re: Humidity Level New Construction

Crawdude, you have a link to that hygrometer?

2 different a/c companies. The current one I’m using just checked all of my duct work, did a basic tune up, and basically told me to call back if the issue continues. Trying to get some ideas to pass on.

I’m curious about the cfm/ton setting. I’ll have to research that unless someone wants to elaborate.

I bought them via Amazon - just type in

AcuRite Digital Hygrometer with Indoor Monitor and Comfort Scale (01083M) Room Thermometer Gauge with Temperature Humidity, 3 x 2.5 Inches
Visit the AcuRite Store
4.6 out of 5 stars 7,364 ratings
-16% $13.52$13.52

It’s dropped in price since when I bought 2 in 2019.

I also have several of these placed throughout the house, in attic, outside carport freezer, and outside on a coverd patio. More expensive but really convenient LINK

What is your furnace model? That appears to just be the motor model you posted.

After some further inspection and research. This is how the blower is hooked up.

Heat - Blue (Medium speed?)
Cool - Black (High speed?)
M1 - Red (Low Speed?) M1 is the spare spot I believe.

If this is all correct, do I need to slow it down? I'm willing to try just about anything at this point. I've been fighting this humidity issue for years now.

Thank yall a ton for offering help!!

I switched the black and red wire. I’ll see how this works. It came back on!

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I believe this is the exact reason DR Horton is getting sued. Their homes don’t meet the humidity level proofing we need in south LA. Hence, mood growth

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I owned two houses in South La, both built in the 1930s. They still had original single pane windows, no insulation in the walls, or under floor, minimum insulation in the attic. Cooling them was not a problem, and never had a issue with humidity or mold. Because of my experience I would be curious to know what should have been done in the construction of those homes that wasn’t.

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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!

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I owned two houses in South La, both built in the 1930s.

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I’m guessing neither of these homes had Sheetrock.

I appreciate all the help guys. So I have a Sensei thermostat, I connected it to wifi and have adjusted the humidity to match my other meter.