|[Diagram from the Drake's Landing website]|
|[Google Streetview image]|
I am thinking of how this could apply to the project I am working on in Surrey, about 90 houses. I still think that in the way that the British housing market works, ours would still be better off with a borehole each and a heat pump in each house, with no shared ducting required in either direction. We also do not have the large array of garages, and yes!, we do want to have most of the house roofs for PV. It's likely that a bulk order for 90 heat pumps would be cheaper than their combined district heating energy centre. (I know all the arguments in favour of district heating, but the Brits are peculiarly insular...) So, we are likely to go for wall mounted sunboxes, which I hope will be a proven technology by this time next year.
Okotoks is almost precisely the same latitude as Surrey, but has a continental climate, somewhat arid in summer, and long very cold winters. We will still pursue the idea of Sunboxes driven by heat pumps... but don't let anybody try to convince me that the idea is not going to work. Drake's Landing has exceeded expectations!