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Hi All, I hope someone sensible can help point me in the right direction or offer some useful comments on our project...! We'd initially planned to heat the whole place using an oil fired boiler with a wet system - underfloor tray system for the office space with warm air blower to keep frost off the warehouse space in the winter. But now we're wondering whether we can heat the office area appropriately with an ASHP throughout the year, possibly supported with PV panels on the roof? (It's a large roof, approx 250sqm is south facing, unobstructed - we can trim the trees). Outline as follows: We have a steel portal frame barn which we're converting into a warehouse with internal offices. The existing asbestos roof and steel sides will be replaced with insulated Kingspan panels (KS1000RW 100mm for roof and 73mm for the sides - both with U Value of 0.18 W/m2). The building measures 25m x 17.5m, average height is 5.25m. (see plans) Within the building is the office, which measures 8.3m x 15m x 2.6m. Ignore the additional small building on west side it's being demolished. When it's -3 deg C outside we'll need to maintain approx 10 deg C in the warehouse and 22 deg C in the offices. The place is only occupied during normal office hours. i.e. I'm not worried about keeping it warm at night, just that it doesn't freeze! We guess our heat demand would be approx 4kW for the office area and 16kW for the warehouse. (Maybe someone can tell me if this is miles off?). How can I work out how much energy an appropriately sized ASHP will USE across the year? Furthermore, we've got a great big roof area relative to the size of the office to be heated so can Solar be used to power the ASHP for most of the year? I guess in depths of winter when it's grey and wet the contribution would be minimal... at the time when the ASHP will be doing the most work and COP would be at its worst? What would a sensible output of PV be? Any advice warmly welcomed! Many thanks, Sven Proposed.pdf Floorplan.pdf birds eye.pdf