DCM2: AC complete, replaced 16x20x1 and 20x20x1 filters. Upstairs system is fully functional and operating within manufacturer specifications at this time. Refrigerant pressures and temperatures are appropriate for indoor and outdoor weather conditions. Main floor system is low 3-4lbs of R410A and blower wheel has dirt starting to build up, system is 11 years old and out warranty. Spoke with homeowners about issue and advised not to run system in AC due to the potential of the indoor coils freezing. Homeowner asked for estimates to be sent over and would reach out if they wanted an updated quote.