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  1. General HVAC Discussion
    Good day to all! I'm a freelance electronics engineer, and I've just been engaged by a client who is developing a product to be used in residential HVAC systems. I'm not allowed to say what the product is, but I can say that it would be connected electrically to the furnace control board. I'm...
  2. General HVAC Discussion
    I have a lennox HP26 with a retrofit defrost control and no code ledger need to know what red and green status lights are
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