The next step up is the multi split ac unit-- these systems have one outdoor fan unit and can have up to around 10 interior units relying on supplier. https://Pipewiki.org/wiki/index.php/At_The_Tricks_To_Hiring_Reliable_HVAC_Contractors_We_Comprehend_The_Significance_Of_Locating_A_Trustworthy_And_Dependable_Heating_And_Cooling_Service_Provider.