Windsor heating and cooling emergencies tend to follow its weather. Environment Canada's 1991–2020 normals for the Windsor A station show an average of 139.8 cm of snowfall a year, with January the snowiest month at 43.4 cm, so a furnace that fails in midwinter is a real risk rather than a rare event. The region has also seen ice storms that knocked out power to thousands in Windsor, and a dead furnace during an outage is a different problem from a faulty one. When you hire, ask who will actually work on your gas equipment: TSSA certifies gas technicians under Ontario's Technical Safety and Standards Act, 2000, with G.1, G.2 and G.3 classes, so ask for the technician's certification. If a generator is part of your plan, ENWIN says only a licensed electrician should connect it to your panel, and it should never run inside a home or garage. Ask for the work and the parts in writing before anyone starts.
Source: Environment and Climate Change Canada (source, opens in a new tab)