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2x New Heatpump Installation

I need 2 New Heatpumps installed in a 2 story house. the units would be very close to each other, and would heat(cool) 2 adjacent rooms each side of the passageway. The units are to be installed in the downstairs, but i was thinking it might be simpler if the exterior units sat on the roof of the first level, where the interconnecting pipes etc could be as close as possible