Performed CMA on 2 Rooftop Gas Package Units. #1 - Carrier - Services Right Side of Building - upon arrival tech found system not operational. Manager stated system has not ran for years. Last tech notes stated compressors were shorted to ground. Tech was able to confirm this with multimeter and Megohm meter. Turned over to field supervisor department for follow up. #2 Lennox - Services Left Side of Building - no challenges present at today’s visit. The system is cooling properly and holding a delta t of 17-18 degrees. This system is having to work harder to make up for the other system not working. Filters changed and old ones disposed of.