An air conditioner that runs in both directions: it cools in summer and, by reversing the refrigerant flow, extracts outdoor heat to warm the house in winter. Modern cold-climate models stay effective well below freezing — a real option in the Mid-Atlantic.
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.