Promotional value expires 120 days after purchase. Amount paid never expires. Valid only within 30 miles of zip code 48386. Appointment required. Limit 3 per person. Call (248) 497-6464 before purchasing if you have a crawl space, apartment, or mobile home. Extra $33 for each additional vent. Merchant's standard cancellation policy applies (any fees not to exceed Groupon price). May be repurchased every 30 days. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings