Arrived to do a maintenance on 2 carrier systems one I. The attic the other vertical in garage. I cleaned and flushed the drain line with water and cleaner. I checked the electrical system. I changed the filters with media, owner had there own filter media, 2-10x10x1, 1-20x20x1, 1-18x20x1, 1-12x18x1, 1-12x12x1. I recommended the following to keep the systems running like new: The surge protectors are to keep from burning up the board on the condensers. If you get high power surges or lightning strikes in the area it may burn up the boards. The start assists are to help start the condensers easier and last longer. The freeze protectors are to keep from freezing up the coils. If the blower fails or now air flow over the coils it it will freeze the coils. It’s time for your maintenance renewal for both systems. I do recommend the same plan for bot h systems. The systems are working great at this time. Thanks for using air now for all your air conditioning needs.