Preventative maintenence inspection on four geothermal systems. One Waterfurnace 5 Series package unit, three Carrier Package units, two vertical, and one horizontal. Second and thru floor units filter in clean condition. Basment system filter changed. Flush drain traps and drain pans. Test ran operation of all units from respective thermostats. Tested refrigerant on third floor Carrier system with refrigerant problems. Pressures are still within spec since Seth's visit on August first. Did not check refrigerant on other systems as there are no issues found or suspected. All systems are in operating condition and ready to go.