We’ve had a three-head Mitsubishi Mr. Slim system for about a year now, and we’ve noticed that it takes a fair bit of fiddling to get the unit to hold a set-point. The necessary offset in heating mode is something like 8 degrees F, varying with the outside temperature. During the shoulder seasons, it seems like we pretty much have to cycle the unit off and on or it will overshoot. I understand that the indoor units’ temperature sensors measure essentially the air near the ceiling, so some fiddling is to be expected, but it would still be nice if they could be controlled by a separate thermostat that could provide real feedback. Unfortunately, it looks like the only real option is the MHK1 https://amzn.com/B008MB3UM4, which is absurdly overpriced compared to conventional thermostats. Any savings from more efficient operation wouldn’t come close to covering the cost of installing three of these things! Is there any other option for setting up a proper thermostat for Mistu minis?