Outside
Fall means that it is time to do a perimeter check of your home. Start with the roof, looking for areas where moisture can enter your home. Replace any loose or curling shingles. Clean out gutters and downspouts. Check the chimney as well, before your furnace starts up. Remove all fallen debris from the yard to limit mould growth. Caulk around windows or other areas where moisture may enter the home. Clear the clutter, paint, varnishes, and volatile chemicals from the garage. Do not store these in the house.

Inside
Have your furnace professionally cleaned and serviced ready for the heating season. Be certain that all filters have been replaced. Check the fireplace and keep the flue closed until you are ready to light a fire. Kerosene heaters, un-vented gas stoves and gas heaters are a source of nitrogen dioxide, where as wood burning fireplaces and stoves as well as kerosene heaters and tobacco smoke produce particles and should be avoided at all times. Gas stove exhaust fans must be vented to the outdoors. Clothing and paper items should not be stored in the basement as they attract moisture. Keep the moisture level in the house between 40 and 50% to limit dust mite and mould populations.