Promotional value expires 90 days after purchase. Amount paid never expires. Valid only within 50 miles of zip code 63121. Extra fee of $20 outside service area. 24-hour cancellation notice required. Appointment required. Additional vents are $10 each, additional main lines starting at $39. Crawlspaces and attic systems may incur additional costs. Entire system must be cleaned to redeem offer. $25 travel fee will be collected if no work is performed. Limit 4 per person. May be repurchased every 365 days. Limit 1 per visit. Limit 1 per household. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings