Kenmore KM8K-R 8,000 BTU Window Air Conditioner vs Manastin 12,000 BTU U Shaped Window Air
Updated July 2026 — Kenmore KM8K-R 8,000 BTU Window Air Conditioner wins on fan speeds and modes, Manastin 12,000 BTU U Shaped Window Air wins on cooling btu and room size.
The Kenmore KM8K-R is a more affordable option for smaller rooms, while the Manastin 12 offers superior cooling for larger spaces. Choose based on your specific needs.
Why Kenmore KM8K-R 8,000 BTU Window Air Conditioner is better
Price
Kenmore is $180 cheaper.
Weight
Kenmore is lighter at 44.8 lbs.
Noise
Kenmore emphasizes quiet operation.
Why Manastin 12,000 BTU U Shaped Window Air is better
Cooling Power
Manastin cools up to 550 sq. ft.
Design
Manastin's U-shaped design allows window opening.
Features
Manastin has 'My Temp' remote functionality.
Overall score
Specifications
| Spec | Kenmore KM8K-R 8,000 BTU Window Air Conditioner | Manastin 12,000 BTU U Shaped Window Air |
|---|---|---|
| Price | $248.99 | $429.98 |
| Installation | Easy | U-shaped |
| Remote Control | Yes | Yes |
| Energy Saver | Yes | Yes |
| Filter Type | Washable | Washable |
Dimension comparison
Overview of the Kenmore KM8K-R and Manastin 12
The Kenmore KM8K-R is priced at $248.99, making it about 42% cheaper than the Manastin 12, which costs $429.98. While both air conditioners are designed for effective cooling, they cater to different room sizes and offer distinct features that may influence your buying decision.
Cooling Power and Room Size
The Kenmore KM8K-R provides 8,000 BTUs of cooling power, effectively cooling medium rooms up to 350 sq. ft. In contrast, the Manastin 12 boasts a more robust 12,000 BTU capability, suitable for larger spaces of up to 550 sq. ft. This significant difference in cooling capacity means that the Manastin 12 is better equipped for more expansive areas, while the Kenmore KM8K-R is ideal for smaller rooms like bedrooms or home offices.
Design and Installation
The Kenmore KM8K-R features a traditional window-mounted design, which allows for easy installation into most standard windows. It weighs 44.8 lbs, making it manageable for single-person setup. The Manastin 12, however, utilizes a unique U-shaped design that enables the window to slide into the unit’s groove. This design not only facilitates easy installation but also allows for open-window flexibility, providing fresh air without needing to uninstall the AC.
Energy Efficiency
The Kenmore KM8K-R has a CEER rating of 10.9, indicating strong cooling performance while reducing energy consumption. This model is designed to keep utility costs low. The Manastin 12 also prioritizes energy savings with its Energy Saver Mode, which cycles the fan and compressor to limit energy use. Thus, both units offer energy-efficient features, but the Kenmore's lower price point might yield better cost savings over time.
Operating Features
Both air conditioners come with user-friendly features, but there are distinctions in their functionalities. The Kenmore KM8K-R offers multiple operating modes, including Sleep, Auto, Eco, and Cooling modes, along with three fan speeds. It also includes a remote control for easy adjustments. On the other hand, the Manastin 12 introduces the innovative "My Temp" feature that transforms the remote into a portable thermostat, allowing it to adjust cooling based on your location within the room. This personalization can significantly enhance comfort in larger spaces.
Maintenance and Cleaning
Maintenance is straightforward for both units. The Kenmore KM8K-R is equipped with a washable filter that improves air quality and reduces maintenance costs. Its auto-restart feature ensures that settings are preserved during power outages. The Manastin 12 also includes a washable filter along with a Filter Reset indicator that reminds you to clean the filter every 250 hours. This thoughtful feature can prolong the unit's lifespan and ensure optimal performance.
Noise Levels
While specific noise levels are not disclosed for either air conditioner, the Kenmore KM8K-R emphasizes quiet operation, making it suitable for bedrooms and other quiet spaces. The Manastin 12, with its U-shaped design, places the noisy compressor outside, which may help reduce indoor noise levels while still delivering effective cooling. Therefore, if noise is a primary concern, the Kenmore might be the better choice, especially in a bedroom setting.
Which should you buy?
Choosing between the Kenmore KM8K-R and the Manastin 12 ultimately depends on your cooling needs and space requirements. If you are looking for a budget-friendly option that efficiently cools medium-sized rooms, the Kenmore KM8K-R is a strong contender at $248.99. However, if you require a higher cooling capacity for larger areas and appreciate features like the U-shaped design and "My Temp" functionality, the Manastin 12 is worth the investment at $429.98. Consider your specific needs, space size, and budget when making your decision.

