Expert HVAC Company Proudly Serving Saskatoon Homes Since 1985 Call or Click Now for Top-Rated Residential HVAC & Fireplace Service! Efficiency Heating, Cooling & Fireplaces is a full-service Heating and Cooling residential and commercial contractor. Efficiency Heating, Cooling & Fireplaces was started in 1985 and is owned by Tim Hofer and Derek Hautz. Both Tim and Derek are long-term residents of Saskatoon and take pride in servicing the community.