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.

Don't take our word for it

★★★★★

“Love mine…32’ sailboat cools quick, plugs in for shore power or generator…way way way easier and cheaper than installing marine air conditioning unit. Works perfectly…good price.”

Scott Forgey
★★★★★

“when I had to replace a heat exchange hose in a 120deg engine room under way, I was extremely happy to have some cold Zero Breeze Air blowing on me so I could complete the repair”

Sean Kozar
★★★★★

“Boat V-birth. The bulkhead leads to anchor locker. Working on a trim piece to tidy up the holes. I run the drain hose into the anchor locker with the intake and exhaust. There is a drain hole at the bottom of the locker to drain the water that comes up with the chain and anchor. The top is vented to outside to let the heat out.”

Jay Swan
★★★★★

"Bayliner 2665. We got the cabin nice and cool. 54f air coming out of the blower and it’s almost 80f outside."

Nick Sanchez
★★★★★

"Unit is outside and I have made a cover out of a plastic box for inclement weather and the cool air is ducted in.Much quieter when sleeping that way and easy to lead the condensed water away."

Graeme Smith