Performed preventative maintenance for a Bryant ac system. Model # , serial # . Upon arrival I turned off the thermostat, powered the system down and removed the access panel. The evaporator coil’s are clean and in good condition. I tested the drain line to ensure that there are no leaks or clogs. The air filter looks like it was just replaced by the homeowner size 16x25x1. I inspected all electrical connections to ensure that they are secure and in good condition. I re attached the access panels and powered the system back up. I called for ac and observed the system starting normally. The condenser coils are dirty and in fair condition. The condenser amp draws are .56 for the fan and 8.14 for the compressor. The temperature split is at a 20° differential. The system is operating properly at this time. I cannot descale the tankless hot water heat. In order to descale the system I would have to isolate the system from the house. Whoever installed the system decided not to install the m