Manufacturers now have technology that lets contractors monitor HVAC systems remotely, apps that link them directly to their customers, and ignition modules that can be configured with the touch of a button on a smartphone and provide diagnostics as well. Accessory integration — thermostats that control not just heating and cooling, but also a humidifier or dehumidifier, and can monitor IAQ security — plus programs that help less experienced technicians learn faster were also in the mix from controls makers at the 2023 AHR Expo in Atlanta.