The EcoFlow Wave 1 has cooled down my wife's office for more than a year just fine—we can't use a window AC there because it would block the fire escape. It's a little lighter than its predecessor at 32 pounds, yet has a higher 5,100 BTU rating (up from 4,000). And it can create enough negative pressure that the room can potentially suck in hot air from the outside. —Julian ChokkattuZero Breeze Mark III for $1,300: As WIRED contributor Chris Null notes (7/10, WIRED Review), the Mark III is both larger than the Mark II and quite a bit heavier, now 22 pounds. Each Mark III battery also has extra outputs that can be used for other devices—one USB-C port, one USB-A port, and a 12-volt DC socket.