Quoted air conditioning repairs scheduled for a commercial customer in Santa Clara County. One package York AC need a new outdoor air screen, and a Dayton exhaust fan needed the blower motor replaced. Technician was returning after these repairs to cycle the heating on #4 on and off as site was reporting it wasn't working. After testing found no issues, unit was providing heat as expected. Checked out with onsite manager to go over thermostat use and confirm site was comfortable again.