What is the difference between Inverter+ and Inverter++?Updated a year ago

While both models are highly efficient, less electrical power is consumed by Inverter++ in achieving the same capacity and output as the Inverter+ models, saving money as well. The Inverter++ (Energy Star™) models can also perform much better in frigid climates, with the ability to continue heating until outdoor ambient temperatures reach -13°F. This is in contrast with the Inverter+ series, which begins to lose heating efficiency at around the 42°F mark and will stop heating at 5°F.