re: Humidity Level New Construction

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That’s correct M1 is just a “dead” parking spot for a wire not being used to run the heat or cool. You might want to put the blue wire (medium speed) on the cool spade connector instead of the red (slow speed) to see if you get reduced humidity, as you have the potential to freeze the evaporator coil if by running the blower at to low of a fan speed. You are correct in that as a general rule the black wire is the highest blower speed.

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I will keep an eye on it. In just one night, it is very clear that the system is doing a better job of controlling humidity. Now that I figured it all out, it’s an easy swap.

It amazes me that I’ve had multiple a/c “professionals” look at this issue and not a single one mentioned that the blower speed could be off.

I’ve been dealing with this issue for YEARS now. I’m not going to say I’m out the woods just yet, but I really do appreciate everyone that helped with this. I am not kidding when I say this problem has haunted me….I owe some beers!