Seasonal Energy Efficiency Ratio 2 — the current federal efficiency rating for air conditioners and heat pumps in cooling mode, measured under more realistic duct-pressure test conditions than the old SEER standard. Higher numbers mean less electricity per unit of cooling.
Around Baltimore, Annapolis, and the DC metro, cooling decisions revolve around humid Mid-Atlantic summers, correct sizing for row houses and older homes, SEER2 efficiency, and whether a repair or a planned replacement is the smarter long-term spend.