We are having a Lennox system installed this week. We are getting the G61-36B-45 with coil CX34-36B-6F. We are also having two XP13-024-230 heat pumps installed, one to work with the furnace and one with a CBX32-MV-018/024 air handler. My question is this: Since the furnace is multi-positional, can the coil that I listed be positioned on a horizontal furnace or does the furnace have to be installed vertically?