Inspect the attic and basement or crawlspace. Insulate voids in the attic – the entire attic floor above a living space should be insulated with at least six inches of insulation, except around electrical fixtures such as recessed lights that aren’t rated for contact with insulation. Damp basements and crawl spaces can become mold and mildew problems. Watch for leaks from your water heater, plumbing system and seeping rain water from the roof. Locate and maintain a clear access to your main water shut off valve. If you have a sump pump, test, clean and lubricate it.