Portable AC Showdown: 2.6-Gal Water Tank, 4 Modes, Fast Cooling for Sweltering Days We've tested our fair share of cooling solutions, but this 3-in-1 portable AC unit truly stands out. With a 2.6-gallon water tank, it delivers up to 40 hours of continuous relief-perfect for those endless summer days when the AC is out of reach. The evaporative cooling system works quietly, while the four modes and three speed settings let us tailor the experience to our needs, whether it's a gentle breeze or a frosty blast. As windowless units, they're a game-changer, eliminating the hassle of installation. We're impressed by how quickly they lower temperatures, even in cramped spaces, and their sleek design makes them a stylish addition to any room. While not a full-room solution, they're a reliable companion for targeted cooling. For a budget-friendly, flexible alternative to traditional ACs, this unit earns its place in our top picks.