Cracks in a foundation can cause water to get in and freeze.  Fill the cracks and caulk where masonry meets siding, and any hole to the interior where pipes or wires enter the house.

Check to see if your paint is peeling or blistering.  Have this repaired to prevent further damage.

Make sure the roof is in good shape.  Check for missing and loose shingles.

Clean out the gutters and downspouts, inspect joints, and tighten brackets.

Applying weather stripping to doors and caulk to both windows and doors will help cut down on drafts.

Check basement windows for drafts, loose frames or cracked panes.

Weather-strip your garage door.  Make sure the seal between your garage door and the ground is tight to prevent drafts and keep out small animals.  Mice and critters are looking for a winter home now.  Did you know that mice can squeeze through a quarter-inch opening?

Check the crawl space vents located at the foundation.  Close any that are open.

Have your heating system checked by a licensed heating contractor.

Have your woodstove and fireplace inspected.  Have the chimney cleaned by a licensed chimney sweep.

Clean your humidifier regularly.  Bacteria can develop in a dirty water tank that would put unclean moisture into your room.  Don’t over-do it, too much moisture can cause condensation on doors and windows, rotting the wood.

Vacuum out all heating units to get rid of dust.

Clean or replace dirty furnace filters.

Protect your central air conditioning unit with a cover, and remove and store window air conditioners.

Change the direction of your ceiling fan to create an upward draft.

Test and change the batteries in your smoke and carbon dioxide detectors.

Remove hoses from spigots, drain and store indoors.

Every six months.  If you have a gas dryer, turn off the gas supply to the dryer at the appliance shutoff valve.  Move the dryer away from the wall, unplug it, and vacuum behind and under it.  Unhook the vent tube that leads to the outside and clear as much lint from the tube as you can.  Vacuum it as far as you can from both ends.  A dryer vent brush can be purchased to get even more area of the vent. Vacuum the inside of the dryer, in and around the lint trap.

Inspect your driveway for cracks.  Clean out and make repairs to prevent further damage.