5 Best Ventless Air Conditioners In 2021 (No Window Access)

Cold air in. Hot air out. That’s the basic thermodynamics of every air conditioner.

For that ‘Hot air out’ part, every air conditioner needs an exhaust hose to vent the hot air out. Of course, you’re probably looking for a ventless air conditioner. What is a ventless air conditioner?

“Ventless air conditioner is an AC unit that doesn’t require a vent through the window in order to function properly.”

In the HVAC world, there is no such thing as a ventless air conditioner. This is a phrase to describe evaporative coolers (swamp coolers). These can provide a powerful cooling effect without the need for venting:

top ventless air conditioner that doesn't need venting
hOmeLabs Air Cooler is the #1 evaporative ventless cooler (more on that later on). It does not require any sort of venting.

Let us be frank:

Physics can’t be bent. An air conditioner without a vent has no way of how to dissipate the heat. Example: You have a portable air conditioner without window access. It’s physically impossible to create a hot-cold air conditioner exchange without proper ventilation.

ventless air conditioner inner workings sketch
Basic ‘Cold air in, hot air out’ principle all air conditioners use. Physics law determining the heat exchange: 2nd Law of Thermodynamics.

Note (more later on): That doesn’t mean that ventless coolers don’t exist; they do, create a cooling breeze that cools us but doesn’t decrease the overall temperature. If you are standing in the wind, you will feel colder, but the temperature will be the same; the perceived temperature will change.

These evaporative coolers are the best ventless AC-like units. Their main advantage is that, unlike all air conditioners, they don’t need to be vented. That’s the ‘air conditioner no windows’ problem solved.

If you have a windowless room you want to cool, or if you for some other reason cannot adequately vent an air conditioner, you do have a problem. Everybody understands the struggle of having a hot place that’s impossible to cool down with a standard AC.

What Are Ventless Devices That Can Cool You?

Everybody who’s looking for a solution on the internet will come across articles that feature ‘Top 10 Best Ventless Air Conditioners’. It is important to understand that none of those HVAC devices is a cooling air conditioner. They both fall into two categories:

  1. The ventless air conditioner is not actually an air conditioner without a vent. It’s just a normal portable air conditioner.
  2. It’s an evaporative cooler. Evaporative coolers are, in the HVAC community, known as ‘make-believe air conditioners’ or ‘fake air conditioners’. They create airflow and do work as a glorified fan; however, they don’t actually decrease the temperature in the room. Every single one of them produces the same amount of cooling effect: Exactly 0 BTU.

That being said (very important):

With one exception – the #5 Zero Breeze 2 AC unit that is quite expensive – you only have two choices if you want to get some cooling without the need for a vent:

  1. You can realize that there are no ventless air conditioners; true AC units that have 5,000 BTU, 10,000 BTU, or 15,000 BTU of cooling effect. You can check the truly best portable air conditioner here, window air conditioners here, and ductless mini-splits here.
  2. You invest in the very best evaporative cooler. While coolers don’t have an HVAC-certified cooling effect, they do cool you quite effectively. They create the cool airflow that evaporates the moisture from our skin, and this cools our body. Especially the ones that use ice water are most effective. None of them require venting to work properly.

The evaporative coolers from hOmeLabs, Hessaire, and reliable Honeywell and Black+Decker portable air conditioner without hose are the most optimum choice for everybody who can’t properly vent an air conditioner.

Before we look at all the best 5 ventless AC options, let’s clarify what are some of the most basic specifications to check before buying an HVAC unit that doesn’t require venting:

3 Basic Things What To Look For When Buying A Ventless AC Like Unit

Ventless evaporative coolers can be very good, or they can be very bad. The key to how to cool yourself without using any vents is the powerful airflow these coolers create.

High Airflow

The higher the airflow, the better. If you look in the table below, you will see that Hessaire MC37M far outpaces all other coolers. On that specification alone you can see that this is the best portable air conditioner without a hose; it cools you quickly and effectively.

Low Noise Levels

High airflow can create quite a lot of noise. In engineering these ventless coolers, there is a desire for a good balance between airflow and noise levels.

A cooler that doesn’t need to be vented at all and creates 1000+ CFM of airflow is rather useless if it generates 70+ dB of noise. In the table of the best ventless coolers below, you will only find ventless AC-like units that are considered quiet or very quiet.

Addition Of Ice Tank

Evaporative coolers use cold water to generate the cooling effect. Cold water is good; ice is even better.

It’s hard to find an advanced ventless cooler that has a tank. That’s why hOmeLabs B089KQWY4V is such a terrific AC-like unit. It has a 10-liter tank that can hold ice.

ventless air cooler with ice tank
hOmeLabs B089KQWY4V has a 10 L tank that can hold ice. Check #1 review for more.

Ice has:

  • Lower temperature than water.
  • Much higher cooling capacity than water.

Of course, you will have to get ice somewhere which is not always easy. However, if your end goal is to have an air conditioner that doesn’t need to be vented through the window, having an ice evaporative cooler is a superior choice to the water-only cooler.

Reliability (Importance Of Good Respectable Brand)

Most of the well-recognized HVAC companies don’t produce ventless evaporative coolers. Rather, they produce air conditioners that need to be properly vented.

A respectable brand is the best guarantee for quality and reliability. Honeywell and Black+Decker are two respectable companies that vent into creating their own ventless coolers.

Hessaire, on the other hand, is a good example of a smaller brand that specifically vent out and designed the best portable air conditioner without a hose. That’s what was missing on the market and Hessaire fulfilled that needs.

That is also why Hessaire MC37M is by far the biggest cooler that doesn’t need to be vented.


All in all, considering all these specifications, LearnMetrics has created a list of the best AC-like units that need no venting. Here is the full best-of list, with individual reviews (you can find them below the list):

Best Ventless AC-Like Coolers (That Actually Cool You Down)

Ventless AC Unit #1 hOmeLabs Air Cooler #2 Hessaire MC37M #3 Honeywell TC10PEU #4 BLACK+ DECKER BEAC75 #5 Zero Breeze Mark 2
Photo:
Tank Size: 2.6 Gallons (ICE Water Tank) 10.3 Gallons / / No Tank
Max. Airflow: / 3100 CFM 194 CFM / 152 CFM
Power, Voltage, Amps: 130W (120V, 1.1 A) 250W (115V, 2.4 A) 145W (120V, 1.2 A) 90W (120V, 0.75 A) 650W (24V, 27A)
Noise Levels: / 59 dB / 65 dB 52 dB
Price: $$$$ $$$$ $$$$ $$$$ $$$$
Average Rating: 4.9 out of 5 stars 4.4 out of 5 stars 4.1 out of 5 stars 4 out of 5 stars 3.9 out of 5 stars
Availability: Check Price Check Price Check Price Check Price Check Price

1. hOmeLabs B089KQWY4V (Best Ventless Air Conditioner In 2021; With ICE Tank)

ventless ac like unit with ice water tank
Tank Size: 2.64 Gallons (You can even fill it up with ice)
Max. Airflow: /
Power, Voltage, Amps: 130W (120V, 1.1 A)
Noise Levels: /
Dimensions (LxWxH): 14.7″ x 13.1″ x 34″
Weight: 18.5 lbs
Price: $$$$
Rating: 4.9 out of 5 stars

hOmeLabs B089KQWY4V is quite a unique ventless cooler; in the most positive way possible. Their tagline is ‘What’s cooler than being cool?’ and they have an ice-cold argument for that; quite literally.

hOmeLabs B089KQWY4V is one of the few evaporative coolers that have an ice tank. 2.64 ice tank, to be exact. That allows it to create a cooling breeze that is way colder than with cold water.

With ventless air conditioners or coolers, lowering the temperature of the source of cooling is of utmost importance. If you start with cold water, you will achieve a lower cooling than with ice.

In comparison, ice has a much higher cooling capacity; it will last much longer than plain water. Obviously, the drawback hOmeLabs B089KQWY4V faces is that you need to get ice, if you want to unlock the extreme cooling capacity. No ice, no high-efficiency cooling.

In short, as far as ventless air conditioners go, hOmeLabs B089KQWY4V is the closest to the real BTU rating of standard air conditioners, primarily because it has the option to add ice to the 10 L tank:

hOmeLabs B089KQWY4V Review

Pros
  • Best ventless cooler that can use ice to create a cold breeze
  • Made by hOmeLabs, a name of some renown in the HVAC world
  • Doesn’t require any venting
Cons
  • You need to get ice if you want to use ice-cooling
  • Airflow and noise levels are not specified

1. Hessaire MC37M (Very Big Ventless AC-Like Cooler)

evaporative cooler that works as air conditioner but doesn't need to be vented
Tank Size: 10.3 Gallons
Max. Airflow: 3100 CFM
Power, Voltage, Amps: 250W (115V, 2.4 A)
Noise Levels: 59 dB
Dimensions (LxWxH): 24″ x 16″ x 38″
Weight: 39 lbs
Price: $$$$
Rating: 4.9 out of 5 stars

Hessaire MC37M is by far the best and, as a consequence, best-selling big ventless cooler. Hessaire is a company that specialized in engineering coolers, and the MC37M is their best and most popular model.

As you know, if you truly want to have ventless AC-like cooling, you need massive airflow. Hessaire MC37M is capable of creating enormous 3,100 CFM airflow that can cool down places up to 950 sq ft in total. That’s just incredible to achieve with only the evaporation process.

In comparison, other ventless units can create 200 CFM, or maybe 300 CFM. Hessaire really double-downed on creating a truly supercharged chilling ventless AC-like unit (of course, you can lower the airflow if it gets too cold).

Generally, high airflow ventless units have high noise levels. Hessaire MC37M is designed really well and created only 59 dB of noise. That’s on par with the quietest portable and quietest window air conditioners.

The supercharged Hessaire MC37M does require more energy than other low airflow units; 250W to be exact. That’s much less than ordinary vented AC units but still more than 200 CFM coolers.

All in all, given the supercharged airflow (3,100 CFM in total), and the specialized cooler focus by Hessaire, the Hessaire MC37M is by far the coldest (and thus best) cooler that doesn’t need to be vented:

Hessaire MC37M Review

Pros
  • Ultimate big ventless AC-like cooler
  • Generates a grand total of 3,100 CFM (10x more than other coolers)
  • Has a quiet operation; with 59 max. noise level
  • Very affordable given the quality, reliability, and cooling capabilities
Cons
  • Does require a little more electricity; powered by 250W (other ventless coolers require 50-150W)

3. Honeywell TC10PEU (Cheapest Ventless Air Conditioner Like Unit)

best honeywell ventless air conditioner
Cooling Capacity: 0 BTU
Max. Airflow: 194 CFM
Power, Voltage, Amps: 145W (120V, 1.2 A)
Noise Levels: /
Dimensions (LxWxH): 11.5″ x 11.6″ x 29.6″
Weight: 14 lbs
Price: $$$$
Rating: 4.1 out of 5 stars

Honeywell is one of the top brands in the HVAC industry. They make everything from air conditioners to dehumidifiers, and so on. In recent years, they have also developed a model that everybody looking for a ventless air conditioner will love: the Honeywell TC10PEU.

Honeywell TC10PEU is a solid and reliable device. First of all, all hats of to Honeywell to write precisely what the Honeywell TC10PEU does; or, at least, not to claim this is the best ventless air conditioner in the market.

“Mimic the comfort of a cool lake breeze.”

This is the Honeywell TC10PEU tagline and it’s exactly what this ventless device does. It is a spot cooler and cools your immediate area; and, best of all, it doesn’t need to be vented.

The unit generates 194 CFM of airflow. To be fair, that’s about average for a standard spot cooler. You can plug it in any 120 V electrical outlet and you have the immediate cooling effect without any exhaust hoses that would need to be vented out of the window.

The best thing about Honeywell TC10PEU is the price. With a price tag of below $200, this is the cheapest ventless AC-like device you’ll find. Honeywell, in general, has a good reputation to produce budget-friendly and reliable devices, and the Honeywell TC10PEU cooler is not an exception.

All in all, this is one reliable and cheap air conditioner-like cooler that doesn’t need to be vented. It’s an affordable and decent choice:

Honeywell TC10PEU Review

Pros
  • Made by Honeywell; reliable and affordable
  • Cheapest good ventless cooler on the market
  • Incredibly easy to use; just plug in and feel the breeze
Cons
  • It does have below 200 CFM airflow; not all that intense cooling

4. BLACK+DECKER BEAC75 (Reliable Ventless AC Like Unit)

Reliable Ventless AC Like Unit
Cooling Capacity: 0 BTU
Max. Airflow: /
Power, Voltage, Amps: 90W (120V, 0.75 A)
Noise Levels: 65 dB
Dimensions (LxWxH): 13.6″ x 15.8″ x 36.6″
Weight: 17.0 lbs
Price: $$$$
Rating: 4 out of 5 stars

BLACK+DECKER BEAC75 has a similar story to the Honeywell TC10PEU. BLACK+DECKER is a reliable company that makes a whole range of HVAC devices; the BEAC75 is the version of a ventless cooler that can dub as an air conditioner without the venting needs.

It has all the features a cooler should have: 3 different fan speeds (Low, Medium, High), and 4 operational modes (Normal, Natural, Sleep, Smart). It is designed as a ventless cooler for your immediate surroundings.

It has an easy-to-use control panel and quite appealing design, characteristic of most BLACK+DECKER HVAC devices.

At high speed, however, it can produce up to 65 dB noise. That’s a lot less than the high airflow units, but it’s not ideal.

BLACK+DECKER BEAC75 is available at a very budget-friendly price. Similar to Honeywell ventless AC-like unit, it costs less than $200:

BLACK+DECKER BEAC75 Review

Pros
  • Very easy to use with the user-friendly control panel
  • 3 fan speeds, 4 operational modes
  • Made by BLACK+DECKER; a reliable brand
  • Costs less than $200
Cons
  • We don’t have full info on airflow dynamics
  • Sounds levels at High speed can reach 65 dB; not ideal

5. Zero Breeze Mark 2 (Best Battery-Powered “Ventless” Air Conditioner That Works Without A Window)

ventless air conditioner that doesn't need a window to vent
Cooling Capacity: 2,300 BTU
Max. Airflow: 152 CFM
Power, Voltage, Amps: 240W (24V, 10 A)
Noise Levels: 52 dB
Dimensions (LxWxH): 20″ x 10″ x 11″
Weight: 16.5 lbs
Price: $$$$
Rating: 3.9 out of 5 stars

There is only one real ventless air conditioner. Not an AC-like cooler, but a true HVAC heat-pump and refrigerant-based air conditioner; the battery-operated Zero Breeze Mark 2.

It’s a remarkable device. This ventless AC unit produces 2,300 BTU of actual cooling effect. Compared to 0 BTU all other coolers produce, the Zero Breeze Mark 2 is the ultimate choice if you need an AC that doesn’t have to be vented.

About the venting part: Does Zero Breeze Mark 2 magically break the basic rules of the 2nd Law of Thermodynamics that, translated, clearly state that ‘there cannot be an air conditioning cooling effect without a vent’. Not at all; Zero Breeze Mark 2 is an almost ventless air conditioner. It does create a much much lower ‘hot air out’ airflow and thus needs only limited venting.

Given that it creates a real air conditioning effect, the Zero Breeze Mark 2 does require a whole lot of energy more than 0 BTU coolers. With 650W, it can generate, as we have stated, 2,300 BTU of cooling effect.

The important aspect is that, due to the lower airflow needed, it’s also whisper-quiet compared to other ventless AC units. That’s because it was designed as a perfect air conditioner for tents; can’t sleep with a noisy AC unit, right? At its maximum BTU output, it generates only 52 dB of noise.

Zero Breeze Mark 2 only has one drawback, and it’s a major one. The price. This is a superbly made unit only affluent people can afford. Full with the battery, it costs more than $1,000.

All in all, Zero Breeze Mark 2 is an actual air conditioner that requires minimal venting, and it generates a real cooling effect. No other cooler will lower the temperature in the room; Zero Breeze Mark 2 is the only minimal-venting air conditioner that will do that, and do that remarkably well:

Zero Breeze Mark 2 Review

Pros
  • The only true air conditioner that requires minimal venting (can’t bend physics, of course)
  • Can generate 2,300 BTU of cooling effect compared to 0 BTU of cooling effect coolers create
  • It has an ultra-quiet operation; you can even sleep with it in the tent
  • Superb engineering, aesthetics, and reliability
Cons
  • It does cost quite a lot; only affluent people can afford it

Ventless Air Conditioners FAQ

Air conditioners or AC-like units that don’t require venting are quite a phenomenon and there are quite a few questions our readers might be needing an answer to.

To accommodate this, here are some of the most frequently asked questions regarding ventless air conditioners:

Do Ventless Air Conditioners Work?

No, and yes. Ventless air conditioners are not exactly air conditioners at all; they are evaporative coolers that use airflow to create a cooling effect. They have 0 BTU cooling effect but can make you feel colder.

“Mimic the comfort of a cooler lake breeze” is the best way to describe this type of ventless air conditioner. If you’re standing in the wind, you feel cooler, right? The temperature is still the same but you feel cooler due to the evaporation process on your skin.

This is exactly how ventless air conditioner-like cooler work; they create an airflow that cools us, but they don’t decrease the overall temperature like standard air conditioners.

Are There Any Portable Air Conditioners That Don’t Require Venting?

Again, yes and no. No actual air conditioner can work without the ‘hot air out’ venting; that’s just basic physics.

There are air conditioners that require minimal venting. Example: You can check the #1 Zero Breeze Mark 2; the best overall ventless air conditioner on the list above. It’s battery-powered and hence works as the ultimate portable air conditioner; you are not limited by any wires.

Is there a portable air conditioner that doesn’t need a window?

Yes. The truly ventless cooling devices are called evaporative coolers or ‘swamp coolers’. They create airflow and cool you like a cool wind; they do not, however, lower the overall temperature of the room like portable air conditioners that need to be vented.


For all other questions, you can use the comments below and we’ll try to help you out.

11 thoughts on “5 Best Ventless Air Conditioners In 2021 (No Window Access)”

    • Hello Randall, as stated in the article, physics simply just doesn’t allow for a no-vent AC due to heat exchange principles. The best you can do is to reduce the venting to a minimum with something like Zero Breeze Mark 2.

      Reply
  1. Once you have checked out all the options available in the market for a central air conditioner, then the next step will be to conduct an online search. With a little research, you will be able to find out which companies manufacture the best air conditioner brands.

    Reply
  2. This article doesn’t quite seem to grasp the facts of evaporative coolers and thermodynamics. Evaporative coolers can lower the actual temperature of the air. Hot dry air in, cool humid air out. The process of the water evaporating into the air takes energy (read, heat) out of the air. In already-humid environments, the water can’t evaporate, no effect. In dry environments, the air temperature will actually decrease with a swamp cooler.

    Also, the Zerobreeze is an interesting inclusion. Thermodynamically, no, it will not provide any cooling. It may blow cool air towards the user, but at least as much energy as it removes from the air to cool it down must come out the exhaust port.

    Consider, if you are drawing 650W from the power socket and don’t have a vent, all that energy must be dissipated into the room. That’s conservation of energy.

    Reply
    • Evan, thank you for an insightful observation. You’re right; evaporative coolers can be used to lower air temperature. However, the term ‘air conditioner’, by definition, should provide cooling output, measured in BTUs. Zero Breeze, for example, has a rated 2,300 BTU of cooling output. Evaporative coolers, on the other hand, have 0 BTU of rated cooling output. As such there cannot be categorized as ventless air conditioners per se, but you’re right, they do provide a cool breeze based on the water evaporation principle.

      Reply
  3. Great article on Ventless Air Conditioner! This article is very helpful for me. Thanks for shearing such a kind of informative article.

    Reply
  4. The truly ventless cooling devices are called evaporative coolers or ‘swamp coolers’. They create airflow and cool you like a cool wind; they do not, however, lower the overall temperature of the room like portable air conditioners that need to be vented. Consumer Reports tests find that these heavy units are iffy at cooling—and hardly portable. Think of portable air conditioners as the cooling choice of last resort. They’re better than a fan but far from a window AC.

    Reply
  5. Are evaporative coolers or AC-like ventless coolers not useful or effective in climates with higher humidity? Eg. North American East Coast climates vs. West Coast climates? In my research, I’m learning this may be the case, especially when trying to cool an interior room in an East Coast house. I already need to use a dehumidifier to control high humidity levels in my basement. We have a ductless AC unit in our hottest east-facing room to cool down our 2nd floor, and use air circulators to push the cool air to our west-facing master bedroom that does not have an AC unit. I’ve been looking for alternatives than having to add another ductless AC unit. Hence discovering evaporative coolers. But wondering if they are ineffective where I live.

    Reply
    • As far as humidity is concerned, the basic difference between evaporative coolers and air conditioners is that evaporative coolers increase the humidity (like humidifiers) and air conditioners lower the humidity (like dehumidifiers). Now, it’s not the best idea to use an evaporative cooler in an already high humidity environment; the humidity will be further increased. But if you need a ventless solution, you can’t really use an air conditioner, and you’re basically forced to use an evaporative cooler; it will cool you down, but it will further increase the humidity. Humidity can then be lowered by a dehumidifier but, you’re right, this is not the most optimum solution, it’s just the only one available.

      Reply

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