There are 4 principal kinds of HVAC systems: Break up systems, hybrid systems, ductless systems and packaged heating and air systems. You'll want to select what’s best suited for your private home and spending budget.H? th?ng chiller m?ch n??c four Primary Secondary Stream • T?i m?ch n??c 3 và four thì h? th?ng s? d?ng chiller bi?n t?n ?? ch?