The energy.gov page has more details, it's 3.3 for air source at 47 deg F and a reasonable size: https://www.energy.gov/eere/femp/incorporate-minimum-efficienc

The energy.gov page has more details, it's 3.3 for air source at 47 deg F and a reasonable size: https://www.energy.gov/eere/femp/incorporate-minimum-efficiency-requirements-heating-and-cooling-products-federal#airsource https://www.energy.gov/eere/femp/incorporate-minimum-efficie...