Yes, it is the installation cost that makes it prohibitive for me. Running costs are less than pure electric though I guess? I looked into combining air source with solar panels & batteries, that seemed to be the most green solution currently, but much £££
About 15k they are saying, quite a bit more than even getting your entire system replaced. Not sure how they are gonna get this to catch on, as it’s nothing short of a farce.
Air source is costly to run on electricity too but they haven’t really said much yet not to mention it’s very expensive to install