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Efficiency with Two Furnaces

My spouse and I are thinking about putting an offer on a big house and during the showing we noticed it had two furnaces: one for the main floor and one for the upper floor. We live in Calgary, AB, Canada with cold winters such as -20 Celsius (-10F) so we’d definitely be using the heat a fair bit. Is having two furnaces usually more efficient and cheaper then having one furnace running all the time?

House Info: 2255 square feet of developed space but the basement has a massive crawl space that isn’t included in that number so probably closer to 3000 square feet.

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