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Thank you, BigJon3475. It's not too late - I got some other info, but this one is more detailed and easier too understand.

What I plan to do is (try to) find an A/C guy that is more up to speed...

Davo, what is a sensor and how would it affect the thermostat / cycling on/off of the unit?

Regarding the return where the door closes when the A/C turns on: It just happens to be right next to...

Wow! Thank you so very much, all of you, in trying to solve my problem. I really, really appreciate you taking the time out to help me.

I checked last night, and all three of the bedrooms in...

Thanks, dash and Mr. Bill. This is good information. Perhaps I can do a little more research on this and then (hopefully) find a good A/C guy that understands this stuff and can apply it to our...

Thanks, Mr. Bill. Unfortunately, I'm just a layman and have no clue what a VS air handler is. I'm in Jacksonville, Florida, about as humid as you can get. Pressurization isn't the main problem, of...

No go, Big Jon3475. I tried just looking for the Builder's Guide, but the links were to a place to purchase the Guide, not for info in the Guide.

I guess I just need to find a good A/C...

Wow, BigJon3475 - your post hit the problem right on the head. The bedroom I have the most experience with has a major problem with pressurization. When the A/C turns on, the door will close by...

Thanks, rojacman, been there and dash.
There is a return air in two of the bedrooms, but I'm sure that's not the same as a jumper duct. That sounds intriguing. We have joist or attic space...

Thanks, DanW13. I appreciate your reply, but to me, that's about the same as putting a vent in the door insofar as hearing what goes on in/out of the bedrooms is concerned. I'm really curious about...

Got a nagging problem with our 5-ton Trane setup. It's a 3-zone system on an older split-level (three levels) cedar shake house. The thermostats are all in a hall area, which seemed like a good...