It had occurred to me that the tech will improve for air source. The house will be low permeability, well insulated and require relatively little heating. The ventilation system is a definite yes, hence the good sealing (trickle vents not needed). I'm looking at the cost and effectiveness of strapping some air conditioning on to it.
We'll use underfloor heating and I intended to see to what extent the gas boiler installation can be optimised for conversion to air source at a later date (possibly by somebody else).
The planning requirements plus plot orientation make the roof difficult unless we just stick the solar on the front somewhere. Planning also means it will be a fairly conventional looking house in brick with clay tile or slate roof.
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