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4.8 out of 5 stars. 4 reviews
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Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

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Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

Item # 6158180

Keystone Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU
Keystone Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU
$899.99
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  • New Arrival

  • Online Only

Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

Item # 6158180

Keystone Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU
Keystone Keystone Single Zone Summit 230V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

$899.99
or
or
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$50/mo.† suggested payments with 18 Months Financing or earn $44 in Rewards+ on this purchase.
Valid 9/21/2026 - 9/27/2026

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The Keystone Summit 9,000 BTU Mini Split AC and Heating System delivers efficient, year-round comfort for bedrooms, offices, additions, studios, and other spaces up to 400 sq. ft. This 230V Energy Star-certified ductless system includes indoor and outdoor units and requires professional installation to ensure proper setup, optimized performance, and reliable long-term use. With up to 23 SEER2 efficiency, advanced R454B refrigerant, and inverter-driven technology, it continuously adjusts output to maintain a more consistent indoor temperature while reducing energy consumption compared to many traditional systems.

Built for dependable operation in demanding climates, this mini split performs in outdoor temperatures ranging from 5°F to 131°F. The indoor unit operates as low as 30 dB on low fan, making it ideal for bedrooms, nurseries, and home offices where quieter operation matters.

Multiple comfort modes including Cool, Heat, Dry, Fan, Turbo, Sleep, and ECO allow for customized comfort throughout the day. Wi-Fi, app control, and smart home compatibility with smart home devices provide convenient remote access to temperature adjustments, scheduling, and energy-saving controls, while premium construction and an up to 7-year warranty support trusted Keystone performance.

  • Maximum Efficiency & Energy Savings: This Energy Star-certified Summit series delivers up to 23 SEER2 performance, with higher efficiency, more consistent temperature control, and lower energy consumption than many competing units.
  • Reliable Performance in Extreme Climates: Designed to maintain strong output in temperatures ranging from 5°F to 131°F, this 230V mini split AC ensures reliable, even heating and cooling for bedrooms, offices, and other spaces up to 400 sq. ft.
  • Advanced Noise Reduction for Quiet, Comfortable Living: Indoor units operate at 30 dB on low fan, making them quieter than a soft whisper. Perfect for bedrooms, nurseries, studies, or any space where noise control is essential.
  • Complete Mini Split System for Small Rooms: This 9,000 BTU system includes indoor and outdoor units for spaces up to 400 sq. ft.; professional installation is required for proper setup, optimized performance, and long-term reliability.
  • Cleaner Cooling: This advanced Summit series combines high efficiency with a more eco-conscious R454B refrigerant that reduces environmental impact and supports energy-efficient operation compared to many older refrigerant systems.
  • Total Comfort Control: Modes including Cool, Heat, Dry, Fan, Turbo, Sleep, and ECO allow for complete customization. The inverter system minimizes temperature swings for consistent, reliable comfort throughout the day.
  • App & Smart Home Control for Smart, Connected Comfort: Wi-Fi enabled and app-enabled, this ductless mini split supports smart home control, including compatibility with Alexa and Google Home for convenient voice and remote operation.
  • Premium Construction for Long-Term Durability: High-quality compressor engineering, optimized airflow design, robust outdoor construction, and an up to 7-year warranty help ensure reliable, year-round usage with minimal downtime.
  • Professional Installation Made Easier: Keystone customer service helps coordinate professional installation, saving you time and effort while helping ensure your system is properly set up for efficient, reliable performance.
  • *NOTE item is shipped in 2 separate boxes*

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Reviews

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Overall Rating

4.8

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Customer Images and Videos

1 to 4 of 4 Reviews .
1 – 4 of 4 Reviews
Review 1

Works really well

5 days ago
This has been working really well for keeping the room comfortable. The cooling is quick and consistent, and I like that I can also use it as a heat pump when the weather gets cooler. It runs pretty quietly and doesn’t take up much space.

Originally posted on Sampling program

Review 1

Amazing

14 days ago
I’m super pleased with this Mini Spilt. The installation was straightforward and the unit works very well. It cooled our guest room quickly and has been running smoothly so far.

Originally posted on Sampling program

Review 1

Mini split

15 days ago
Definitely took some time to install. It took a little to get the hang of and understanding of the mini split but when we did its really nice. It take a short period of time to cool the room. Its been warmer out and have yet to test the heater but looking forward to in the cooler months

Originally posted on Sampling program

Review 1

Great little unit that works great in big rooms

17 days ago
I’ve had this unit for about a week now, and so far I’ve been really happy with it. I installed it in our game room, which is around 300 square feet and for whatever reason never seemed to get quite enough air conditioning from the rest of the house. We wanted something that would actually make a noticeable difference in the room, and this definitely has. It’s been extremely hot lately, so we’ve been running the unit pretty much nonstop, and so far it has worked great with no issues whatsoever. The room gets significantly cooler, and it’s made the space much more comfortable. I originally planned on installing it myself because I’m pretty handy and was confident I could figure it out. In the end, due to a back injury I ended up having to call a handyman to install it. I did ask him about the unit though, and he had nothing but good things to say. He said the installation was very straightforward, everything was clearly laid out, and the unit comes with everything you need. He also said that if you’re someone who is pretty handy and comfortable with this type of project, you could probably handle the installation yourself. As far as the unit itself goes, it’s been quiet, cools the room quickly, and has made a very noticeable difference in a fairly large space. Obviously, I’ve only had it for about a week, so I can’t speak to long-term reliability yet, but my experience so far has been excellent. I would definitely recommend it if you need to add some serious cooling to a room that just doesn’t stay cool enough.

Originally posted on Sampling program