Performed 3 system inspection. 1 rooftop gas package unit for front of building. This natural gas package unit would not heat due to rusted out draft inducer assembly, the majority of the furnace part was all rusted pretty badly. Although furnace part of package did not operate the cooling would come on and work. System that services backside of front building is a natural gas split system. This system is practically new, furnace was free of rust and was operating properly, although furnace working, it had some issues with the sediment trap, no proper fittings for code. Cooling system for this area new as well and no issues with cooling. System that services the back building is a natural gas rooftop package unit. While this system is a little older, did not see any issues for furnace part of package or for cooling part of package. Inspection details filled out in forms.