Dreo Portable Air Conditioner 740S review

Dreo's 740S is a dual-hose inverter unit aimed at medium rooms. Dreo lists 10,000 BTU on the DOE scale and 14,000 BTU on ASHRAE, with a room size of up to 400 sq ft. It is the only model on this list whose product page publishes a CEER efficiency figure, at 12, and Dreo also lists 235 CFM of air volume and an airflow distance of 19.7 ft. The lowest noise level is 42 dBA, which matches the Midea Duo. Dreo calls it drainage-free in environments below 90% humidity, so in most homes you will not need to empty a tank. The box includes a four-panel universal window kit for window heights of 20 to 53 inches, two 5 ft exhaust hoses, a drain hose and a remote. Control works through the Dreo app, the touch panel, the remote, Alexa or Google Assistant, and there is a 24-hour app timer. At $699.99 on Dreo's store it is the most expensive verified price here, and the 400 sq ft rating suits a bedroom more than an open plan room.

Who it is for

bedrooms and offices up to 400 sq ft that need quiet cooling

Price

$699.99 on Dreo's US store.

portable air conditioner 740s sale price $699.99 usd
Quoted from the vendor pricing page on November 14, 2026.

Key features

• 10,000 BTU DOE (14,000 BTU ASHRAE) adaptive inverter
• Dual hose design rated for up to 400 sq ft
• Lowest noise level of 42 dBA
• CEER of 12 and 235 CFM air volume
• Drainage-free in environments below 90% humidity

Strengths and weaknesses

• Strength: Only unit here that publishes a CEER efficiency figure (12)
• Strength: Two 5 ft exhaust hoses and a four-panel universal window kit included
• Strength: App, touch panel, remote and Alexa or Google Assistant control
• Weakness: $699.99 is the highest verified price on this list
• Weakness: 400 sq ft rating is smaller than the Whynter ARC-1230WN or Midea Duo
• Weakness: Draws 1,500 watts

Key facts

• Cooling (DOE / ASHRAE): 10,000 / 14,000 BTU
• Room size: Up to 400 sq ft
• Noise: 42 dBA lowest
• Efficiency: CEER 12
• Window fit: 20 to 53 inch heights

Where it ranks

Dreo Portable Air Conditioner 740S is No. 3 in our Best Portable Air Conditioners verdict.