Ours has a very high air tightness rating as I guess most new builds do and it just means that heat builds up and up and up. Couple that with being always in the sun - no other houses or trees blocking the house - and it's really fucking warm.
Heating is super efficient in the winter which is why it's designed that way I guess. Underfloor heating downstairs is on for about an hour a day and the radiators in the main rooms for maybe 90 mins throughout the day.
I'm game if you're serious :-D
Ours has a very high air tightness rating as I guess most new builds do and it just means that heat builds up and up and up. Couple that with being always in the sun - no other houses or trees blocking the house - and it's really fucking warm.