Stemming from a small issue of leaving doors open I got a simple idea which could save both money and the environment. Yes, a bold claim so let me explain.
We have a cottage we rent out on Airbnb. That is all great, and we meet some lovely people that come to visit. However, for some strange reason, people will turn on the air conditioning in summer to cool the place down, but then leave the door open so all the cold air goes straight out. In winter the heater mode will be on the reverse cycle air con, and again the door open. Why? Really good question, but we have seen it at least 20-30 times. Not only does that get expensive (heating/cooling the outdoors), but what a waste of energy as well.
To fix this issue I deployed a simple solution using an Aqara door sensor, and a Sensibo air condition smart controller. Now the air con turns off if the door is open for more than 15 minutes. Job done.
Check out the full video for all the details.