Promotional value expires 120 days after purchase. Amount paid never expires. Valid only within 25 km. of zip code S4N 0E7. Appointment required. Merchant's standard cancellation policy applies (any fees not to exceed Groupon price). Limit 1 per person, may buy 1 additional as gift. Must use promotional value in 1 visit. Limit 1 per home or 2 for homes with 2 furnaces. Extra $7 fee for each additional vent. All vents must be cleaned in the home. Only valid for electric and natural gas forced air furnaces. Only valid for two-story residential households. 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