AL RETZLOFF’S CARD ROOM WILL RAISE YOU ONE First there’s the 5-ton A/C unit, installed so that guests of the late chemical executive and Indy car sponsor “could open the floor-to-ceiling doors facing the number 13 ladies tee box” at the neighboring Houston Country Club “while staying cool,” says the current owner of 302 Shadywood Rd., who’s now listing it for sale. The opposite wall, however, made it harder to get through to Retzloff and his pals: Windowless and 10-in. thick, it served “as a security feature against drive-by shootings.” Up top, “The TV came out of the ceiling using a 3/4 horsepower motor.” And on the roof directly above was a full-service helipad — but not for long: “The neighbors and the HOA shut it down due to the noise.” [Previously on Swamplot] Photo: HAR