Since ancient times, humans have been using technology to lower air temperatures during hot seasons. In Egypt, they would hang wet pieces of cloth to evaporate and cool off the air, and wealthy people in the Roman Empire circulate cold water in indoor pipes. Thanks to an American engineer Willis Carrier, the first modern air conditioner came onto the scene in 1902. Now more than 100 years later, AC options are aplenty. When combined with more eco-friendly practices, our favorite air conditioners are extra effective—and won’t obliterate your energy bill.

4-way deflection: LG 8,000 BTU 115V Window-Mounted Remote Control Air Conditioner

Takes Up No Space On The Floor

A solid choice with three cooling speeds. Amazon

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This LG air conditioner can be set on a timer with a smart outlet, and works well with smaller windows and rooms. The low fan speed is fairly quiet, which is good for lighter sleepers, and air blows up, not out—which means you’ll be cooled evenly while you sleep instead of getting blasted in one spot. It also features an energy-saving mode and remote control with a digital thermostat.

Super powerful: Honeywell HL14CESWB Air Conditioner, 14,000 BTU, Blue/White

Easy-To-Clean Filters

A built-in dehumidifier helps with spaces that have excess moisture. Amazon

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For a sleek, no-install option, this Honeywell portable air conditioner is powerful and reliable. Though it comes at a higher price point, it can cool rooms up to 700 square feet in size and has a vertical wind motion to evenly distribute cool air. It also features three fan speeds, a sleep mode, a 24-hour energy-saving timer, and an easy-to-use digital display.

Anywhere you go: ENKLEN Portable Air Conditioner

Filters Out Odors And Dust

Comfort in any room. Amazon

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Don’t break a sweat if your office AC goes kaput—this USB charged portable air conditioner will cool things down… It runs for up to six hours and is lightweight, which makes it handy for travel. As a bonus, it filters out odors and dust from the air.