Promotional value expires 120 days after purchase. Amount paid never expires. Appointment required. Valid only within select states and counties. Air Duct Cleaning Option only valid for one heating/AC system/zone (most single-family homes only have one zone). For more information on how many zones you have please contact Crystal Clean. Does not include dryer vent exhaust, bathroom exhaust fans, sanitizer, blower fan/housing, indoor coils and burners, chimney/fireplace, mold remediation, anti-microbial, flood damage, and fire restoration. Not valid with other offers or promotions. May be repurchased every 365 days. 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