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A heat pump thermostat prefers to operate the heat pump under "usual" conditions as that is expected to be less expensive. It will invoke the back up (or "emergency heat") when any of several conditions occur: The current indoor temperature is more than 4 °F/2 °C cooler than the temperature setpoint. This is the blockhead approach taken by ...


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What you’re describing sounds like a combination of negative pressure in the compartment that the drain pan connected to and an incorrectly sized p-trap on the condensate drain. The depth of the t-prap has to be greater than the negative pressure in inches of water column of the compartment where the drain is connected to. A t-prap with insufficient depth, ...



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