For this job I performed a heating maintenance on a 7 year old Carrier furnace 1. All electrical and mechanical components are clean and within manufacturer specifications 2. Did not change the return filter as it is still clean 3. Found no surge protection on the system. Advised that if installed it will act as a shield to the unit in the event of any sudden power surges. 4. Customer mentioned their seasonal allergies. Informed that we do offer products that can help alleviate those symptoms and remove the viruses and bacteria from the breathable air supply. Customer opted not to move forward with recommendations at this time. System is in excellent condition and operational upon departure. Thank you for choosing Cool Air Solutions.