How large a space can the Mark 3 cool?

ZERO BREEZE rates it for about 100 to 150 square feet. It works best in a tent, a van or a single room rather than an open living area.

Does it need a power outlet?

No. It runs on a 48V DC battery or on 100–240V AC power, so you can use it off-grid and recharge or plug in later.

The rated noise level is 46 dB(A). That is noticeable in a quiet room, and owners say the higher fan settings are louder still.

Can it heat as well as cool?

Yes. It has a Heat mode rated at 1,700W, or about 5,800 BTU, which takes the edge off cool nights but will not replace a real heater.

What comes in the box?

The Basic version is the AC unit only. The battery and other accessories are sold separately, so check which bundle you are buying before you order.

Is it better than a window air conditioner?

A window unit of similar BTU cools more space for less noise, but it needs a window and stays put. The Mark 3 wins on portability and battery operation.

Where is the ZERO BREEZE Mark 3 Basic (AC Only) cheapest?

At ZERO BREEZE, for $1,219.00, as of our latest check.

What do buyers say about the ZERO BREEZE Mark 3 Basic (AC Only)?

Rated 4.6 out of 5 from 75 ratings.

ZERO BREEZE Mark 3 Basic (AC Only)

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$1,219.00at ZERO BREEZEChecked 3 min ago

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What reviewers say

4.6 / 575 ratings

Owners rate the Mark 3 highly, at 4.6 out of 5 from 75 ratings, and most praise its portability and quick cooling. Complaints center on noise and on how much power it draws.

What people mention

PortabilityPraisedOwners like that it is light enough to move between a van, a tent and a room.
Cooling speedPraisedReviewers say it brings the temperature down quickly in a small space.
NoiseCriticisedSeveral owners find it too loud to sleep next to on the higher settings.
Battery lifeMixedBattery power is the main draw, but owners report it runs down fast in Rocket or Cool mode.
Power drawCriticisedIts 150–500W draw is a lot for small solar and battery systems.
Room sizeMixedIt works well in a tent or one room, but owners say it cannot keep up in larger or poorly insulated spaces.

About the ZERO BREEZE Mark 3 Basic (AC Only)

The ZERO BREEZE Mark 3 is a portable air conditioner with a cooling capacity of 5,280 BTU. It also heats, with a heating capacity of 5,800 BTU. It is meant for spaces of 100 to 150 square feet, such as a camp site, van, trailer or tiny house.

It weighs 22 pounds and sets up in about 5 minutes without drilling or installation. It can run on a 48V DC battery or on 100V–240V AC power, and it cools 20°F in 5 minutes. An active drain system handles condensation, and the unit can also lower humidity.

Seven working modes cover cooling, heating, fan, dry, sleep and more. The thermostat holds a set temperature between 61°F and 88°F.

Cooling capacity

1550 W / 5,280 BTU

Heating capacity

1700 W / 5,800 BTU

Power use

150–500 W; cooling rated input 500 W

Coverage area

100 to 150 sq ft

Modes

Rocket, Cool, Sleep, Fan, Dry, Care, Heat

Fan speeds