My roof top unit kept freezing up last trip. I pulled it apart and cleaned the coils on the fan side and squirrel cage sides. Noticed my Fan start Capacitor was very corroded so going to replace that. Not sure how much longer this thing will last. I think its the original unit that came with it from 1995. What is the current most reliable brand/model? I have read mixed reviews on Domatic brisk 2. Was leaning more to the Coleman MACH 15. ANY Suggestions?