Performed heating evaluation on system, I found the equipment running and operating properly but I did find some bacterial growth within the indoor air movement system. I recommend having the air movement system pulled and cleaned and cleaning the indoor heat transfer media coil in place. If the cleaning is performed, I further recommend a Reme Halo air purification system to help prevent bacterial growth in the future. Follow up with client set for Monday after 11A.M. for potential decision on cleaning choice/Reme Halo/maintenance agreement.