Promotional value expires 90 days after purchase. Amount paid never expires. Limit 3 per person, may buy 3 additional as gifts. Valid only for option purchased. Appointment required. Merchant's standard cancellation policy applies (any fees not to exceed Groupon price). Must use promotional value in 1 visit. Air duct cleaning valid for one unit system; additional units systems require additional vouchers. Valid for unlimited supply ducts and one return air vent. Valid only within 50 miles of zip code 23218. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings