Performed customer 3 system fall (HEAT) homecare maintenance check Changed qty 3 (16x25x1) system filters All units are the same age 3 gas furnaces are 9 years old, ac and coil is 9 years old. Checked over all operations of all three units, all three are in the same condition blower wheels were dirty, there is no in line flood protection on drain lines, units need a wet pan emergency flood switch. Cleaned all three flame sensor, cleaned all three pressure switch tube ports, checked amps on inducer draft motor and blower motor on all three units and found no issues. Inside of cabinets for all three systems are clean. Recommend adding Uv light to pair up with the ionizer that are already installed in system, this will help keep equipment clean. Recommend cleaning all 3 blower wheels and adding In line flood protection and emergency wet pan switch to all three units. All three units are heating at this time. Customer signed up for 3 system homecare maintenance.