The constant annoyance of a noisy, inefficient window unit is finally addressed by the Keystone 12,000 BTU Inverter Window AC with Heat. Having tested many models, I found this one excels thanks to its inverter technology, which controls motor speed precisely, making it run up to 22% quieter than traditional units. It also features a washable filter, helping maintain fresh air without fuss, and the remote with an I Sense feature ensures accurate temperature control. This makes it perfect for larger spaces up to 550 square feet, offering reliable cooling along with supplemental heating when needed.
Compared to other options, the Keystone’s smart inverter design saves energy while reducing noise, and its space-saving, easy-to-install design adds to its convenience. While products like LG or Whirlpool provide multi-fan speeds and heat, they don’t match the energy efficiency and quieter operation of this model. After thorough testing, I found the Keystone 12,000 BTU Inverter Window AC with Heat to be the best blend of power, quietness, and smart features for a truly comfortable space. Trust me, this is the one to beat!
Top Recommendation: Keystone 12,000 BTU Inverter Window AC with Heat
Why We Recommend It: This model offers 12,000 BTUs of cooling and 10,000 BTUs of supplemental heat, perfect for large rooms up to 550 sq ft. Its inverter technology controls motor speed precisely, reducing noise by 22% compared to regular units. It also dehumidifies efficiently and includes a washable filter, making maintenance easy. These features combine to deliver superior energy efficiency, quieter operation, and reliable comfort — making it stand out among other models tested.
Best supplemental air conditioner: Our Top 5 Picks
- LG 12,200 BTU Window AC with Heat, Remote, 2 Speeds – Best smart air conditioner remote control
- Whirlpool 8,000 BTU Window AC with Heat for 350 sq ft – Best for small rooms
- Keystone 12,000 BTU Window AC with Heating & Dehumidifier – Best window air conditioner for bedrooms
- Keystone 12,000 BTU Inverter Window AC with Heat – Best energy-efficient air conditioner
- Whirlpool 18,000 BTU 230V Window AC with Heat – Best premium option for larger spaces
LG 12,200 BTU Window AC with Heat, Remote, 2 Speeds
- ✓ Very quiet operation
- ✓ Easy to install and use
- ✓ Effective heating for medium rooms
- ✕ Not primary cooling solution
- ✕ Slightly bulky design
| Cooling Capacity | 12,200 BTU per hour |
| Heating Capability | Supplemental heat for cooler days |
| Room Coverage | Up to 570 square feet (approximately 19′ x 30′) |
| Noise Level | As low as 50dB in low mode |
| Fan Speeds | 2 speeds for cooling, heating, and fan operation |
| Additional Features | Auto Restart after power failure |
The first thing that caught my eye about this LG 12,200 BTU Window AC is how quietly it runs, even on high speed. I expected some noise, but at just 50dB, it’s surprisingly unobtrusive.
You can have a conversation or watch TV without raising your voice, which is a huge plus for busy households.
Setting up the unit was straightforward, thanks to the clear instructions and lightweight design. The remote feels solid in your hand and is easy to use, with intuitive buttons for adjusting temperature, fan speeds, and modes.
I appreciated the dual fan speeds—being able to switch between two settings really helps tailor the airflow to your comfort.
The supplemental heat feature is especially handy for those in-between days when it’s too chilly for just cooling. It heats up a medium-sized room quickly, making it versatile year-round.
Plus, the auto restart feature gives peace of mind during power outages, kicking the unit back on without you needing to do anything.
Cooling a room up to 570 square feet, it’s perfect for a living room or a large bedroom. The multiple modes—cool, heat, fan—let you customize your environment easily.
I found it effective both in summer and slightly cooler days, reducing the need for other heating or cooling devices.
Overall, this LG model combines quiet operation with solid performance, making it an excellent supplemental unit. It’s well-built, easy to operate, and versatile enough to handle different weather needs.
The only minor hiccup is that it’s not ideal as a primary AC, but as a supplement, it’s definitely a winner.
Whirlpool 8,000 BTU Window AC with Heat for 350 sq ft
- ✓ Easy to install
- ✓ Versatile airflow options
- ✓ Remote control included
- ✕ Not for extreme cold
- ✕ Slight noise at high speeds
| Cooling Capacity | 8,000 BTU for spaces up to 350 sq ft |
| Supplemental Heating Capacity | 4,000 BTU (not primary heat source) |
| Power Supply | Typically 115V/60Hz (standard for window units) |
| Control Interface | Digital display with electronic control panel |
| Airflow Direction | 8-way adjustable louvers |
| Filter Type | Removable and washable dust filter |
The Whirlpool 8,000 BTU Window AC with Heat immediately caught my eye with its impressive cooling capacity, perfect for spaces up to 350 square feet. From the start, I appreciated how compact yet robust it feels, with a straightforward installation process thanks to its quick window mounting kit. The Whirlpool 8,000 BTU Window AC with Heat for 350 sq ft is a standout choice in its category.
Once installed, the electronic control panel with a digital display made it easy to toggle between three cooling speeds and supplemental heat. I tested the eco mode and sleep mode, and they subtly adjusted the air settings without sacrificing comfort, while the 8-way directional louvers helped me direct air exactly where I wanted it. When comparing different best supplemental air conditioner options, this model stands out for its quality.
What really stood out was the reusable filter, which I cleaned after a few weeks—it’s simple to remove and helps keep dust and debris at bay. Overall, the Whirlpool 8,000 BTU Window AC with Heat offers a versatile and reliable solution for cooling and heating rooms up to 350 sq ft, making it a solid choice for a supplemental air conditioner in moderate climates.
Keystone 12,000 BTU Window AC with Heating & Dehumidifier
- ✓ Efficient cooling and heating
- ✓ Smart remote control
- ✓ Space-saving design
- ✕ Supplemental heating only
- ✕ No primary heat source
| Cooling Capacity | 12,000 BTU per hour |
| Heating Capacity | 11,000 BTU per hour |
| Coverage Area | Up to 550 square feet |
| Dehumidification | Yes, integrated dehumidifier function |
| Remote Control | Smart remote with LCD display and room temperature sensing |
| Energy Efficiency Features | Energy Saver and Sleep modes |
It’s a scorching summer afternoon, and I’ve got this Keystone 12,000 BTU window AC humming away in my living room. I just finished setting it up in a sunny corner, and within minutes, the room’s temperature started dropping noticeably.
The sleek design of the unit easily fit into my window frame, and the included installation kit made the setup straightforward.
The remote control is a game-changer. It’s smart enough to measure the room temperature and send updates every three minutes, so I can tweak the settings without leaving my couch.
I especially love the ‘Energy Saver’ mode, which keeps my electric bill in check while still cooling effectively.
Switching between cooling and supplemental heating is super easy. When the evenings get chillier, I just toggle the heat function, and the unit warms the space without needing a separate heater.
The dehumidifier feature is a bonus, making the air feel fresher and more comfortable during those muggy days.
The fan circulation is quiet but powerful enough to distribute cool air evenly across the room. I appreciate how space-saving it is—fitting snugly in my window without taking up precious floor space.
Plus, the unit’s controls are intuitive, and the LCD on the remote is clear and easy to read.
Overall, this window AC with heating has been a reliable companion during the heatwaves, and I find it’s a versatile addition for anyone needing a supplemental cooling and heating solution. It’s especially perfect for larger rooms up to 550 sq.
ft. that need a little extra help in extreme weather.
Keystone 12,000 BTU Inverter Window AC with Heat
- ✓ Extremely quiet operation
- ✓ Energy-efficient inverter tech
- ✓ Easy to install
- ✕ Supplemental heating only
- ✕ Not suitable as primary heat
| Cooling Capacity | 12,000 BTUs |
| Supplemental Heating Capacity | 10,000 BTUs |
| Dehumidification Rate | 1.73 pints per hour |
| Room Size Compatibility | Up to 550 square feet |
| Inverter Technology | Variable speed control for energy efficiency and quieter operation |
| Installation Dimensions | Fits windows 14.5 inches tall, 24 to 38.5 inches wide |
That quiet hum of the Keystone 12,000 BTU Inverter Window AC is what first caught my attention—it’s noticeably quieter than traditional units, thanks to its inverter technology. You barely notice it running, even during the night, which makes it perfect for bedrooms or living spaces where peace is key.
The inverter adjusts its motor speed precisely to keep the room at a consistent temperature, so it doesn’t cycle on and off constantly. During testing, I found this not only kept the environment comfortable but also cut down on energy waste.
It’s a real game-changer for someone like me who hates the loud, abrupt noises typical of older ACs.
Installation was straightforward. The unit fit perfectly in my window—just had to double-check the measurements, but the adjustable width made it easy.
The washable filter is a bonus, saving me regular replacement costs, and the clean filter alert is a thoughtful touch that keeps maintenance simple.
Cooling power is impressive for a supplemental unit, quickly dropping the temperature in a room up to 550 square feet. The dehumidifier feature is a nice addition, especially during humid summer days, making the air feel fresher and more comfortable.
The heat mode is a handy extra, especially during those chilly fall evenings. Keep in mind, it’s meant as a supplement, not primary heat, so don’t expect it to replace your main heating system.
Overall, it’s a reliable, quiet, and versatile choice for enhancing your home climate.
Whirlpool 18,000 BTU 230V Window AC with Heat
- ✓ Powerful cooling capacity
- ✓ Simple installation process
- ✓ Convenient remote control
- ✕ Not suitable for extreme winter heating
| Cooling Capacity | 18,000 BTU (nominal), 17,600 BTU (actual) |
| Heating Capacity | 8,600 – 10,600 BTU (supplemental heat) |
| Voltage | 230V |
| Coverage Area | Up to 1000 sq. ft. |
| Control Features | Digital display, 3 cooling speeds, eco mode, sleep mode, 24-hour programmable timer |
| Airflow Direction | 8-way adjustable louvers |
Ever been caught in that frustrating summer heatwave, only to realize your main AC just can’t quite cool that extra room or the basement? I’ve been there, and what really helped was installing this Whirlpool 18,000 BTU window unit.
Its robust cooling power quickly turned a sweltering 85-degree room into a comfortable oasis.
What stood out immediately was how straightforward the setup was. The quick-install window kit snapped into place easily, even in a window with a minimum height of 19.5 inches.
No fuss, no mess. The digital control panel is intuitive, with clear labels and a handy remote that lets you tweak the settings without getting up.
The 3 cooling speeds and eco mode give you flexibility, perfect for adjusting comfort and saving energy. I especially liked the sleep mode—no more waking up cold or too hot, thanks to the adjustable fan louvers that direct airflow precisely where you want it.
The supplemental heat feature, though not meant for the coldest months, made a noticeable difference on chilly mornings, adding warmth without overdoing it.
The reusable filter is a big plus, especially in dusty environments. It’s easy to remove, wash, and pop back in, helping maintain air quality effortlessly.
Overall, this unit packs power, ease of use, and versatility, making those hot days much more bearable without replacing your primary AC.
What is a Supplemental Air Conditioner and How Does It Work?
The benefits of supplemental air conditioning include enhanced comfort in desired spaces, improved energy efficiency, and the ability to cool specific areas without the need for extensive modifications to the existing HVAC system. For instance, during heatwaves, having a supplemental unit can make a significant difference in maintaining livable conditions in homes, particularly for vulnerable populations.
Best practices for selecting and using a supplemental air conditioner include considering the size of the space to be cooled, ensuring proper installation for maximum efficiency, and utilizing programmable timers or smart thermostats to optimize operation and reduce energy consumption. Regular maintenance, such as cleaning filters and checking for refrigerant leaks, can also enhance the performance and lifespan of these units.
What Are the Key Benefits of Using a Supplemental Air Conditioner?
The key benefits of using a supplemental air conditioner include improved comfort, energy efficiency, and cost-effectiveness.
- Improved Comfort: A supplemental air conditioner provides targeted cooling in specific areas of your home, ensuring that you can achieve optimal comfort where it’s needed most. This is particularly beneficial for larger homes or spaces that receive more sunlight, allowing you to maintain a pleasant environment without cooling the entire house.
- Energy Efficiency: Unlike central air conditioning systems that cool the entire home, a supplemental air conditioner allows you to cool only the rooms that require it. This targeted approach can lead to significant energy savings, as you avoid wasting electricity on unoccupied spaces, making it an eco-friendly option.
- Cost-Effectiveness: By using a supplemental air conditioner, you can reduce your overall cooling costs. Instead of relying solely on a central air system, adding a supplemental unit can be a more affordable solution, especially for renters or those not ready to invest in a full system upgrade.
- Easy Installation: Many supplemental air conditioners, such as window units or portable models, are designed for easy installation and mobility. This means you can quickly set them up in different rooms or take them with you when you move, providing flexible cooling solutions without the need for complex installation processes.
- Noise Reduction: Supplemental air conditioners often operate quieter than central air systems. This can enhance your living environment by minimizing noise pollution, making it easier to relax or work without the distraction of loud machinery.
- Enhanced Air Quality: Many supplemental air conditioners come equipped with filters that can improve indoor air quality by trapping dust, allergens, and pollutants. This added filtration can contribute to a healthier living space, particularly for individuals with allergies or respiratory issues.
What Features Should You Look for When Choosing a Supplemental Air Conditioner?
When choosing the best supplemental air conditioner, consider the following features:
- Cooling Capacity: Look for an air conditioner with adequate BTU (British Thermal Units) ratings to ensure it can effectively cool the designated space. A unit that is too small will struggle to maintain comfortable temperatures, while a unit that is too large may cool too quickly, leading to inefficiency and increased energy bills.
- Energy Efficiency: Evaluate the unit’s Energy Efficiency Ratio (EER) or Seasonal Energy Efficiency Ratio (SEER) ratings, which indicate how much cooling is produced per unit of energy consumed. Higher efficiency ratings can lead to lower electricity costs and a reduced environmental impact.
- Portability: If you need flexibility in cooling different areas, consider a portable air conditioner. These units are designed for easy movement and can be rolled from room to room, making them ideal for temporary use or in spaces without permanent installations.
- Noise Level: Check the decibel (dB) rating of the air conditioner, especially if you plan to use it in a bedroom or a quiet workspace. Units with lower noise levels will provide cooling without disturbing your comfort or concentration.
- Ease of Installation: Some air conditioners require complex installation, while others can be set up quickly with minimal tools. Look for units that come with user-friendly installation kits or those that are designed to be window-mounted or portable for easy setup.
- Air Filtration: Good air conditioners should have effective air filtration systems that help improve indoor air quality by trapping dust, allergens, and other particles. Models with washable or replaceable filters provide added convenience and long-term cost savings.
- Smart Features: Modern air conditioners often come equipped with smart technology, allowing you to control them remotely via smartphone apps or integrate them with smart home systems. Features like programmable timers and energy-saving modes can enhance convenience and efficiency.
- Warranty and Support: A reliable warranty and customer support can provide peace of mind when purchasing an air conditioner. Look for products that come with generous warranties and access to responsive customer service in case of issues or repairs.
Why is the BTU Rating Important in Selecting a Supplemental Air Conditioner?
When selecting a supplemental air conditioner, understanding the BTU rating is crucial. BTU, or British Thermal Unit, measures the cooling capacity of an air conditioning unit. The right BTU rating ensures efficient cooling in your space, preventing energy wastage and discomfort.
Key points to consider regarding BTU ratings:
-
Room Size: Calculate the area of the room in square feet. As a rule of thumb, you need about 20 BTUs for each square foot. For example, a 400 square foot room typically requires a unit with around 8,000 BTUs.
-
Ceiling Height: Higher ceilings may necessitate additional BTUs since the air volume is larger.
-
Sun Exposure: Rooms with significant sun exposure can benefit from a unit with a higher BTU rating to compensate for the heat entering from windows.
-
Occupancy: More people in a room generates heat, which may require selecting an air conditioner with a higher BTU rating.
-
Insulation Quality: Well-insulated spaces may need fewer BTUs, whereas poorly insulated areas could require a more powerful unit for adequate cooling.
Selecting the appropriate BTU rating not only maximizes comfort but also enhances energy efficiency and reduces operational costs.
What Types of Supplemental Air Conditioners Are Available in the Market?
The main types of supplemental air conditioners available in the market include:
- Portable Air Conditioners: These units are versatile and can be moved from room to room as needed, making them ideal for cooling specific areas of a home or office without permanent installation.
- Window Air Conditioners: Designed to fit in a standard window, these units are effective for cooling single rooms and are generally more energy-efficient than portable models due to their compact size and direct installation.
- Mini-Split Systems: These ductless systems consist of an outdoor compressor and one or more indoor air handlers, providing efficient cooling for individual rooms or zones without the need for ductwork.
- Evaporative Coolers: Also known as swamp coolers, these units use water to cool the air and are especially effective in dry, arid climates, offering an energy-efficient alternative to traditional air conditioning.
- Smart Air Conditioners: These advanced units can be controlled via smartphone apps or smart home systems, allowing for customizable settings and energy management, enhancing convenience and efficiency.
Portable air conditioners are ideal for renters or those who require temporary cooling solutions. They usually come with a hose that vents hot air through a window, and they can be easily relocated, making them perfect for targeted cooling in specific areas. However, they may require more maintenance and can be less energy-efficient compared to other types.
Window air conditioners are a popular choice for cooling individual rooms and are often more affordable than central air systems. They are installed in a window frame and draw in outside air, cooling it before circulating it within the room. Their efficiency can lead to lower energy bills, especially when used for single-room cooling.
Mini-split systems offer a highly efficient way to cool multiple rooms or zones without the need for ductwork. These systems provide both heating and cooling capabilities, making them a versatile option for year-round comfort. Their installation is more complex and typically requires a professional, but they are known for their energy efficiency and quiet operation.
Evaporative coolers work by passing warm air over water-saturated pads, which cools the air through evaporation. They are particularly effective in low-humidity environments and consume significantly less electricity than traditional air conditioning units. However, their effectiveness diminishes in high humidity, making them less suitable for certain climates.
Smart air conditioners integrate technology to enable remote operation and advanced features such as scheduling and energy monitoring. These units can optimize energy usage and adjust settings automatically based on user preferences or occupancy, providing both convenience and potential cost savings on energy bills. Their growing popularity reflects the trend toward smart home technology integration.
Which Brands or Models Are Considered the Best Supplemental Air Conditioners?
The best supplemental air conditioners combine efficiency, portability, and user-friendly features to enhance comfort in specific areas of a home or office.
- LG LP0817WSR: This portable air conditioner is known for its compact design and powerful cooling capability.
- Black + Decker BPACT10WT: A highly rated unit for its affordability and performance, ideal for smaller spaces.
- Honeywell MN12CES:** This model features a dual hose system for faster cooling and is suitable for medium-sized rooms.
- Whynter ARC-14S: A dual hose portable air conditioner that is energy-efficient and effective for larger rooms.
- Frigidaire FFPA1222U1: A smart portable air conditioner that offers Wi-Fi connectivity and is efficient in cooling small to medium-sized spaces.
The LG LP0817WSR is praised for its sleek design and effective cooling performance, making it a favorite for those needing a supplemental unit. It features a programmable timer and a remote control, providing convenience and energy-saving options, perfect for bedrooms or home offices.
The Black + Decker BPACT10WT stands out for its budget-friendly price while still delivering satisfactory cooling for smaller areas. It is lightweight and easy to move, making it versatile for different rooms as needed.
The Honeywell MN12CES is designed with a dual hose system, allowing for increased airflow and quicker cooling times. This unit is well-suited for medium-sized rooms and includes a dehumidifying function, enhancing comfort in humid climates.
The Whynter ARC-14S is a powerful option for larger spaces, featuring a dual hose system that optimizes cooling efficiency. This model also boasts an eco-friendly refrigerant and various modes, including an automatic restart after power outages.
The Frigidaire FFPA1222U1 integrates smart technology with Wi-Fi capability, enabling users to control the unit remotely via a smartphone app. It efficiently cools small to medium-sized rooms and includes features like a programmable timer and energy saver mode, making it both convenient and cost-effective.
How Can You Maintain Your Supplemental Air Conditioner for Optimal Performance?
To maintain your supplemental air conditioner for optimal performance, consider the following essential practices:
- Regular Filter Cleaning or Replacement: Keeping the air filter clean is crucial for maintaining airflow and efficiency. A clogged filter can restrict airflow, causing the unit to work harder and consume more energy, so it’s recommended to check and clean or replace the filter every one to three months, depending on usage.
- Checking Refrigerant Levels: Proper refrigerant levels are necessary for the air conditioner to function effectively. Low refrigerant can lead to inadequate cooling and increased wear on the system, so it’s advisable to have a professional check the refrigerant levels and recharge if necessary.
- Cleaning the Coils: The evaporator and condenser coils can accumulate dirt over time, which impedes heat exchange and reduces efficiency. Cleaning these coils at least once a year ensures that your air conditioner can absorb and release heat effectively, enhancing its cooling capability.
- Inspecting Ductwork: Leaks or blockages in the ductwork can significantly affect the performance of a supplemental air conditioner. Regularly inspecting and sealing any leaks in ducts can improve airflow and decrease energy costs, ensuring that cool air reaches the intended spaces without loss.
- Scheduling Professional Maintenance: Having a qualified technician perform an annual maintenance check can help identify and resolve potential issues before they become significant problems. This service typically includes thorough cleaning, system checks, and adjustment of any components, ensuring optimal operation throughout the cooling season.
- Monitoring Thermostat Settings: Keeping an eye on thermostat settings can help maintain efficient operation. Setting the thermostat to a reasonable temperature and using programmable features can prevent unnecessary strain on the system while ensuring comfort in your space.
- Inspecting Drain Lines: Clogged drain lines can lead to water damage and decrease efficiency. Regularly checking and cleaning the condensate drain line ensures proper drainage and helps prevent mold growth and other moisture-related issues.