HVAC in Ajax, ON

A deeper look at how Ajax conditions shape the hvac work owners actually need.

Ajax HVAC service calls are concentrated in three failure categories that correspond directly to the city's building age and climate. The first is mid efficiency furnace heat exchanger failure. Furnaces installed in South Ajax and Central Ajax homes before 1995 carry heat exchangers that have cycled through 30 or more Ajax winters. Hairline cracks form in the heat exchanger wall from repeated thermal expansion and contraction, and those cracks allow combustion products including carbon monoxide to migrate into the air stream. TSSA certified technicians conducting annual combustion analysis in Ajax homes catch heat exchanger cracks while the unit is still operating, before a carbon monoxide detector alert or a tenant complaint triggers an emergency call. When a heat exchanger crack is confirmed, the decision is repair versus replacement. Replacement heat exchangers for furnaces from the 1980s and early 1990s are often discontinued. The practical path is full furnace replacement with a modern high efficiency condensing unit rated at 95 to 98 percent AFUE. That replacement reduces annual heating gas costs by 25 to 40 percent compared to the old 70 percent unit, which partially offsets the replacement cost over five to eight heating seasons. Bridgepoint sizes replacement furnaces for Ajax homes using heat loss calculations that account for the home's insulation level, window area, and basement type, rather than replacing the unit with the same nominal size, which may have been oversized from original installation.

The second failure category is condensate drain freeze in newer Ajax homes. High efficiency condensing furnaces produce acidic condensate that must drain through a PVC line to a floor drain or sump. In newer Westney Heights and Northwest Ajax homes, those condensate lines are sometimes routed through uninsulated rim joist cavities where they freeze during January cold snaps. A frozen condensate line triggers the furnace pressure switch lockout. The furnace stops functioning and the tenant has no heat. Bridgepoint's repair involves clearing the frozen condensate line, rerouting the line away from the uninsulated rim joist, and in some cases adding a freeze protection heat cable to the condensate discharge point. That rerouting prevents the same failure from recurring the following winter. The third category is heat pump installation in Ajax homes that are converting from gas to electric heating as part of owner sustainability or cost decisions. Ajax's climate, with January lows in the minus 10 to minus 14 Celsius range, requires cold climate rated heat pumps with a minimum heating coefficient of performance above 1.5 at minus 15 Celsius. Bridgepoint sizes and installs cold climate heat pump systems with appropriate backup resistance or gas hybrid configurations that maintain occupant comfort through Ajax's coldest periods without triggering the backup resistance heating penalty at moderate temperatures.