Residential Rental Apartments - Air-Conditioning Requirement

SB 12 requires landlords to provide air-conditioning in most residential rental units during summer months (June 1-September 30) to maintain indoor temperatures at or below 80°F. It applies to apartment buildings with four or more units, excluding historic properties, buildings constructed between 1940-1950, and specific Baltimore public housing units. Landlords must ensure AC systems are functional for tenant-controlled units or maintain temperature limits for landlord-controlled systems. New constructions must comply starting June 1, 2026, while renovated units with major electrical or heating upgrades must comply starting October 1, 2026. The law does not affect buildings with permits issued before the law’s effective date.