Promotional value expires 120 days after purchase. Amount paid never expires. May be repurchased every 30 days. Valid only within 20 miles of zip code 22193. Appointment required. Limit 2 per person, may buy 2 additional as gifts. Limit 1 per visit. Valid only for option purchased. Additional units will be an additional charge. Not valid for oil or propane furnaces. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.