Preventative maintenence inspection on 2020 Waterfurnace 5 Series running in great condition. Replaced air filter. Insp3cted blower and compressor compartments for any damage or loose wiring. None found. Test ran operation of auxiliary heating. All heat strips are operating properly. Also tested operation of geothermal heating. No issues found or suspected as system is operating properly withing specifications for temperature rise, blower Amp draw, and refrigerant pressures read from Aid Tool. Per Tim's request, auxiliary backup differential is set to 4° below set point, and auxiliary lockout set to 40°. Both ofthese done in attempt to limit the operation of auxiliary heat. If the system is having very long operation times and causing auxiliary to run on a frequent basis, it s recommended to have a home insulation evaluation done to help conserve energy in the home. Waterfurnace is operating properly, efficiently and ready for Winter.