Hy-Mark is an award winning, full service mechanical (Heating - Air Conditioning - Plumbing) company delivering best-in-class ... workmanship and offering ongoing support to our valued customers. From residential new construction, to renovations and service – we take projects from conception to completion and maintain equipment for years to come. Hy-Mark’s name has become synonymous with Innovation, Service, and Values. With locations in Guelph, Owen Sound and London we service the communities we live and work in. We are pleased to be associated with many of the highest quality home builders and renovators in Ontario. read more