Cooling unit recommendations

[Hal]

Your situtation sounds similar to mine. I have just moved into an 1899 Limestone rowhouse in Brooklyn, NY. The foundation is stone and though I don't know the thickness, I guess 12-18". There is a small extension off the back of the house that is 7'x 11', with stone foundation on three sides and a stone pillar on the fourth, or interior wall where the door to the rest of the basement is. My foundation is 100% below grade. My temperature results are similar to yours: on recent heatwave days of 95-98 degrees, the cellar reached only 75. I should make it clear that although do intend to keep wine there, I am by no means a collector, nor do I indend to cellar expensive Bordeaux for 20-30 years. All things considered, I am perfectly happy with what will be my passive wine cellar. I am wondering if you have considered keeping your wine cellar passive. I have read just as much in favor of my situation as I have about keeping the temp a constant 55.