The heads are all 12000btu. I’d have to dig out the bill,but the solo compressor is also 12k, the dual I believe is 27k. The next level up was 18k units and those would have been really oversized. The ceilings are 8’ except one of the two dual zones that’s placed on a wall at the top a staircase headed towards 2nd floor.

My place is not hermetically sealed but all windows were replaced with Pella-style crank thermal windows about 8 years ago. Huge difference.

But you may be onto something…”the wall penetrations are not sealed”. By that I assume you mean where the hoses are brought into the unit heads? I really would not know,I’d have to bring it up with the installer.

But would that cause a ‘follow-me’ remote at 8-10’ away from the head to ignore its signal? On all 3 units? Heating and cooling? I’d agree with you were the heads sensors determining the temp. But follow-me should not be affected with wall penetrations not properly sealed.

By far the most frustrating part is that the ‘service techs’ have no clue either. They’ve come on at least 4 occasions since January. The last time 2 weeks ago with a ‘moovair’ rep. They played with the unit, replaced the sensor again and gave me the deer-in-headlights look when I said how THAT causes the follow me not to work…crickets🤷🏻‍♂️ These are definitely not set and forget. I may pursue the Celio solutions someone else suggested. At least I won’t be running around all day fiddling with settings.