Tech performed two system ESA, tech made recommendations for each unit. Bryant package-tech found bacterial build up in unit and recommended plasma, tech also recommended surge protection to protect major components from power surge and potential lightning strike. Payne package- tech recommended surge protection to protect major components from power surge and potential lightning strike.tech found no issues with system operation at this time. Both systems are back on and operating properly at this time. Customers are interested in adding mini splits to ESA, and said they would add them at next visit due it being TTE at that time. Customers have washable filters.