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  1. HVAC
    Greetings. I am installing an Aprilair model 400 humidifier into my old Carrier air handler, running off the Carrier heat pump. I have a Honeywell TH8320 thermostat. Here is my problem. The Aprilair destructions call out for a hook-up to W. Well, on my thermostat there is no W. Here is...
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