jon3

Thanks for your replies. It must be just us - but I'm only talking about 10-12 for the time when we're in bed and under the duvet - heating would kick in 30mins before wake up and then yes set for 19. with bathroom with UFH slightly higher. I tend generate a lot of heat in bed (no not that!). We have always had heating off just before bedtime and upstairs windows open throughout the year - apart from when its below freezing. our winter duvet is only 4tog our (summer) duvet is 1tog and has been since the middle of may. Hence why i'm a bit worried about the MVHR design. Admittedly 10-12 was a guess. I will make sure we get some actual temperature tracking on our current bedroom asap.

We are just in design phase for self build with MVHR. The only real passive house we visited was an upside down house on a hill side. Sleeping quarters downstairs were quite a bit cooler that the living spaces (upstairs). As the laws of physics are hard to beat I am worried that we could end up with sleeping quarters (always upstairs for us) that are considerably warmer than we want... Our design spec will be 19degC living and 10-12 degC sleeping. I would really like to read a lot more real experience of what its like living with these systems day to day (season to season) with the hope that we can design it right and incorporate some sensible flexibility as it seems that different people feel heat & cold quite differently .. (ps. 1st post - I'm new to the forum so please be gentle :-)