Best 15,000 – 18,000 BTU Air Conditioners: Portable, Window, Room

Summer is always an anticipated season in all parts of the world. Summer entails the promise of a good vacation and time away from studies or work. It finally lets you have the chance to tend to your summer garden and make use of your lawn & garden tractor and leaf mulcher. However, let’s be honest here. The scorching heat that summer brings can be pretty dreadful! Sometimes, my thoughts stray to using our heavy-duty utility sink to act as a pool with how high the temperature gets! Summer is nothing but sweat and lightheadedness. Overheating appliances without a working air conditioner is the worst!

To fully enjoy the perks of summer, getting one that can cool you down is more of a necessity rather than a luxury at this point. It’s especially the case with the worsening global warming that we’re experiencing!

And if you’re scouring the internet on what kind look for, you’ve come to the right place.

I’ll outline the important features you should look out for in units and give you some brands with the best 15,000 18,000 BTU air conditioners. I’ve also done a buying guide on other units with 5,000 – 6,000 and ones with 12,000 – 14,000 BTU cooling power. Check those out if you find out that your room requires a unit with a different amount of power. Not familiar with what “BTU” is? Read on to know more!

Things to consider

AC units on a building
Things to consider 
Room sizeIs your place rented?
TypeWindows or not

There are many different types on the market, often categorized by cooling power. They are also commonly categorized by installation type and size. Most people buy the most powerful model they can afford, which is a huge rookie mistake! Before you shop for one, you should take note of the limitations of your space/area first. You should take note of the size of your room or how spacious it is. Take note of the number (or presence) of windows and whether you can make permanent changes in your room. All of these things determine factors when choosing the type and power.

  • Room size determines the needed cooling capacity or British Thermal Unit (BTU).
    • Each level corresponds to a certain cooling capacity. Not all models can cool down a 400 sq.m. area—a bigger space would require higher BTU.
    • Buying one with the wrong amount of power is just a waste of money because it won’t be able to cool down your area properly. It can be wasteful in energy. (We’ll discuss the specifics of why this happens later.)
  • The available space in your room will be a determiner of what type your room can accommodate.
    • If your room is already crowded with a lot of appliances, buying a portable standing model might be a disadvantage. It will decrease your working/floor space even more.
  • Windows are an important factor when it comes to ventilation and/or water drainage.
    • A lot of models require windows, especially window-mounted ones because that is where the unit will be mounted. Some portable options also need windows because they have window kits that are installed for ventilation and drainage systems.
  • If you’re living in a rented place, it’s better to opt for a portable or window model because these are temporary fixtures.
    • If you’re just renting out a space, you can’t make permanent changes to the area. Making a rectangular hole at the wall to install a through-the-wall unit is impossible. If you’re planning on purchasing one for your spacious home, then you’re free to get one that can be a permanent fixture. An example of such could be a through-the-wall ones or a central system unit.

To enlighten you further, let’s discuss the types based on how they are installed:


Portable air conditioners (PACs) came about because of the need for more compact and portable models. On top of that, they tend to be affordable and lightweight. The release of these units was beneficial to those who couldn’t afford and accommodate large, powerful options on the market.

They are perfect for living in a rented apartment or dorm because they don’t need a big renovation to install one. It is a compact, self-contained system usually free-standing. Installation can be pretty quick and easy, so one can easily move it from one space to another. All you need is a certain spot on the floor to situate a PAC on and a window for units with window kits. The kit consists of a venting system installed at the nearest window to expel warm air outside or to another location. With this type, you’ll have flexible installation options. Some models even have wheels and handles for better portability!

A portable model can effectively cool and dehumidify a single room. If you’re looking for one for your RV, you might find RV roof air conditioners to be too expensive. You can use a portable RV AC unit instead. Most multipurpose models can operate as afans, dehumidifiers, or air conditioners Earlier on, the cooling capacity of PACs was limited to small rooms. Nowadays, a lot of them have high BTU/cooling capacity and are capable of operating efficiently in 800-1000 sq. ft. areas.

Besides cooling power, they can also differ in water/moisture drainage systems. Most standard ones require manual water removal. These units usually have a catch basin or container that collects the moisture.

You have to empty it periodically. Other models have gravity drain and condensate pumps. A drainage hose (different from the venting system’s hose) is attached to the unit. It directs the water to the other end of the hose. More advanced units are already equipped with self-evaporative features that include evaporation of moisture. It leaves out of the same exhaust hose that the venting system uses. For convenience, opt for self-evaporative features. You won’t have to manually drain the water or find another area to direct the drainage hose.


Compared to PACs, window models are slightly more difficult to install because the whole unit must be put within the window frame. But suppose you compare the ease of installation of window ones with through-the-wall units. The former is easier to install than the latter.

This type is popular among homes and apartments. It’s quite easy to install and would only require the presence of a window or two! Usually, when you buy a window model, your purchase includes free delivery and installation, so you won’t have to worry about extra installation fees. However, having a window is not the only prerequisite for a window-mounted one. You need to have a sturdy window and be big enough so that the whole unit can fit within its boundaries and make sure that it won’t give out under the unit’s weight.

Unlike PACs that you can situate wherever on the floor, you have to measure the window before installation. This will give you a gauge on which model can fit within the boundaries of your window. One downside of having a window option is that it makes your window inaccessible or unusable. The unit may block the path of light, and the sealing around the unit may prevent you from being able to open/close your window. So, suppose you value having a window that you can freely open or indoor plants that need some sunlight. In that case, I suggest that you opt for window ones only if you have a couple of windows available.

It is one whole unit that is relatively lightweight and moderately sized (depending on the model), an appropriate size that a window frame can support. On the other hand, through-the-wall ACs are usually heavier because concrete walls can support more weight than windows. In terms of sturdiness and cooling power, most window models are sturdier and more powerful than PACs. Window options are also more advanced features than PACs because being portable sometimes limits PACs.

The outer body of a window model typically hangs out from the window, so other people add extra metal encasement outside for extra sturdiness or to ensure that the unit won’t get stolen from outside. Suppose you’re a handyman who’s looking for some tools that you can use in making this metal support/encasement. In that case, you should check out the following: engine-driven welders, extension cords, plasma cutters, mini metal lathe machines, welding glasses/goggles, and welding gas.

Through the wall

You can’t cut a hole through the wall to make space for it if you’re renting a space—getting your security deposit back will be a challenge. So, if you have your own space, where you can make permanent changes without getting in trouble for it, this type is the perfect choice for you.

Like window-mounted ones, through-the-wall ones consist of one big unit that doesn’t need extra parts/systems for ventilation or drainage like PACs do. As the name suggests, the whole unit is installed through a rectangular hole in your wall, with its vent facing outside and the fans facing inwards, blowing cold air inside. In terms of cooling power, depending on the brand, both window, and through-the-wall models have a wide BTU range and can effectively cool small or large single rooms.

However, these two types differ in the specific placement of their ventilation system: window ones have vents at the sides. In contrast, through-the-wall alternatives only have vents at the very back of the unit. This is why the former hangs out from the window, so its side vents can expel air properly. At the same time, the latter can fit snugly through the wall, lined up flushed with the exterior wall with no hanging parts peeking out. So, if you detest the appearance of it hanging out from windows, I suggest that you go for a through-the-wall solution instead.

Home appliances like refrigerators can consume quite a lot of power, especially if the unit you have is not energy-saving. Considering the other high-wattage appliances in your home, you should be careful about choosing the right extension cord, circuit breaker, or electrical fuse. These things vary in the amount of voltage they can handle; the amount of electrical current they can carry depends on their wire sizes/lengths. One honest mistake can lead to appliance failure, short-circuiting, or worse, accidental fires.

To help you with this, you can read these guides before buying an extension cord or a circuit breaker: Amp Wires, Breakers & Circuits Chart (20-60 Amp Extension Cord) and Amp Wire Size Guide & Chart (70-600 Amp).

What to look for

After deciding what type you’re going to get, you should look for the following features as you decide what brand or model will best address your needs.

  • Quietness
    • For a peaceful sleep and workspace, buy one with a 50-60 dB range. A decibel range of 60-80 dB can also work, since most of them only become noisy when running at their fullest capacity.
  • Air quality
    • One equipped with a good filtering performance and is equipped with a high-quality filter is the best choice for people who suffer from allergies or are sensitive to dust like elders and babies. Look for a unit that can dehumidify the air effectively and has a HEPA or antimicrobial filter that you can easily clean and/or replace
  • Energy efficiency
    • If you want to make sure that you’re getting one unit that’s cost-efficient, look for a unit that is Energy Star Qualified. This means that it is energy-efficient; the higher the star rating, the more energy-efficient it is. You’ll save a lot of money on your electrical bills if you have a highly-efficient unit.
  • Warranty
    • To save money and effort, find a brand that offers a long warranty and free returns to save yourself from costly repairs and the hassle of going out of your way to find an electrician that can repair your AC.
New AC unit being installed

Room size of a 15,000 & 18,000 BTU unit & how much it powers

Larger spaces contain a lot of hot, humid air than small spaces. To cool down this area, it must use a certain amount of energy to convert the existing hot air into cool, dehumidified air. This process entails condensing and evaporating moisture from the air, where BTU comes in.

  • British Thermal Units (BTU) is an international measure of energy. It describes the amount of energy that’s needed to increase the temperature of 1 lb of water by 1°F.
  • 1 BTU = energy required to increase the temperature of 1 lb of water to 1°F
  • Rule of thumb: 1 sq. ft. = 20 BTU/hr

They work by taking in hot air from the room, condensing it into liquid, and then evaporating the heat out of it, which is released outside through the vent/s. The cooled-down liquid is left in the unit, processed again to become cool air. Larger spaces would contain higher amounts of hot/warm air that needs cooling, which is why you’d need an AC with higher BTU for larger rooms. Thus, the BTU/hr determines its cooling capacity.

However, “ higher” doesn’t always equate to “better.” You need to choose the right one with the right power level for your space. It’s a common misunderstanding that a powerful AC one can work anywhere as long as it can cool down your space—this is not true. Suppose you buy a 16,000 BTU option for a mere 250 sq. ft. room. In that case, you’ll only be wasting energy and hiking up your electricity bills because it will just undergo each cycle too quickly.

A 15,000 – 18,000 BTU option would be the perfect choice for a room with a size of 700-1000 sq. ft. area, such as large bedrooms, living rooms, offices, and other commercial spaces.

However, these factors can also affect the level of power that you will need:

  • room’s amount of / exposure to sunlight
  • increase BTU if sunny
  • decrease BTU if shaded
  • crowded area”
  • increase BTU if crowded (each person generates body heat)
  • appliance load or type
    • use kitchen oven and/or stove would require an increase in BTU

To estimate the amount of BTU that you need to adjust, consult with the provider of your unit before purchasing.


The market is saturated with brands that offer quality home and commercial appliances. This makes shopping hard sometimes because you have many options to choose from. To help you in narrowing down your search, here are some examples of the unique brands that have 15,000-18,000 BTU air units:

LG Electronics

LG is a well-known brand of smart devices and home appliances, garnering high spots on various top brands in different categories. They have been bringing quality products to the market ever since 1958, always sticking to their goal of improving their customers’ life quality. Indeed, their brand image, “Life’s Good,” fits them very well.

Having decades of experience in designing, manufacturing, and marketing smart appliances, LG Electronics knows how to innovate towards the betterment of the environment. LG’s products are smart, energy-efficient, and eco-friendly. Their ACs are Energy Star qualified, saving up to 70% of energy consumption. Each unit has amazing cooling power, filtering performance, and low-noise operation, equipped with LG’s rapid cooling technology, HEPA filters, and other smart features that other brands have not perfected yet. For ease of usage and maintenance, many of their products have WiFi control features and filter indicators.

LG Electronics offers various options, such as portable, window-mounted, through-the-wall, split-type, and central air conditioning units. Here are some in the 15,000-18,000 BTU range that caught our attention:

  • LG LW1516ER – 15,000 BTU
  • Cooling area of up to 800 sq. ft.
  • Indoor noise: 57-61 dB
  • 3 cooling & fan speeds
  • 4-way air direction
  • Slide-out washable filter
  • Remote control & 24-hr timer
  • LG LW1816ER – 18,000 BTU
    • Cooling area of up to 1000 sq. ft.
    • Indoor noise: 61-65 dB
    • 3 cooling & fan speeds
    • 4-way air direction
    • Slide-out washable filter
    • Remote control & 24-hr timer
  • LG LW1815HR – 18,000 BTU
    • 2-in-1: Seasonal Heating & Cooling
    • Cooling area of up to 1000 sq. ft.
    • 2 cooling & heating fan speeds
    • Remote control


AC filter being replaced

According to Euromonitor International Limited, Haier has been reigning as one of the top brands in major appliances for 12 consecutive years—an amazing feat during their 30 years of operation in the industry. They bring high-quality, reliable products to the market, such as Haier’s products, which are smart, energy-efficient, and user-friendly. Like LG, Haier products are Energy Star qualified, helping users save up to 63% of energy usage. What’s also amazing about some of their products is that they’re equipped with self-cleaning filters, which is a wonderful feature to have because it makes maintenance much easier.


Without a doubt, Frigidaire is always at the top of the list of many shoppers when they’re looking for cooling appliances. Frigidaire, since 1918, has been true to its brand name and focuses on making premium cooling appliances for its customers. However, as they developed, the company also ventured towards other home appliances; they now have various products such as refrigerators, freezers, dishwashers, ovens, and air conditioners, among many others. Frigidaire is trusted by many because of their units’ proven and tested impressive features.

Frigidaire ones have an impressive cooling capacity and numerous smart & energy-saving features. Like the brands above, Frigidaire products are also Energy Star certified and have features that make its operation much easier (clean filter alert, washable antibacterial filter, remote temperature control, etc.).

GE Appliances

GE Appliances, a brand under Haier, offers a lot of eco-friendly, smart, and user-friendly home appliances. They have room air conditioners (through-the-wall/built-in, window, and portable ones), kitchen appliances, water filters, refrigerators, heaters, and many more. Many of their products are also Energy Star certified and equipped with antibacterial filters. Furthermore, they have a new line of SMART GE ROOM ACs, enabling users to create their cooling schedule and check the unit’s energy usage! You can easily control it through your smartphone and get reminders to clean it.

After only a few years of operation, GE has already become a favorite of most people due to its low energy consumption, innovative smart features, and amazing filtering performance.


After a century of manufacturing home appliances, Kenmore has nearly perfected the production of energy-efficient products with only the highest quality. As proof of their hard work and great innovations, Kenmore has been awarded the Energy Star Award multiple years in a row.

Kenmore’s models have the low-power startup feature, enabling each unit to yield powerful results despite using the lowest energy possible. So, if you have a large room that needs rapid cooling and you want to save up on your electricity bill, Kenmore should be on your priority list. This brand offers central, wall-mounted, window-mounted, and portable ones with a wide BTU range of antimicrobial filters and smart technology.

Arctic King

If high-quality, budget-friendly appliances are what you’re searching for, Arctic King can give you what you need! You can take your pick among their portable, window-mounted, and through-the-wall ones, which are all reasonably priced and boast amazing features and good cooling capacities. It’s amazing how even their smart models are significantly more affordable than other brands, allowing users the luxury of having a smart unit without splurging. Also, these are proven to be durable and long-lasting!


Daewoo Electronics is a company that always focuses on sustainable growth. Since their establishment 30 years ago, Daewoo has continuously innovated to offer only eco-friendly & energy-saving robust products to their customers. As a result of their innovations, Daewoo has made two energy classes for their units: A Cooling and A++ Cooling. This feature allows the users to control the cooling power and energy consumption. Also, their units are equipped with the Turbo Heating-Cooling Technology, allowing it to rapidly cool or heat the room within minutes. Daewoo ones are also quiet despite the powerful cooling features. Some advanced models have smart features for easier control and maintenance.

Homelabs (hOmeLabs)

If you’re looking for one that can beat the hot, humid air in your area, hOmeLabs should be on your list. These are well-known for having impressive dehumidifying features, rivaling those of other reputed brands. Homelabs also take pride in how energy-saving and efficient their models are. You can take a pick from their portable and window-mounted ones, which are all user-friendly and ergonomically designed.

Be sure also to read our article on gasless MIG welding, showers vs. baths & adding a shower.

Leave a Comment

Your email address will not be published. Required fields are marked *