Came out for 2 system maintenance. Our installs 1 yr old gas systems. Started by turning heat up at tstats. Once engaged checked all heating elements to verify proper heating sequence. Burners are firing properly, safeties are operating as designed. Filters were extremely dirty causing units to over condensate. Changed out filters (20x25)&(16x25) Return ducts are extremely dirty however rest of ducts are still in good condition recommend duct cleaning to keep systems in top condition as well as adding surge protection to protect against power surges. Thank you for your time and allowing me into your home.