HVAC+ is the Whole Home option in the current waterless diffuser lineup. Use it on a tabletop, mount it to a wall, or connect it to a compatible HVAC system to distribute scent more broadly through your home. What makes it stand out Flexible installation: Choose tabletop, wall-mounted, or HVAC-connected placement based on your home. Tuya app plus on-device control: Adjust the available output from the diffuser or through the app. 280 ml capacity: The larger oil bottle supports a whole-home scenting setup with fewer bottle changes. Published under 38 dB: A useful consideration for an always-present home system. DIY-friendly HVAC connection: The included 1.6 m HVAC tube is designed for customer installation into a compatible system when the provided directions are followed. How to use Choose tabletop, wall-mounted, or HVAC-connected placement and complete the installation as directed. Fill the oil reservoir with compatible waterless fragrance oil, then connect the 12V power adapter. Start with the lowest available output and adjust gradually using the on-device controls or Tuya app. Good to know HVAC+ is corded and includes the diffuser, empty 280 ml bottle, 12V power adapter, and 1.6 m HVAC tube. Compatible waterless fragrance oil is sold separately. Use waterless fragrance oil only—never add water. For the best experience when changing scents, clean the oil reservoir with Waterless Diffuser Cleaner, then run the cleaner through the diffuser to clean the inner mechanism.