Erin is right.
Originally Posted by Erin
Your house will lose a certain amount of energy due to its specific insulation characteristics, and the higher the internal temperature relative to the external, the more energy will be lost. Ergo, the hotter and longer that your heating is on, the more energy you waste
This is from a purely techinical point of view and not a practicality or comfort aspect.
In winter, I try to keep the core of the willk residence at around 15C (the optimal temperature for cider fermentation, luckily
) by utilizing underfloor heating.
Extra heat is then dialled in for certain areas (kitchen/living/bedrooms) at certain times, by means of CH zones and open fires/stoves. The secret seems to be in keeping a fairly low temperature gradient for inside/outside/most of the time.
Having the CH burner in the kitchen with the flue rising via internal walls boosts heat recovery by quite a surprising amount...
...the bats certainly seem to like it.