□ Do your vent covers and the wall or ceiling areas adjacent to them look soiled or discolored?

□ Do horizontal surfaces such as table tops get dusty shortly after cleaning?

□ Is your return air compartment or fan dirty?

□ Do members of your family suffer from allergies, sinus, or bronchial problems?

□ Do you notice any unusual odors when the furnace or air conditioner is operating?

□ Have you suffered a recent fire or water loss?