One of the things I mentioned—and this is a very significant undertaking—is that here in North America, we are transitioning to a new refrigerant gas. We are currently using hydrofluorocarbons, or HFCs. HFCs happen to be a pretty potent greenhouse gas. Their global warming potential is thousands of times more than CO2. We are going to be transitioning to a new technology. These refrigerants will be hydrocarbons: propane, isobutane. One of the things you will see when we transition to these new refrigerants is a slight bump in energy efficiency. That just has to do with the thermodynamics of being able to compress and expand that gas.
On November 6th, 2018. See this statement in context.