Deep energy retrofits – what you need to know

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If the goal is to reduce emissions, then replacing natural gas furnaces and water heaters with heat pumps is the most effective intervention, given that the carbon intensity of natural gas is approximately 10x what it is for electricity from Ontario's grid (~20 g CO2e/kWh). Electrification provides far greater carbon reduction than either energy efficiency or rooftop solar for a grid as clean as Ontario's.

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