1 time maintenance Completed maintenance on one of 2 systems in the home (upstairs 4 ton). Checked all electrical components for proper volts and amp draw. Both fan motors and compressors tested good. System pressures and temperatures are correct. Electric heat kit is working properly. Cleared drain line and added solvent to break up any debris. Air handler has very heavy biological growth. The system has an economy uv light and Reme halo system with expired bulbs. I discussed options for cleaning, replacing bulbs, and upgrading to a medical grade uvc light system. I have attached quotes to the invoice for these options. Home owner also wanted a quote to change out the float switches from a circuit style to a standard float switch. Due to age and condition of the system I also discussed replacing the system. The home owner just moved in and would like to wait to replace until a later date. Homeowner declined maintenance program at this time. System cooling at this time.