It has never been clear to me if the HVAC subcontractors who installed the system in our home understood the basic concept of a feedback loop. We have a four zone heating system (first floor, basement, master bedroom, rest of the second floor). The thermostat for the second floor was located in the upstairs hallway where it was influenced by air coming up the open foyer from the first floor rather than the second floor air in the bedrooms (whose doors remain closed for most of the day). Today I moved the second floor thermostat into Maya’s bedroom where it will ensure a closed feedback loop for at least one of the rooms. I believe the other bedrooms will be more comfortable as well.