The most common types of HVAC systems are:
Heating and cooling split systems - The most preferred system that uses refrigerant compressors and coils to cool the air and a fan to blow hot air out.
Hybrid split system - Similar to a heating and cooling split system with the difference being that you can switch between gas and electric power.
Duct free (mini split) - Mounted on indoor walls and typically attached to an outdoor compressor. With a duct free system, you can turn the heat or air conditioning off in vacant areas to conserve energy and save money.
Packaged heating and air - Typically placed in an attic or top floor to cool and heat, a packaged heating and air system is a compact size that can be easily transported and used anywhere. This type of unit can be powered by gas or electricity.