Inspected two furnaces for heating inspection. Both blowers are pulling good amps. Pulled and cleaned both flame sensors. Both systems burners are clean. Ensured both upstairs drain and downstairs condensate pump are removing water properly. Changed 16x25x1 filter and 16x25x4 filter. Found systems have float switches but not TE standard wet switches. Brought this up to customer’s attention and he declined the installation of wet switches. Both systems are not protected by uv light. Highly recommended customer add uv lights to ensure system stays clean and air inside home stays clean. Both furnaces are operating and heating well at this time.