A cracked heat exchanger in a gas-fired rooftop unit is a carbon monoxide risk. What Ontario's TSSA rules require, how techs check, and repair vs. replace.

TSSA boiler compliance in Ontario: which boilers are regulated, how inspection certificates work, who may service gas equipment, and where liability sits.

Late autumn at Front and Church. By the time the streets look like this, the heating season is already underway — and the service calendar is full. Every year it plays out the same way. The weather holds through most of September, nobody thinks about heat, and then the first real cold snap arrives in mid-October. Within 48 hours, every commercial HVAC contractor in the GTA is booked solid with no-heat calls — and the building that skipped its commercial HVAC fall maintenance