For over 20 years, Hy-Mark has been providing the best possible HVAC service to our customers in Guelph, ON and the Tri-City Area. We are dedicated to exceptional craftsmanship and providing you with the best possible experience. From residential and commercial projects, to renovations and equipment maintenance, we take ownership in giving our customers the best possible service. Hy-Mark's name has become synonymous with innovation, service, and values.