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hasEnergyEfficiencyCategory

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Defines the energy efficiency Category (which could be either a rating out of range of values or a yes/no certification) for a product according to an international energy efficiency standard.
Values expected to be one of these types
EnergyEfficiencyEnumeration
Used on these types
EnergyConsumptionDetails

Source

https://github.com/schemaorg/schemaorg/issues/2670