Air conditioning in rental properties bill proposed in Montgomery County By Evan Lambert, FOX 5 DC Published July 16, 2019 News FOX 5 DC Share Copy Link Email Facebook Twitter LinkedIn Reddit CHEVY CHASE, Md. (FOX 5 DC) -- Lawmakers in a Maryland suburb will try to make air conditioning mandatory in rentals. It would be the responsibility of landlords in Montgomery County. FOX 5's Evan Lambert explains in the video player above.