Performed maintenance on 6 year old Lennox unit. Cycled system for heat. Verified proper heating sequence of operations. Checked indoor unit electrical and heating components. Cleaned blower assembly and heating compartment. Cleaned flame sensor. Checked and verified proper heating operations and components are working accordingly. Blower wheel and evap coil are clean. Blower motor looks healthy. Whole home air purification system is working properly. Merv filter is dirty, went ahead and replaced with approval. Ductwork is all properly sealed and in good condition. Called homeowner cheryl and renewed membership as well, Cheryl approved to run card that’s on file. Cycled system, system is fully operational upon departure.