A standalone diffuser is plugged in and works anywhere there is an electrical outlet. An HVAC unit connects to your HVAC system and provides consistent and even coverage throughout a home or building. Our standalone units include the Mini360, DaVinci360 and our hybrid unit, the VanGogh360. The VanGogh360 can be used as stand-alone or be connected to your HVAC system. Our most powerful diffuser, the Museum360 can only be connected to the HVAC system and scents larger spaces.