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Accurate room-by-room heat-loss calculations help determine the right size heat pump, but a study of information from roughly 75 US homeowners found tradespeople’s estimates often overstated heating needs by a factor of two or more. Oversized systems can use excess energy and cause uncomfortable temperature swings, while surveys have cost some homeowners more than $1,000. Apps such as Cool Calc and Heatpunk let homeowners estimate heat loss, but experts say professional surveys and sound installer practices remain essential.
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