Hi. I'm a pizza restaurant franchisee and I'm going to be going into a 1,300 SF stand alone bldg. The landlord has agree to install two 5-ton roof units for me. He has now asked if he can just do one 10-ton instead. My thought was the two makes more sense, because in the winter months (when I don't need to run both on cool), I can just use the fan setting on one to supply my make-up air. Am I off-track? Will it make a difference having one or two? Thanks.