Best AC Units for Rooms with No Windows (2020 Reviews)

| Last Updated: September 18, 2020

Spaces devoid of windows or openings allowing natural air circulation and cooling are nothing unusual. Basements converted into condos, dressing rooms tucked out in some sultry corners in the house, and other spaces enclosed by walls can be hard to ventilate.

But this doesn’t mean these drab spaces can’t be converted into well-lit and ventilated areas. In this guide, let’s talk about how you can use different kinds of AC units to ventilate your dingy space and turn it into a cool joint.

Comparison of the Best AC Units for Rooms with No Windows 

  • Four Distinct Modes of Functioning: Heating, Cooling, Dehumidification, and Ventilation
  • Superior Energy-Efficiency With 17 SEER (cooling) and 9 HSPF (heating) Ratings
  • Automatic Swing Air Louvers for Perfectly Even Air Distribution
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  • Best Evaporative Cooler
  • 4 fan speeds and great for medium-sized rooms
  • Designed with adjustable humidity control and rhythmic wind mode
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  • Best Portable AC (Vented)
  • 14,000 BTU
  • Cools area up 350 sq. ft or warms 375 sq. ft. room
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  • Best Through-the-wall AC
  • 9,800 BTU and EER of 10.7
  • 3 cooling speeds and great for areas up to 440 sq. ft.
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The Challenges of Cooling a Room Without Windows

Poorly ventilated rooms have poor air circulation. It makes them hot, damp and even stuffy. Likewise, the humid air inside the room will clog your AC´s condensate drain unit making it overwork, overheat and eventually break down. Ultimately, you incur high maintenance costs that could otherwise be avoided by using a customized cooling unit.

What Size of AC Unit Do I Need?

The size of an AC is usually measured in terms of BTUs. And the size of your model largely depends on the area you are looking to cool with that air conditioner. If you keep this one factor in mind, then you will automatically get better efficiency and lower costs. 

If the room is too big, then the AC unit will not cool properly, and if the room is too small, then the AC will cool too soon without properly reducing humidity. 

Usually, it is smart to get 20 additional BTUs for every extra sq. ft. in your space.

Area (sq. ft.)

Capacity (BTU)

150 - 250


300 - 350


400 - 450


450 - 550


our top 3 picks for AC Units for Rooms with No Windows

  • Has 4 fan speeds
  • Great for medium-sized rooms
  • Adjustable humidity control
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  • 12,000 BTU heating capacity
  • 110/120 vac voltage
  • Meets UL standards
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  • Versatile
  • 14,000 BTU
  • LED digital display
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Review of the Best AC Units For Rooms With No Windows

Often times, rooms that have no windows are also compact in size. This means that whatever the cooling system you are to settle for, it should fit into the available space. And it shouldn’t be noisy and should basically work without the need for constant monitoring.

Fortunately, you do not need to fabricate your own custom-made cooling system. There are already numerous and very efficient hybrid systems designed to operate in poorly ventilated and compact spaces. Here are four such systems to choose from:

Minisplit System

This is a ductless AC designed to sap air from the outside and hence cooling down the room. A mini-split air conditioner is a hybrid structure consisting of a window unit, a central air unit and a condenser. During installation, the condenser is placed outside and then connected to an evaporator placed high up inside the room. The merits of sourcing for a Minisplit system are:

  • The outdoor components make the system compact enough to fit into small spaces such as small basements and dressing rooms. The indoor evaporator can also be placed in any appropriate point inside the room. Thus it won’t stand in the way of items such as furniture or lighting components.

  • Since the condenser, which is the noisier part of the system, sits outside the room, the whole system is generally quiet. It makes this cooling system ideal for rooms such as a man cave or a dressing room. Or a relaxation joint where silence is of utmost importance.

  • The system is flexible and can be zoned so that you only cool individual rooms when the need arises.

Best Minisplit System:
Pioneer WYS012-17

Pioneer Air Conditioner WYS012A-19 Wall Mount Ductless Inverter+ Mini Split Heat Pump, 12000 BTU-110/120V

  • Has a 12,000 BTU heating capacity.
  • Powered by a 110/120 vac voltage.
  • Ideal for single zone residential use.
  • Also suitable for light commercial applications.
  • Meets UL standards.
  • Evaporative Air Cooler

    If you live in a low-humidity area, the evaporative air coolers can provide a cost-effective way to cool your house. Evaporative air coolers work on the principle of evaporation. By accelerating the natural heat exchange process.

    Basically, the system has a pump that draws water from a reservoir and delivers it to cooling pads on the back part of the cooler. Filter pads placed at the back of the system suck in the warm, dry air in the room. And force it to flow over the damp pads causing the water to evaporate. The evaporation cools the hot air thus making your space more hospitable.

    Why Install an Evaporative Air Cooler in Your Room

    • An evaporative air cooler operates smoothly and quietly. You can thus install it in basically any type of space, be it your dressing area, bedroom, or your favorite relaxation area in the basement.

    • The whole unit costs much less compared to some other ventilating systems. As it is free standing and doesn’t come with an exhaust vent hose. Compared to some other power-hungry cooling systems, the non-motorized swamp air cooler only needs water to chill your space. This lowers operational and maintenance costs.

    • Evaporative air coolers are also ventless meaning that you won’t need to alter the room. Or make ugly holes on the walls to vent the system to the outside. This means you can install it with ease and start using it right away.

    Top Evaporative Cooler:
    Honeywell CL201AE

    Honeywell 525-790CFM Portable, Fan & Humidifier with Ice Compartment & Remote, CL30XCWW, White Evaporative Cooler, 525 CFM

  • Has two wheels for portability.
  • 288 watts of power consumption.
  • Has four fan speeds.
  • Equipped with oscillating louvers for even distribution of cool air.
  • Portable Air Conditioner

    Portable air conditioners tower over the crowd. They are extra efficacious, produce little noise during their operation and can double up as a dehumidifier and a fan. You’ll find these energy-efficient cooling units easy to move around the house. And this makes them suitable for apartments where other central AC units may not fit. So, how do you benefit by opting for a portable air conditioner?

    • Can comfortably cool a large space.
    • The unit is programmable to suit your needs.
    • Specialized filters clean up the air.
    • The dual hose leads to efficient performance.
    • Eco-friendly.

    Best Portable AC (Vented):
    Black+Decker BPACT14HWT

    Black + Decker 7,500 BTU Portable Air Conditioner with Heat, 14,000 w, White

  • Versatile as it comes with cooling, dehumidification, fan, and heating modes.
  • Equipped with programmable, electronic controls to ease operation.
  • Powerful enough to heat up to 250-325 sq. ft of space.
  • A LED digital display keeps you posted on the room temperature.
  • Includes 4 feet,11 inches hose for better positioning.
  • The unit carries up 7,500 BTU of heat.
  • Through-The-Wall Unit

    Through-the-wall AC units offer a more permanent cooling solution as they emit the heat from the exterior part of the home’s walls. These self-contained cooling units come with wall sleeves that secure the unit on the walls. Through-the-wall units are versatile enough for installation on any space.

    Comparison Between Window AC Units And Through-The-Wall Units

    Through-the-wall units mainly vent from the rear section minimizing possibilities of warm air re-entering the room. Window AC Units vent the heat from both the rear parts and the sides.

    Window AC units are easily portable. Thus can be brought in only when the need arises. Through-the-wall units are a rather permanent fixation.

    Window AC units can only be fitted on the windows and, as such, you must get measurements right during the purchasing processes. Also, a poorly fitting Window AC unit may lead to leakages and inefficiencies. Through-the-walls are conveniently fixed on holes, made to specifically fit the unit.

    Best Through-The-Wall AC:
    LG LT1016CER

    LG LT1016CER 10,000 BTU 115V Remote Control Through-the-Wall Air Conditioner, White

  • It has a 9,800 BTUs capacity and cools up to 450 sq. Ft of room space.
  • It has 3 fan speeds to choose from.
  • It has an EER (energy efficiency Ratio) of 10.6.
  • Fitted with a Mesh filter to clean the air.
  • There are different ways to cool and refresh a room lacking windows. The kind of system to install in a room depends on a variety of factors. Including space available, portability, associated costs, and humidity of the environment.

    The units herein have a wide application, and can certainly fit into any space. Or adapt to any existing climatic condition. Check out what fits your space and enjoy the convenience of having a cooled space in the midst of searing heat.


    You no longer need to worry about living in a room with no windows. With some of the best options mentioned above, you can say farewell to hot, damp, or stuffy air. These various hybrid systems will deliver you a peaceful and comfortable closed space without any problems.

    People Also Ask

    Buying a closed-space air conditioner can be a tricky business and a little risky. So, you must have a bunch of queries about it. We tried our very best to answer as many queries as we could. Take a good read and satisfy your curiosity.

    How to Vent a Portable Air Conditioner With no Windows?

    Without a window, you can vent your portable unit through either a dryer vent, a wall, or a drop-ceiling. You can use all or any of these options to efficiently and effectively ventilate your room and portable AC with no problems.

    Do All Portable Air Conditioners Have to Be Vented Out a Window?

    Portable air conditioners need to be vented out as they always draw hot air like every other air conditioner. If you want the space to be cooled efficiently by your unit, you need to allow hot air flow outwards. You can do it through any of the above methods.

    Are Portable Air Conditioners Effective?

    Portable air conditioning units will never be nearly as efficient as central units, but they can still be trusted to keep the indoor temperature at 78 degrees F, the widely recognized temperature we feel comfortable at, or under if feasible.

    My name is Bob Wells and I am a retired HVAC tech from Washington state. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. Find more info about me and HVAC Training 101.