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Hi Andehh, I haver a similar setup to you. Do you have the Heatmiser Neostst V2? I found them very unstable and each one was calibrated differently. My MVHR was also having a cooling effect on the stats because there is no vent in the stats to allow good airflow. Long story short, I'm going to replace all the heatmiser stats with Joule E91 stats as they are a lot more stable. The only thing is ill loose the App and wifi availability. Also would you not consider to set your stats to the one temperature and forget about them, its a lot more energy efficient than having them on heating periods. You should cut your run hours in half

Hi Ultima, Just to note that I have experienced the exact same problems as you including the heating/cooling effect when the MVHR is turned on. I took a Testo DP440 meter calibrated to 0.5C with hotwire probe taped to a camera tripod and placed it directly below the temperature sensor on each stat.(with MVHR switched off) When the temperature settled I calibrated each Neo stat. The house temperature feels more balanced now. I also noticed that the stats run at 24C internally (measured with a thermal imager). I tried to plug any conduit drops or draughty openings behind the stat with expanding foam to keep that temperature of the stat stable before calibrating. I had a stat in an attic room getting a bit of a draught cooling the electronics. Over all I'm still not happy with these stats. I have 11 in the house in total. I think I am going to replace them all with the Joule E91 stat which seem a lot more stable (currently testing one in the kitchen) The only thing is I will loose all Wi-Fi and app availability. By the way, in the bedroom the "calibrated" stat was reading 20.5C and the room felt really warm. I thought something wasn't right and to confirm my suspicion, the baby monitor alarmed at 24 degrees. These stats really have me driven mad.🙃