Coupon has no cash surrender value. Coupon must be presented at time of service appointment. Only one promotional offer per residential service address. Offer limited to the SaskEnergy Network Home Heating Tune-Up service offered by participating SaskEnergy Network Service Providers or for the SaskEnergy Home Check-Up offered by SaskEnergy only. Offer valid on appointments booked between February 1 and April 15, 2018.