Carrier Model # CH14N06000GAAAA Serial # 0820X41095 Completed a preventative maintenance on a 2 year old carrier unit. Did a temperature split it was 20 degrees also, did a amp check on the condenser fan motor and compressor, both are operating properly. Made sure unit was draining. Capacitor is in range of its specs. System is operating properly at this point. Filter size 16x25x4