Promotional value expires 180 days after purchase. Amount paid never expires. Valid only within 30 miles of zip code 78701. Appointment required. Additional services available at an additional cost. Additional vents are $15 to $25 per, return vents are $25 to $55 per, main lines are $55 to $85 per and roof dryer vents can be a additional $100 to $250. Not valid if mold is present. Due to liability reasons, full clean will be needed in these situations. Limit 1 per visit. May purchase 3 additional as gifts. Maybe repurchased every 180 days. Valid only for option purchased. May be repurchased every 180 days. Must use promotional value in 1 visit. Valid only for option purchased. All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings