Performed an A/C pm. Blew out the drain line, washed the air filters. Rinsed the condenser. Checked the electrical connections, checked the pressures and temps in heating and cooling. Heat- 125*F, cooling-49*F. added 1 lb 10 oz R410a to the system. The blower wheels are getting dirty with dust. Recommend having the blower wheels cleaned. System is operating properly.