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I'm not interested in discussing the pros and cons of humidification, which is why I specifically left that out of my first post. What I AM interested in is what happens when you put a second set of...

If I understand you correctly that will open the solenoid valve when the humidistat contacts close. That might be OK for a wet-pad type humidifier, but I'm working with a steam type humidifier,...

I want to be able to run a humidifier even if there's not a call for heat.

So I'd have to disconnect Y if I want to leave the fan switch in AUTO?

Looking for tech info on Tstat/furnace connections. If I put an external set of contacts across R & G to drive the fan independent of a call for heat, will I somehow be forcing the compressor to...