For this job I performed a heating maintenance on an 8 year old Lennox heat pump 1. All electrical and mechanical components are clean and within manufacturer specifications 2. Did not change 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 kind of sudden power surges. Customer has opted to have surge protection installed Installed surge protection and ensured the system continues to operate in heating and cooling. System is in excellent condition and is operational upon departure. Thank you for choosing Cool Air Solutions.