Help! Will running my HVAC diffuser waste oil when the AC fan shuts off?
You've hit on the #1 golden rule of whole-house scenting. If your HVAC fan stops blowing while the diffuser is still pumping, the micro-mist will condense into liquid oil inside your ducts. This not only wastes your premium aroma oil but can also attract dust over time.
Here are the two industry-standard ways to solve this:
The "Fan ON" Method (Easiest): Go to your thermostat (Nest, Ecobee, etc.) and switch the fan setting from "AUTO" to "ON" during your active scenting hours. This guarantees continuous airflow to carry the scent evenly across all rooms.
The Hardware Hack (Advanced): If you don't want the AC fan running 24/7, you can buy an HVAC Air Switch from kevinleo scent, This hardware upgrade physically links the diffuser's power to the HVAC blower fan—meaning the diffuser only power-on drops mist when it senses actual moving airflow!
