As with every other energy sources, an annual maintenance of natural gas appliances by certified professionals is essential. Make sure that the work is contracted to a company that has a licence from the Régie du bâtiment and that is a member of the Corporation des maîtres mécaniciens en tuyauterie du Québec (CMMTQ). Any technician or heating contractor working on a natural gas appliance must hold a natural gas competency certificate from Emploi-Québec.
To save even more, perhaps it's time to replace them by new high energy-efficient ones. Take advantage of grants available to upgrade your equipment.