Silver club fall tune up on 2014 Carrier Infinity furnace. Asked about how homes are cooling and heating, as customer also has home next door. Filters do need to be changed. Customer will change them out this evening. Changed customer supplied batteries on outside sensor for thermostat. Customer just had roof replaced a few months ago, so inspected flue to make sure it is still run properly, and all looks good at this time. Cleaned flame sensor and burner crossover points. Inspected inducer and blower cabinet. Checked evaporator coil and drain. Checked thermostat controls. Cycled system on and measured gas pressure, replacing caps. Checked amp draws and sensors. Measured heat rise and inside delta t. System is operating well at this time.