Arrived on site, customer said all was well with normal unit operation. Although, expressed concerns over high heating bill in the winter. Upon initial indoor unit inspection, we noticed the units were using merv 16 air filters. Blower motors and caps were testing within manufacturer specs. Outside the downstairs unit was within specs in regards to start, run amps, capacitor and contactor. The upstairs unit however was ready 19.6 on the contactor and 29/35 on the capacitor. Both of these reading indicate that they are close to failing. Start amps and run amps were within specs. We also found that Both outdoor units had burn marks on the defrost control boards. We Washed outdoor condenser coils to maintain unit efficiency. We discussed the negative impact of the high merv rated filter, The upstarts was cooling its best with a 16 degree split. Recommendations: 1. Remove merv 16 filters and replace with merv 12 Honeywell. Discussed with wife how current filters can remove more particula