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Old 12-10-2009, 04:36 AM   #1
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Heat pump thermostat emergency switch


I have a Trane Weathertron (BAYSTAT240A) thermostat for my Trane heat pump. When the outside temp is nears 35 degrees the heat pump struggles. There is an Emergency "On" switch which I guess turns on the electric auxiliary coils and disables the heat pump. If that is accurate, does the cost of operation increase substantially? In normal operation around 35 degrees, the unit seems to run most of the time--a five minute break per 20 minutes of operation. Is the efficiency of the emergency heat greater than this almost full time running in heat pump mode?

Thanks!

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Old 12-10-2009, 06:06 AM   #2
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Heat pump thermostat emergency switch


No it isn't.
At 35 the heat pump is supplying you with heat for a about 1/3 to 1/2 the cost of what the emergency electric heaters would.

If its running 20 minutes and shutting off for 5 minutes. Its at just under 3 cycles per hour. Which is fine for 35 outdoor temp.

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Old 12-10-2009, 01:54 PM   #3
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Heat pump thermostat emergency switch


Thank you very much. I bought this home with the AHAC heat pump in place without an owners guide or manual for the operation. Your help is appreciated.
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