12 June

The clear winner is split systems. I had all our gas heating and its ducting removed. The ducting was obstructing the subfloor ventilation anyway. It was a ridiculously cumbersome system. The problem with ducted systems, even when attached to heat pumps (air con) is that you lose so much energy in the ducts themselves. And they need regular cleaning (which most never organise). I had a split system installed in every room instead. Was much cheaper as a bonus. Add solar and a battery, and that y-axis isn’t even needed. It’s costing us nothing to heat now. Add that heat pumps work more efficiently when you run them 24 hours a day, and why would you use anything else?