Quite simply, a “healthy home” supports and protects the health and safety of its occupants. Scientists now understand how our houses can harm us. A home should have no indoor pollutants, no dangerous chemicals, no radon hazards, and no physical safety or fire risks. Unfortunately, many American homes have moisture and ventilation problems; asthma and allergy triggers; chemical and toxic exposures; and fire, electrical, and tripping hazards. Sometimes, poor construction is at fault. More often, inadequate or deferred maintenance leads to hazards. Also, some homes pose challenges to occupants’ mobility, safety and independence as they age.