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No form of active solar (PV or hot water)is cost effective for space heating. In fact the install costs to heat a space that size could easily run to $50k. Passive solar is cost effective but that's a matter of building design and is seldom doable in a retrofit particularly for a space that big. I'm sorry to be the bearer of bad news but we stopped even quoting solar space heating because no one was willing to pay the price. Solar is cost effective for heating DHW and for general household power usage but not space heating.