Owner/Manager at www.temcocontrols.com where we make all sorts of sensors and controllers for the HVAC business. The products are all open source, you can see the repos here: https://github.com/temcocontrols

The project where most of the work is focused is the ESP32 based controller: https://github.com/temcocontrols/T3-programmable-controller-on-ESP32

And here is the front end for our system, this is the windows application:
https://github.com/temcocontrols/T3000_Building_Automation_System