@Declan52 I stopped short of that previously as its a bit of a mess to look at, but hopefully it is clear enough. This was my recent attempt as runs, until I showed my builder.
Note that the partially transparent red features are large structural steels, the solid joists run from left to right between the first and ground floor, purple spaces are vaulted. We have lots of full height cabinetry planned in the kitchen living area, and conceded to have boxed sections under the ground floor ceiling on the east wall to conceal ducts that need to run up and down the house, under the ground floor ceiling. There are compromises everywhere and yet its still very challenging.
Builder has no idea how we would get 10 feeds down through the void in the master bedroom, while the void would be big enough, the wall separating the master and the ensuite is supporting, so its a not viable void candidate unless some major revisions are done.
Please note that the loft space is very small, at the apex it is around 1.5m tall after insulation, so the flat roof section will be approx 0.7m max, it is truly a crawl space. Even placing the unit will be a challenge. Makes for sub-optimal distribution box placement too, lengthening all the runs. Had hoped they could be situated above the ensuite but builder thinks unrealistic, especially if i would ever need access.
Windows are already ordered without trickle vents. I would like to avoid a decentralised unit for reasons or cost and in room / outside of house aesthetics, and likely noise. I could concede to the garage having its own through wall unit as the unit would be hidden around the side of the house exterior.
The thermal losses will probably be the same, so the loss of CoP is probably similar.
Any pipework needs to be very well insulated if it is to be buried in the ground.
Keeping pipe runs as short and straight as possible.
I would love to know! But it may be more than a few metres, in my ideal world it would be more like 20m. I know some of the LG split units say that they can be sited up to 50m from the property, but they don’t seem to tell you if there are any implications to that 😞
What exactly is important here in your opinion? I think in our instance we can just lay a duct if required and have it entering basement wall at a suitable location with the Internal ASHP unit and UVC etc nearby.
thanks for your input!