In 2022, Bosch enhanced its Inverter Ducted Split (IDS) heat pump line to address low-temperature heating efficiency and system noise, achieving reliable performance down to -4°F (-20°C). The updated systems, including the IDS Premium Connected, utilize fully modulating inverters to maximize efficiency and reduce operational noise to as low as 56 dBA. For more details on the Bosch IDS system, visit bosch-homecomfort.com . IDS Premium Connected - Inverter Ducted Split Heat Pump