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Old 04-11-2013, 10:38 PM   #1
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Disconnect Stage 2 Cool (Y2) on thermostat


Last fall I read up about Aux heat on my heat pump and learned that I could disconnect the W2 wire on my thermostat to disable it. I saved literally thousands of dollars this winter doing so. I have a 2 stage cooling system, so if I disconnect the Y2 wire that activates the 2nd stage cooling, will this only run on stage 1 and use less electricity? And if so, will this harm my system in any way? I know it may not cool the house as fast, but if it saves a lot of $$, I don't mind. Any insight is appreciated. Thanks!

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Old 04-11-2013, 10:41 PM   #2
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Disconnect Stage 2 Cool (Y2) on thermostat


low speed cooling is a dehumidification process first and foremost. might want to leave y2 connected as also your system will be running longer to achieve a set temperature on low speed only.

try it and see how it works.

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Old 04-12-2013, 05:21 AM   #3
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Disconnect Stage 2 Cool (Y2) on thermostat


When you disconnected W2. You disabled the electric resistance heat. Which uses a lot of electric.

For cooling, disconnecting Y2 won't save much if any money. Won't harm the A/c. but may mean your house could get a fair amount warmer then you want. Set the thermostat temp 2 or 4 degrees warmer then you normally would, and it will save you money on cooling.
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Old 05-21-2013, 06:26 AM   #4
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Disconnect Stage 2 Cool (Y2) on thermostat


Thanks guys, I will leave the AC alone and keep AUX disabled in the winter months. With a 160 yr old house, I'm always looking for ways to stay as efficient as possible. Thanks again.
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Old 05-21-2013, 06:41 AM   #5
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Disconnect Stage 2 Cool (Y2) on thermostat


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Originally Posted by birdflu View Post
Thanks guys, I will leave the AC alone and keep AUX disabled in the winter months. With a 160 yr old house, I'm always looking for ways to stay as efficient as possible. Thanks again.
Some setups have separate disconnects for the heating elements, thus, eliminating the need to actually disable the AUX terminal.... just a thought. Would be easier to re enable the AUX heat if so needed on colder nights.
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