Inside

• Have wood burning fireplace cleaned/ inspected
• Vacuum fire and smoke detectors, as dust or spiderwebs can prevent them from functioning
• Clean Humidifier. Clean your humidifier two or three times during the winter season
• Check and reset the GFCI’s 
• Test smoke alarms and carbon monoxide detectors 
• Check roof vents and ensure proper attic ventilation
• Clean refrigerator and freezer coils and clean drip trays, change water filters. Vacuum radiator grills on the back of refrigerators and freezers, and empty and clean drip trays
• Clean drains in Sinks Tubs Showers and Dishwasher 
• Change fan direction - air pushes up, run fan clockwise
• Seal drafts and windows
• Clean or replace filters in: Furnace, Heat recovery ventilator (HRV, )Vacuum bathroom exhaust fans. (Vacuum bathroom fan grills to ensure proper ventilation)
• Check and clean or replace furnace air filters each month during the heating season. Ventilation systems, such as heat recovery ventilator filters, should be checked every two months as well.
• After consulting your hot water tank owner’s manual, drain off a dishpan full of water from the clean-out valve at the bottom of your hot water tank to control sediment and maintain efficiency
• Check gauges on all fire extinguishers, and recharge or replace as necessary
• Check the basement floor drain to ensure the trap contains water. Refill with water if necessary
• Monitor your home for excessive moisture levels – for instance, since condensation on your windows can cause significant damage over time and pose serious health problems, this requires corrective action
• Check all faucets for signs of dripping and change washers as needed. Faucets requiring frequent replacement of washers may be in need of repair or replacement
• If you have a plumbing fixture that’s not used frequently, such as a laundry tub or spare bathroom sink, tub or shower stall, briefly run some water to keep water in the trap
• Clean drains in the dishwasher, sinks, bathtubs and shower stalls
• Test plumbing shut-off valves to ensure they’re working and to prevent them from seizing
• Examine windows and doors for ice accumulation or cold air leaks. If found, make a note for repair or replacement in the spring

Outside

• Shovel heavy snowloads off of your roof as needed
• Remove Ice and snow from window wells 
• Check Exhaust fans 
• Remove snow/ice from roof overhang
• Cover air conditioning unit - Avoid wrapping the unit entirely, your unit is protected best by only covering the top 
• Drain/ Close all exterior faucets
• Bring power washer inside
• Clean flower beds and wrap shrubs and trees
• Examine attic for frost accumulation. Check roof for ice dams or icicles. If there’s excessive frost or staining of the underside of the roof, or ice dams on the roof surface, be sure to have an expert look into the issue

Every homeowner should own a hygrometer that measures temperature and relative humidity (RH). The ideal relative humidity for health and comfort is about 40–50%. In the winter months, it may have to be lower than 40% RH to avoid condensation on the windows.

Health Canada recommends keeping the humidity above 30% in winter and making sure it doesn't exceed 55% in summer