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Cold-weather capacity, balance point and backup controls must be designed together to protect comfort and cost.
Key decisionDecision: ask when, why and how backup heat will start.
The role of backup heat
As outdoor temperature falls, the home’s load rises and some heat pumps deliver less capacity. Backup heat fills the gap when required.
The balance point
The balance point depends on the building, heat pump, climate and energy costs. It should not be selected by habit or a universal value.
Put the question in the quote
Ask for capacity at key temperatures, the backup source, control logic and what happens during a fault or extreme cold period.
Official sources
Updated :
Programs and criteria can change. Always verify the official source before making a decision.