This new air conditioner from Dometic won’t cool your entire boat down—unless it’s a rather small boat—but it’s ideal for a sleeping cabin or a small saloon. The self-contained 3,500-Btu unit measures 91/4″ @ 15″ @ 8″ and will fit in a locker or under a V-berth. It’s powered from the boat’s house batteries via an integral inverter that also lets you connect other 115-volt appliances to it. It draws 30 amps of DC power and costs $1,699. Dometic Corporation, 800-321-9886, www.dometicusa.com