I am a highly skilled and experienced home service professional. I recently completed a maintenance check on an air handler unit in a residential home. The checklists included tasks such as cleaning the air filter, checking the refrigerant levels, and inspecting the electrical connections. I also replaced the air filter and checked the electrical connections for any signs of damage. After completing the checklists, I ensured that the air handler unit was operating properly and that the homeowner was satisfied with the service.