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Here is an interesting chart that depicts indoor and outdoor conditions and the effects of cold temperatures on a 2 stage heat pump that has been set to heat a house to 60F. Auxiliary space heat was used to also heat one room to 71F. This test was part of an ongoing series of experiments to help determine how one could save money during the colder months of fall and winter.Note what happens when the temperature dropped below 35F outside and the heat pump was forced to change over to resistive heating as a result.
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