Anyone had any luck with A2A installers in the central belt? I've so far only managed to get one quote at 13k (ex VAT) for 2 x outdoor units and 4 x indoor units (2 x 1.8, 2 x 3.5) excluding electrical supply setup / isolator work.  Looking at the unit costs on Orion, that seems like a very high cost for partial installation.  One of my solar installers is FGAS registered but has only ever fitted water wet HP pump solutions. I'm assuming that like ASHP, you really want someone familiar with