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5.0 out of 5 stars. 3 reviews
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Keystone Single Zone Summit 115V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

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Keystone Single Zone Summit 115V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

Item # 6158187

Keystone Keystone Single Zone Summit 115V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU
Keystone Keystone Single Zone Summit 115V 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 115V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU

Item # 6158187

Keystone Keystone Single Zone Summit 115V Ductless Mini Split Air Conditioner & Heater, 400 sq. ft., 9,000 BTU
Keystone Keystone Single Zone Summit 115V 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 115V 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 115V 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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1 to 3 of 3 Reviews .
1 – 3 of 3 Reviews
Review 1

Amazing Heating and Cooling Unit

10 days ago
The Keystone Summit 9000 BTU 400 square foot mini split AC heat pump. It is an amazing unit that provides both cooling in the summer and heat in the winter. I decide to have it installed in my shed/ workshop. I can now use my workshop any day of the year on the hottest of days and the coldest of days. Is super quiet. You don't even know it's running. Does require professional installation from an HVAC professional. Amazing unit that I would highly recommend and the description is just as described.

Originally posted on Sampling program

Review 1

Great addition to our space!

19 days ago
Installation of this mini split was done by just one person with easy instructions through the process. I’m excited to use the systems app to operate on a day to day basis. When running the system is quiet and quickly cools down the room. Very satisfied customer!

Originally posted on Sampling program

Review 1

Great size and scale for an ADU/guest house

21 days ago
This mini-split unit is the perfect size and scale for an ADU/guest house. It’s such a convenient way to condition and heat a space without the hassles of installing ductwork. I love the design of the product as it blends into the walls. As a designer, I really appreciate its compact footprint. The included remote is responsive and easy to adjust the temperature. I love how there’s even an anti-mildew and clean features. Overall, this is the perfect BTU for my garage to ADU conversion, and DIYers, homeowners, designers, and contractors will really appreciate this unit.

Originally posted on Sampling program