Arrived on site to replace Electrostatic Filter, Removed filter from return grille noticed return grille dusty. Cleaned grille for client as courtesy. Checked thermostat noticed batteries need to be replaced. Client supplied AA Batteries for thermostat, inserted tested thermostat settings ok set to cool system ran ok. Reviewed work completed with client, emailed work summary. Client is also interested in receiving Dryer Vent service, recommended for client to contact the office for service.