Zero Breeze Mark 2 Review: Tesla Of Portable AC Units

Push ‘On’ for cool air. That’s it.

This is the key premise of the Zero Breeze Mark 2 portable air conditioner. Ever since the invention of air conditioning technology, engineers have been trying to figure out how to make a truly portable air conditioner. 

No cords. Only batteries. Lightweight but still capable to deliver plenty of cooling power.

That was the desired combination; and the very direction the Mark II went in, as we’ll see in this Zero Breeze Mark 2 review.

zero breeze mark II air conditioner on a table
Zero Breeze Mark 2 is the first cordless battery-powered AC. A truly revolutionary device.

Here’s the deal:

  • According to Statista, more than 40 million Americans went camping in 2018.
  • More than 2 million people own small cabins with no electricity (that can get really hot in the summer).
  • 6.61% of people aged 30-49 own an RV.
  • Pretty everybody would also do well with a personal air conditioner when the heatwave sets in.

You can’t install a mini-split unit in a tent. In cabins, no electricity equals no air conditioning. RVs can get very how in the summer.

For all of this, ordinary air conditioners just won’t do. It took a big IndieGoGo campaign (grossing over $550,000) to bring us the Zero Breeze Mark 1; the world’s first battery-powered AC. It was a revolution.

But there were also complaints. ‘It’s not powerful enough’. ‘It blows hot air right back in my face’. ‘It takes an hour to drop the temperature by 18°F’.

It’s only understandable that the 1st device of the new cordless AC technology won’t be 100% foolproof. Zero Breeze learned a ton with the Mark 1. 

Quick Assessment Of Zero Breeze Mark 2 (Specs-Wise)

That’s why Mark 2 is so tremendous. All the misgivings people had with the Mark 1 were taken into account, improved upon, and today’s assessment of Zero Breeze Mark 2 looks like this:

  • It’s powerful (can produce 2,300 BTU compared to 1,100 BTU Mark 1; the key is the new rotary compressor).
  • It’s dual-hose (one hose for inflow air, second for heated outflow air; Mark 1 was single-hose and blew hot air right in your face).
  • At full cooling speed, it can drop the temperature by 30°F in 10 minutes. That’s just outstanding for a battery-powered air conditioner.

In this Zero Breeze Mark II review, we’ll go through every aspect of the new battery-powered AC. We’ll look into the cooling capacity, battery life, dual-hose tech, energy efficiency rating (EER), and all associated specs.

If you in a hurry, here’s the all-in-all summary:

Zero Breeze Mark 2 is, for a lack of a better word, amazing. It’s seamless to use, lightweight, powerful enough for cooling tents, cabins, RVs, even boats. It’s exactly what we hoped it will be.

The challenging part is the price. Mark 2 costs more than $1,000 and, quite frankly, that is quite a lot even for an ordinary air conditioner. However, Mark 2 is as far from the ordinary as possible. It’s revolutionary need tech, and all advanced technology does come at a steeper price point.

It can, however, offer you what no other AC unit can:

  • Completely portable air conditioner (you can literally carry it in your hand).
  • Actually appropriate cooling power.
  • Most importantly, bragging rights. Just look at it; everybody will be jealous that you have it.

All in all, the Zero Breeze Mark 2 is pretty much the best engineered AC unit we ever reviewed. You can check the current price and buy it here (also watch a cool video):

How Does Zero Breeze Mark II Work?

For all intents and purposes, pushing ‘On’ and ‘Off’ may be your only interaction with the Zero Breeze AC. If you look deeper, however, you can see how the whole device works:

Mark 2 operates exactly like a standard portable air conditioner. The only difference is the power source:

  • Standard ACs are powered by the electrical grid.
  • Mark II is powered by a 24V battery.

Like a standard AC, Zero Breeze Mark 2 follows the same refrigeration cycle. The difference is that the compressor, evaporator, expansion valve, and condenser are tightly packed into the 20″L x 10″W x 11″H dimensions of the Mark II:

cycle of how zero breeze mark 2 cools the hot air
Mark 2 utilizes the same regeneration cycle as other AC units to cool the air.

The compressor, obviously, is the key to this process. Mark 2 has the new rotary compressor, an upgrade from the Mark 1 compressor. It’s so impressive that Zero Breeze often uses ‘The Only Rotary Compressor Battery-Powered AC’ in their marketing material.

zero breeze ac unit with rotary compressor, evaporator, expansion valve, condenser, dual hose exhaust and cool air exhaust
Key parts of the Mark 2 portable air conditioner.

In the front: Evaporator, with the cool air exhaust. That exhaust is the source of cool air Zero Breeze air conditioner produces. With Mark 2, you also get an exhaust hose; you can effectively direct the cool airflow. This is very useful when you’re using it as a personal AC unit.

In the middle: Compressor, the heart of every portable AC unit, together with the expansion valve.

In the back: Condenser, with the dual-hose exhaust. The dual-hose is what you want; one hose to draw in normal-temperature air, and the second one to exhaust the hot air. The hot air exhaust needs to be vented out of the tent, car, RV, boat, etc. You can have the electrical plug and drain there as well.

Specification Rundown

battery powered air conditioner along with specification sheet
Power Source: 24V Lithium Ion Polymer Battery
Cooling Capacity: 2,300 BTU
EER Rating: 3.54
Power, Voltage, Amps 650W (24V, 27A)
Noise level: 52 dB
Weight: 16.5 lbs

Battery

If the condenser is the heart of a portable AC, the battery is undoubtfully the bloodstream.

Mark II comes with a large 24V lithium-ion battery. The major drawback of Mark I was the 12V battery; this is improved in the new Zero Breeze AC by using the 24V voltage.

Battery capacity is 35Ah or 840Wh. The previous model used a 43 Ah or 477 Wh battery.

depiction of battery that powers the zero breeze mark 2 portable ac unit
The upgraded Mark 2 smart battery is the bloodstream that makes Zero Breeze AC viable.

Zero Breeze Mark II has battery has +76% capacity compared to Mark I battery.

In optimum conditions, this is enough to run the battery-operated air conditioner for about 5 hours. Realistically, however, 3 hours is a more appropriate timeframe of how long the battery lasts.

You can recharge it with:

  • Just plugging into a wall socket.
  • Using a car’s cigarette lighter (in-car charging).
  • Even with solar energy (you can connect it to solar output).

All in all, the battery itself is quite miraculous. Having such a great battery is a necessary condition to run any battery-operated AC unit.

Here’s the telling part: If you want to buy just the battery (and you can), it costs $799. That’s quite a lot for a simple battery, right? That’s just an indication that the Zero Breeze Mark 2 battery is not ‘simple’ at all. It’s the key innovation element that makes Mark 2 possible.

Cooling Capacity And Temperature Drop

Of course, an air conditioner, even a battery-powered portable one, is no use if it can’t provide us with a cooling effect. 

With Zero Breeze, we need to keep in mind that this is not an AC unit meant to cool down the entire home. Even a small room would be a problem.

However, the 2,300 BTU cooling power the Mark 2 generates (Mark 1 generated only 1,100 BTU), is perfect for smaller places such as:

  • 2-4 person tents (perfect for camping).
  • Cars (especially bigger ones; SUVs and vans).
  • RVs.
  • Boats (not yachts, obviously).

In such small spaces, the Mark 2 works best. In fact, it can even drop the temperature by as much as 30 degrees in 10 minutes. That’s quite an achievement on its own.

camping in nature with a 4 person tent
Zero Breeze comes especially useful on camping trips (during the hot summer nights).

The smaller room air conditioners, for example, have 6,000-8,000 BTU capacity. Compared to that, 2,300 BTU seems quite small.

However, 2,300 BTU is enough to cool down 115 sq ft room (with 8 feet high ceiling). According to an EPA recommendation regarding the capacity of air conditioners, you can cool down almost 1,000 cubic feet of air with the Zero Breeze’s 2,300 BTU capacity.

That’s actually quite a lot of cooling power. Yes, some concerns were with Mark 1 because it had a 1,100 BTU cooling capacity. The upgraded Mark 2 with 2,300 BTU cooling capacity is well-equipped to cool down even bigger spaces.

EER Rating And Power

To produce those 2,300 BTU, the Mark 2 smart battery has to generate a serious amount of power. 650 Watts, to be exact. 

The 24V voltage makes the 650W possible; the Mark 2 top amperage is 27 amps. 

The No. 1 factor when deciding which portable air conditioner is the best is its energy-efficiency. In fact, we even made a list of the best portable AC units based on energy-efficiency

You might be shocked to find out the following:

Mark 2’s EER rating (Energy-Efficiency Rating) is only 3.54. The best portable air conditioners have a 10+ EER rating.

This is a major con not only of Zero Breeze but of all battery-powered air conditioners. Battery-powered technology just does not allow for high energy-efficiency. There are certain physical limitations to that and that’s just the reality of all battery-operated AC units.

Nonetheless, it has to be said that in the world of battery-powered units, the Mark 2 has the highest energy-efficiency rating.

Noise Levels And Weight

Imagine you’re camping in Colorado. You’re in nature, maybe you even have to hike to the site where you plan to put up a tent. In this pristine quiet nature, you want 2 things from your portable AC:

  • A quiet device (you don’t want to listen to it or disturb nature).
  • A lightweight design (carrying it shouldn’t be too hard).

If you reading a Zero Breeze Mark 2 review, you realize that this battery-powered device is both. The 52 dB level is about the same noise level as your fridge:

decibel scale for mark 2

Keeping the weight down, however, is a more difficult job than keeping the decibel levels down. That’s because you need a battery, and batteries with as much juice as the Mark 2 battery are heavy.

Zero Breeze keeps the Mark 2 lightweight by using lithium-ion batteries. This is usually a smartphone strategy; iPhone, for example, has a lithium-ion battery that can accost to more than 70% weight of the iPhone.

It’s similar to Mark 2 design. By using the lightweight energy, the Zero Breeze engineers managed to create a battery-power AC with 2,300 BTU of power that last for up to 5 hours that weighs only 16.5 lbs.

Here’s what 16.5 lbs mean:

  • You can’t carry it for 5 or 10 miles …
  • … but you can easily walk up to a mile with it, or easily put it in a car, RV, or a boat.

With all these Zero Breeze Mark 2 specifications attested for, let’s summarize the review in a pro-and-con kind of way:

Zero Breeze Mark 2

Pros
  • Revolutionary technology: The holy grail of portable air conditioners successfully unlocked
  • Great improvements: 2,300 BTU cooling power, 24V lithium-ion battery
  • Quiet (52 db) and lightweight (16.5 lbs) – perfect for camping
  • Most energy-efficient battery-operated AC unit
  • Amazing design that will earn you all kind of bragging rights
Cons
  • It’s pricy due to new technology
  • Low energy-efficiency all battery-operated units have (EER rating = 3.54)
  • Can be used only for up to 5 hours before the battery needs to be recharged

Verdict: The 1st Class Battery-Powered AC Is 1st Class

New technology – the 1st class of devices that comes out – usually aren’t brilliant. The same is true for Zero Breeze. Zero Breeze Mark 1, that is.

Going over the Mark 2 specs, however, it’s no wonder that this is widely considered the 1st class battery-powered portable AC unit. Specs-wise it’s brilliant, it has a killer design, and, sadly, a killer price as well.

With everything considered, the Mark 2 is the single most brilliant AC unit we have ever reviewed. If you have deep enough pockets, this is exactly the device you have to take for a camping trip.

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