Performed heating maintenance on the furnace system. Checked all electrical, mechanical and performance of the system. Cleared and treated the drain line and washed the outdoor coil. I talked to the homeowner about adding a water safety switch to the secondary drain line and removing it from the emergency drain pan line. They asked me to send an estimate for the repair as well as a surge protector for the furnace. No other major issues were found, and the system is operational at this time. See attached checklist for full tune-up details.