The Department of Energy (DOE) has received a petition from Hussmann Corporation requesting an exemption from their current testing procedures for certain CO2 direct expansion unit cooler models used in walk-in coolers and freezers. The existing test conditions are not suitable for these models because CO2 behaves differently from other refrigerants. DOE has issued an interim waiver allowing Hussmann to use an alternate test procedure while they gather public comments and make a final decision. This interim waiver will help ensure the accurate testing and representation of the energy efficiency of Hussmann's products.
Simple Explanation
Hussmann Corporation asked for special permission to use a new way to test how energy-efficient their coolers are because they work differently with CO2. The government let them try this new test for now while they decide if it should be allowed permanently.