Tech arrived on site. Did maintenance on a ducted mini split system and a head unit. Also a fresh air unit. Fresh air system was extremely dirty. Cleaned it out with a vac and wiped it down. Washed out the washable filters. Cleaned out filters on head unit. Replaced filter for ducted mini split. Cleaned outside condenser coils. Checked out electrical. All was good. Charge is good. Units are operational upon departure.