Finished a tune-up on the system. Indoor unit: noted biological growth around the blower/plenum area. I mentioned low ventilation; the homeowner said roof ventilation was recently addressed. Recommended installing a UVC-200 germicidal UV unit, with a complimentary blower fan cleaning. Outdoor units: one system already has a soft start and it’s performing well. The homeowner requested a soft start on the newer unit—it’s already paid; we’ll schedule installation for Tuesday the 23rd (office to confirm). Additional note: homeowner reports one bedroom is noticeably dusty