What does EA 2.1 refer to in the context of energy efficiency?

The reference to EA 2.1 in the context of energy efficiency pertains to Basic Insulation. This credit focuses on ensuring that residential buildings have an adequate level of insulation to minimize energy loss and maximize energy efficiency. Proper insulation contributes significantly to maintaining indoor temperatures, thus reducing the reliance on heating and cooling systems. High levels of insulation not only improve comfort levels for occupants but also lead to lower energy bills and a reduced environmental impact by decreasing the energy demand for maintaining a comfortable indoor climate.

While air infiltration, heating and cooling distribution systems, and refrigerant management are all related to energy efficiency, they do not specifically relate to the EA 2.1 designation as clearly as Basic Insulation does. Air infiltration concerns the uncontrolled flow of air through the building envelope, the heating and cooling distribution system deals with the effectiveness and efficiency of the method used to deliver conditioned air, and residential refrigerant management focuses on the proper handling and disposal of refrigerants to prevent emissions that are harmful to the environment. EA 2.1 specifically emphasizes the importance of thermal protection through proper insulation materials and installation, making it the correct interpretation of this energy efficiency credit.