Is the summer heat getting you down? Or maybe you’re looking for a versatile cooling and heating solution that won’t break the bank? If so, you’ve probably heard of Keystone. When it comes to reliable and efficient home comfort, a Keystone air conditioner is often a top contender, offering a range of units designed to tackle various spaces and needs.

Choosing the right air conditioner can feel like a big task, with so many BTUs, features, and types to consider. But don’t sweat it! We’ve done the legwork for you, diving deep into Keystone’s lineup to bring you our picks for the 7 best Keystone air conditioners on the market. Whether you need a compact window unit for a small bedroom or a powerful wall-mounted system for a larger living area, we’ve got you covered. Let’s find the perfect chill for your space!

---

Our Top Picks: The Best Keystone Air Conditioners Reviewed

Here’s a closer look at the units that stood out for their performance, features, and overall value.

1. Keystone 12,000 BTU Wall Mounted Air Conditioner with Supplemental Heat

This wall-mounted unit is a fantastic choice if you’re looking to maintain a comfortable temperature year-round without sacrificing window space. It’s perfect for those small to medium-sized rooms, up to 550 sq. ft., offering both powerful cooling and supplemental heating. Its sleek design integrates seamlessly into your room, making it a stylish yet practical home appliance.

• Key Features:

  • 12,000 BTU cooling / 10,600 BTU supplemental heating capacity.
  • Suitable for rooms up to 550 sq. ft.
  • Offers cooling, supplemental heating, dehumidification, and fan circulation.
  • Space-saving wall-mounted design with interior trim kit.
  • Smart remote control with ‘I Sense’ feature for accurate temperature sensing.
  • Energy Saver’ and ‘Sleep’ modes for reduced electricity consumption.
  • Requires a special 230-volt/20-amp electrical outlet.

• Pros:

  • Year-round comfort with both cooling and supplemental heat.
  • Keeps windows clear and floor space open.
  • Smart remote ensures precise temperature control wherever you are.
  • Energy-saving modes help reduce utility bills.

• Cons:

  • Supplemental heat isn’t a primary heat source.
  • Requires a specific 230-volt outlet, which might need professional installation.

• User Impressions: Customers frequently praise this unit for its strong cooling capabilities and the convenience of having supplemental heat. The smart remote is a big hit, providing accurate temperature readings. Installation difficulty due to the electrical requirement is sometimes mentioned, but overall satisfaction is high.

• See it on Amazon here

2. Keystone 14,000 BTU Wall Mounted Air Conditioner with Supplemental Heat

Need a bit more power for a larger living space? This 14,000 BTU wall-mounted unit from Keystone steps up to the plate, efficiently cooling and providing supplemental heat for areas up to 700 sq. ft. It shares many of the excellent features of its 12,000 BTU sibling but with an increased capacity, making it ideal for spacious rooms where year-round climate control is a must.

• Key Features:

  • 14,000 BTU cooling / 10,600 BTU supplemental heating capacity.
  • Efficiently cools and heats large spaces up to 700 sq. ft.
  • Multi-functional: cooling, supplemental heating, dehumidification, and fan.
  • Space-saving wall-mounted design.
  • Smart remote control with ‘I Sense’ technology.
  • ‘Energy Saver’ and ‘Sleep’ modes for energy efficiency.
  • Requires a special 230-volt/20-amp electrical outlet.

• Pros:

  • Powerful cooling and heating for larger rooms.
  • Maintains an unobstructed view and maximizes floor space.
  • Remote control intelligently maintains comfort.
  • Great for energy savings with smart modes.

• Cons:

  • Supplemental heat serves as a secondary source, not primary.
  • Requires a specific high-voltage electrical outlet.

• User Impressions: Reviewers love the robust cooling power of this unit, especially for larger open-plan areas. The quiet operation for its size and the convenience of the smart remote are frequently highlighted as major benefits. Users appreciate the all-in-one functionality, even with the electrical installation considerations.

• See it on Amazon here

3. Keystone 5,000 BTU Window Air Conditioner and Dehumidifier

For those smaller rooms where you just need to beat the heat, the Keystone 5,000 BTU window air conditioner is an absolute gem. It’s perfect for bedrooms, nurseries, or small offices up to 150 sq. ft., offering reliable cooling and impressive dehumidification. Plus, its quiet operation means you can enjoy a peaceful night’s sleep without disruptive noise.

• Key Features:

  • 5,000 BTU cooling capacity, ideal for rooms up to 150 sq. ft.
  • 3 cooling modes, 3 fan speeds, and 4-way adjustable air louvers.
  • Removes 1.3 pints of moisture per hour with built-in dehumidifier.
  • Quiet operation at 52dB, perfect for bedrooms.
  • Smart remote control with temperature sensing.
  • ‘Energy Saver’ and ‘Sleep’ modes.

• Pros:

  • Efficiently cools small spaces with low energy consumption.
  • Very quiet, ideal for sleeping or focused work.
  • Effective dehumidification adds to comfort.
  • Flexible control with multiple modes and adjustable louvers.

• Cons:

  • Only suitable for very small rooms.
  • Occupies a window space.

• User Impressions: This unit receives high marks for its effectiveness in small rooms and its remarkably quiet performance. Users often mention how quickly it cools down a bedroom and how much they appreciate the dehumidifier function. The smart remote is also a praised feature for convenience.

• See it on Amazon here

4. Keystone 12,000 BTU Window-Wall Air Conditioner with 11,000 BTU Supplemental Heat

This versatile Keystone air conditioner is designed for both window and through-the-wall installation, offering a flexible solution for larger spaces up to 550 sq. ft. It’s a true all-in-one unit, providing powerful cooling, supplemental heating, dehumidification, and fan circulation. If you’re looking for robust climate control with installation flexibility, this unit is hard to beat.

• Key Features:

  • 12,000 BTU cooling / 11,000 BTU supplemental heating capacity.
  • Designed for rooms up to 550 sq. ft.
  • Multi-functional: cooling, supplemental heating, dehumidification, fan.
  • ‘I Sense’ smart remote for accurate temperature monitoring.
  • ‘Energy Saver’ or ‘Sleep’ modes to optimize energy use.
  • Window installation kit included, also suitable for through-the-wall.

• Pros:

  • Powerful cooling and supplemental heat for larger rooms.
  • Versatile installation options (window or wall).
  • Smart remote ensures even comfort throughout the room.
  • Budget-friendly operation with energy-saving features.

• Cons:

  • Supplemental heating is not intended as a primary heat source.
  • Through-the-wall installation may require professional assistance.

• User Impressions: Users appreciate the dual installation options, making it a versatile choice. The heating capability, even if supplemental, is a bonus for many during cooler months. Its strong cooling power and the ‘I Sense’ remote are frequently highlighted as key advantages, providing consistent comfort.
• See it on Amazon here

5. Keystone 12,000 BTU Wall Mounted AC Unit and Dehumidifier

For those who want powerful cooling and serious dehumidification without blocking a window, this 12,000 BTU wall-mounted AC unit is a stellar option. It’s built to efficiently cool apartments, bedrooms, or any small to medium living space up to 550 sq. ft. With its significant moisture removal capabilities, it combats both heat and humidity for ultimate comfort.

• Key Features:

  • 12,000 BTU cooling capacity for spaces up to 550 sq. ft.
  • 3 cooling modes, 3 fan speeds, 4-way adjustable air louvers, programmable timer.
  • Removes 2.5 pints of moisture per hour.
  • Space-saving wall-mounted design with universal interior trim kit.
  • Smart remote control with temperature sensing.
  • ‘Energy Saver’ and ‘Sleep’ modes for cost-effective cooling.

• Pros:

  • Excellent cooling power combined with high dehumidification.
  • Maintains window views and preserves floor space.
  • Flexible air direction for targeted comfort.
  • Smart remote and energy modes enhance user experience and savings.

• Cons:

  • Installation requires a wall opening.
  • No heating function in this specific model.

• User Impressions: Customers love the strong cooling and impressive dehumidification of this wall unit, especially in humid climates. The ability to keep windows clear is a major selling point. Many find the smart remote and programmable timer convenient for setting personalized comfort schedules.
• See it on Amazon here

6. Keystone 6,000 BTU Window Mounted Air Conditioner & Dehumidifier

If you need a reliable and quiet cooling solution for a small-to-medium room, the Keystone 6,000 BTU window air conditioner is an excellent pick. Ideal for spaces up to 250 sq. ft., this unit is designed to keep your bedroom, nursery, or office comfortable without disturbing your peace. Its quiet operation and effective dehumidification make it a solid choice for focused work or a good night’s sleep.

• Key Features:

  • 6,000 BTU cooling capacity for rooms up to 250 sq. ft.
  • 3 cooling modes, 3 fan speeds, 4-way adjustable air louvers, programmable timer.
  • Removes 1.5 pints of moisture per hour.
  • Very quiet operation at 49dB.
  • Smart remote control with ‘I Sense’ temperature sensing.
  • ‘Energy Saver’ and ‘Sleep’ modes.

• Pros:

  • Perfect balance of cooling power and energy efficiency for smaller rooms.
  • Extremely quiet, making it suitable for noise-sensitive areas.
  • Effective dehumidification enhances overall comfort.
  • Smart features simplify control and maximize savings.

• Cons:

  • Only suitable for smaller room sizes.
  • Occupies window space.

• User Impressions: The quiet operation is consistently highlighted as a major advantage of this unit, with many users finding it perfect for bedrooms. Its efficiency in cooling and dehumidifying spaces up to 250 sq. ft. is also frequently praised, along with the convenience of the smart remote.
• See it on Amazon here

7. Keystone 10,000 BTU Slider Window Air Conditioner and Dehumidifier

Got slider or casement windows? Finding an AC unit that fits can be a real headache, but Keystone has you covered with this 10,000 BTU vertical air conditioner. Designed specifically for these window types, it efficiently cools rooms up to 450 sq. ft., making it a unique and powerful solution for spaces that traditional window units can’t handle.

• Key Features:

  • 10,000 BTU cooling capacity for rooms up to 450 sq. ft.
  • Specifically designed for standard sliding and casement windows.
  • 3 cooling modes, 3 fan speeds, 4-way adjustable air louvers, timer.
  • Removes 0.9 pints of moisture per hour.
  • ‘Energy Saver’ and ‘Sleep’ modes.
  • Removable chassis for window or through-the-wall installation.
  • Adjustable window kit included.

• Pros:

  • Unique design specifically fits slider and casement windows.
  • Strong cooling power for medium-sized rooms.
  • Flexible air direction for optimal comfort.
  • Energy-saving features help manage costs.

• Cons:

  • Lower dehumidification rate compared to some other models.
  • Installation measurements (window height/width) are specific.

• User Impressions: This unit is a lifesaver for those with non-standard windows, and users are thrilled with its ability to fit where others can’t. Its cooling power for its specialized design is highly rated, and the ease of use with the energy-saving modes is appreciated. The removable chassis for potential through-the-wall installation is also a notable benefit.

• See it on Amazon here

---

Conclusion

Picking the perfect Keystone air conditioner doesn’t have to be a daunting task. With a variety of models offering different BTUs, installation types, and features, there’s a Keystone unit out there that’s just right for your specific needs. Whether you prioritize quiet operation, year-round heating and cooling, or a special fit for unique windows, Keystone delivers reliable performance and energy-efficient comfort. We hope this guide helps you find your ideal climate control solution to stay cool, comfortable, and keep those energy bills in check!

---

FAQ Section

Q1: What makes Keystone air conditioners a good choice?
A1: Keystone air conditioners are known for their balance of performance, features, and affordability. They offer a wide range of products, from compact window units to powerful wall-mounted systems, often including multi-functional capabilities like dehumidification and supplemental heating. Many models also incorporate smart features like ‘I Sense’ remotes and energy-saving modes, making them both convenient and cost-effective.

Q2: How do I determine the right BTU for my room?
A2: BTU (British Thermal Unit) measures an AC’s cooling power. A general rule of thumb is:
* 150 sq. ft.: 5,000 – 6,000 BTU
* 250 sq. ft.: 6,000 – 8,000 BTU
* 350 sq. ft.: 8,000 – 10,000 BTU
* 450 sq. ft.: 10,000 – 12,000 BTU
* 550 sq. ft.: 12,000 – 14,000 BTU
* 700 sq. ft.: 14,000 – 18,000 BTU
Consider factors like ceiling height, direct sunlight exposure, and the number of people in the room; you might need a slightly higher BTU if these factors apply.

Q3: What’s the difference between a window AC and a wall-mounted (through-the-wall) AC?
A3: A window AC unit is designed to sit in a standard double-hung window opening, often with side panels to fill gaps. A wall-mounted or through-the-wall AC unit (often referred to as a PTAC or “packaged terminal air conditioner” if it also heats) requires a specific opening cut into an exterior wall. Wall-mounted units don’t block window views and can offer a more permanent, integrated look, but they typically require more involved installation.

Q4: What does “supplemental heating” mean for an AC unit?
A4: Supplemental heating means the unit provides additional heat to complement your primary heating system (like a furnace or heat pump), but it’s not designed to be the sole heat source for your home, especially in very cold climates. Keystone’s supplemental heating typically operates best within specific outdoor temperature ranges (e.g., 23 to 76 degrees Fahrenheit) and is great for taking the chill off a room during milder cool seasons.

Q5: How can I save energy with my Keystone air conditioner?
A5: Many Keystone AC units come with energy-saving features like “Energy Saver” and “Sleep” modes.
* Energy Saver Mode: The fan and compressor cycle on and off to maintain the set temperature, rather than running continuously.
* Sleep Mode: Gradually increases the temperature a few degrees over several hours, saving energy while you sleep comfortably, as your body naturally cools down at night.
Also, ensure your unit is properly sized for your room, keep filters clean, and seal any drafts around windows.

Q6: Are Keystone air conditioners noisy?
A6: Keystone offers models with varying noise levels. Generally, smaller window units like the 5,000-6,000 BTU models are designed for quiet operation (often around 49-52dB), making them ideal for bedrooms and nurseries. Larger units, whether window or wall-mounted, will naturally produce a bit more sound, but Keystone strives to keep noise levels reasonable across its product line for comfortable living.

Q7: How often should I clean my AC filter?
A7: It’s a good idea to clean your AC filter every two weeks during periods of heavy use, or at least once a month. A clean filter ensures maximum airflow and efficiency, helping your unit cool effectively and maintain indoor air quality. Most Keystone units have easily removable, washable filters for convenience.