What cooling mode SEER rating should an air source heat pump have at a minimum?

The minimum SEER (Seasonal Energy Efficiency Ratio) rating for an air source heat pump is established to ensure a baseline level of energy efficiency in cooling performance. A rating of 13 SEER serves as this minimum standard. This standard was implemented by the U.S. Department of Energy and reflects advancements in technology aimed at reducing energy consumption and increasing efficiency in residential heating and cooling systems.

In contrast, ratings above 13 SEER, such as 14 SEER or 15 SEER, represent higher efficiency levels, which can result in greater energy savings and lower utility bills but are not the mandated minimum. Therefore, an air source heat pump must have a minimum SEER rating of 13 to comply with regulatory requirements, making B the correct choice.