Promotional value expires 120 days after purchase. Amount paid never expires. Appointment required, 24 hour advance notice required. Appointment required. Limit 1 per person, may buy 2 additional as gifts. May be repurchased every 30 days. Limit 1 per visit. Limit 1 per household. Valid only for option purchased. Valid only within 60 miles of zip code 28269 and zip code 28146. Offer valid for Charlotte, Salisbury, and Greensboro. Offer is valid for unlimited duct cleaning, with 1 main trunk line, 1 return, and 1 dryer vent Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings