I had a Lennox dual fuel system installed recently and so far so good. I am trying to get a state rebate but need a certification. The installer can't provide one. They couldn't say why but I found out from Lennox that this system is a mismatch. The local dealer says it is ok. The heat pump is a xp19-036-2-30, the air handler is a CH33-43C-2-F-3 and the furnace is a G61MPV-60C-091. Lennox says the system is not supposed to go together that way. It is good for ac but not heat. I think the local dealer should be on the hook for the rebate and needs to answer why they put the system together that way. Anybody with thoghuts on this subject can comment. Thanks