Put shoe covers on upon entry to the house. Offered me the opportunity to watch and explained how parts operated and how efficacy was tested for the heater. Advised how to bring the humidifier up to snuff (replace the filter) if I didn't want to have them return to do it (for extra $$). Explained that the hot water heater was reaching its life expectancy and that a replacement would require an adjustment in the exhaust pipe for it to meet current specs.