With both exterior and interior filters, it really goes a long way towards keeping the interior of the HVAC system clean. I'm curious how good a job they do with moisture management though (i.e. keeping the heater core and rest of the HVAC system dry). Considering it's Tesla, I'd wager they're on point.

With some other manufacturers, especially legacy models, you'll usually have little to no intake filtering, and probably minimal cabin filtering. Combined with moisture retention inside the heater core due to design flaws such as insufficient fin spacing or an absent/inactive afterblow module, it can be very bad. For example: toxigenic fungii thriving on the excess moisture, contaminating the passenger compartment every time the blower fan is turned on.