Customer has 17 y/o Ruud system that operates for whole house. Checked amp draws. Cleaned flame sensor. Cleared pressure switch tubing. Flue venting is incorrect for furnace and water heater. Gas line installation is incorrect. No form of water protection. Cleared condensate drain line. Blower wheel cleaning needed. Run capacitor is bad. Pressure levels are in decline. Compressor is failing. Condenser coils are very dirty. Bad dual capacitor. Breaker for AC is not sized properly. Informed customer of all findings. Based on our findings today, it might be time to think about getting a brand new system.