Heat pump system for a 5-plex?

I have a 5-plex that has 4 700 sq-ft 1 br apts, 2 on main floor, 2 on second floor (each with large living room, eat-in kitchen, medium sized bedroom,… I have a 5-plex that has 4 700 sq-ft 1 br apts, 2 on main floor, 2 on second floor (each with large living room, eat-in kitchen, medium sized bedroom,…Read MoreGreenBuildingAdvisor