The answer to 'best HVAC system' is that there is no single 'best' HVAC system for all homes. The best system depends on factors like the size and layout of your home, your climate, your energy efficiency goals, and your budget. However, some HVAC systems are generally considered more efficient and effective than others.
High-efficiency systems like heat pumps, geothermal systems, and ductless mini-splits are often recommended for their energy savings and climate control capabilities. Properly sized and installed central air conditioning and furnace systems can also be excellent choices. The key is to work with a qualified HVAC technician to select the right system for your specific home and needs.