on the upper rack.
Upgrade washing machine hoses to stainless steel jacketed hoses to help prevent failure.
Lubricate and service the garage door hardware and openers.
Inspect the fire sprinkler system periodically (if applicable).
Termite inspections should be performed every 3 years.
Exterior:
Survey all vent openings for compromised screening or other deterioration.
Ensure all sprinklers are aimed away from structure.
Remove dead leaves and all debris from your gutters and downspouts.
Ensure all gutters & spouts take water well-away from structure.
Remove all dead trees & keep healthy trees & shrubs trimmed & away from utility wires.
Repair driveway & walkways that are cracked, broken or uneven to provide a level surface.