Performed preventative maintenance on Lennox heat pump system. Drain tested through evaporator coil drain pan. System was maintaining temperature on arrival. Setpoint 72, house temperature 72. Homeowner changes own 20x24x1 air filters. Verified all other values per manufacturer specifications. Optional quote left for whole house air purifier. System is operating properly and ready for the season. Advised homeowner that air-flow issues for 2nd floor can be solved by adding a ductless split system. Homeowner advised they will call us if they’re interested in getting a quote for something like that.