After discovering OpenHAB and playing around with it for a bit, I have it now “in production” with my ComfoAir 350. I wanted to add more intelligence to my ventilation system since out of the ComfoAir 350 it is not very intelligent. It offers a time-based profile which is very difficult to enter using the CCEase head unit. I wanted something that takes into account time, temperature, and humidity. My flat is set up such that air is pushed into all rooms except for the bathrooms, where it is sucked out. Since the bathrooms don’t have a window or any other means but the ventilation to get moist air out, it would be nice to accelerate ventilation automatically if someone is having a shower. Therefore, I added a humidity sensor. I used a RaspberryPi A (the rather old Model B) and added a MAX2323 level shifter for the serial port, and a Honeywell HIH6131 humidity and temperature sensor. The HIH6131 “breakout board” is now installed next to the bypass inside the ComfoAir. I placed my OpenHAB configuration on GitHub. This really got me excited! I’m thinking of integrating my blinds and add some presence detection through my router. I hope this post inspires someone else to explore the possibilities of smart home automation with OpenHAB. Thanks to everyone who contributed to this amazing platform!