Modern homes are tightly insulated, but they have plenty of mechanized ventilation in the form of kitchen and bathroom fans as well as whole-house fans on timers. These forms of ventilation try to ensure a regular exchange of fresh air, which is particularly helpful the first year after construction because carpets, plastic laminates, and paints give off all kinds of fun fumes, thanks to the wonderful world of chemistry. An old house is naturally ventilated through gaps in the windows, doors, and walls. Even so, you still should have fans in the kitchen and bathrooms. If these rooms remain unventilated, moisture hangs around and throws a party for its friends mildew and mold. This means more frequent cleaning and painting as well as a reminder that you burned the pancakes at breakfast because you can still smell them during dinner. Check for fans and make sure they’re working. Small fans (those with a low CFM or cubic feet per minute), whose main activity is making noise instead of getting the moisture and odors out, are next to useless and should be noted for replacement.
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