In about 2013, a few brands began introducing standard AC and heat pump models that included inverter technology. Carrier Greenspeed was among the first, followed by units from Lennox, Trane/American Standard and Bryant (Carrier’s sister brand). The technology is also called variable-capacity, variable-speed and modulating when applied to standard split systems. The industry has also begun to use the same terminology – inverter-driven – as in the mini split market.