Smart Calgary homeowners treat furnace tune ups like oil changes—essential prevention that saves thousands long-term. Purcell Heating and Air Ltd's service page outlines their systematic approach: vacuuming internal components, testing safety limit switches, lubricating inducer assemblies, and verifying proper voltage across controls. For "furnace tune ups" planning, their $150 annual... https://www.purcellheating.ca/furnace-tune-up/