Sleeping in a Cool Cabin.
Sleeping in a Cool Cabin.
Try ZERO BREEZE Mark 3 AC
Why Boaters Choose Mark 3
Low power draw
Flexible power
Easy setup
Quiet operation
Mark 3 runs on just 150 to 500 watts, depending on your cooling mode and cabin temperature.
Runs on DC or AC — with or without shore power.
No install, no modifications. Just drop it where you need cooling, run the hoses through a hatch or portlight — and that’s it.
Cools effectively and runs quietly — so you can actually sleep through the night.
Use It Your Way
Whether you’re sailing off-grid or prepping on land, Mark 3 works with whatever system you have:
⦁ ZERO BREEZE battery packs: 2–7 hours (1 battery), up to 14 hours (2 batteries)
⦁ 48V DC system — with the correct cable
⦁ Inverter or shore power
⦁ 12V / 24V systems — with a step-up converter and proper cable
If your setup can deliver 600W of stable DC power, you’re good to go.
Where Does the Hot Air Go
Mark 3 uses a dual-hose system — like a mini-split air conditioner, but all in one compact unit, making cooling more efficient.
Two Front Vents:
⦁ Intake vent: Draws in air from your cabin or berth to cool it.
⦁ Exhaust vent: Expels the cooled air, keeping your space comfortable.
Two Back Vents:
⦁ Intake vent: Pulls in fresh air to cool the air conditoner.
⦁ Exhaust vent: Pushes the hot air outside, venting it away.
Most boaters vent the hot air through a hatch, side portlight, or into a vented anchor locker by connecting the rear hoses. Some users place the unit outside and run the front hoses to draw air from the cabin and vent hot air out — just like adding an external A/C to your space.
Cool Where It Matters
Mark 3 isn’t built to cool your entire interior — and it doesn’t need to be.
It’s made for the spaces that heat up first, and matter most:
- V-berths
- Aft cabins
- Cockpits with canvas zipped up
- Any small sleeping cabin
When you're anchored and there's no breeze, this is the space you care about.