--- product_id: 544295825 title: "Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner with Supplemental Heat, Quiet High Efficiency Window AC Unit with Remote for Apartment, Medium-Large Rooms up to 550-Sq.Ft." brand: "keystone" price: "39027840₫" currency: VND in_stock: true reviews_count: 5 url: https://www.desertcart.vn/products/544295825-keystone-energy-star-12-000-btu-window-mounted-inverter-air store_origin: VN region: Vietnam --- # 22% quieter operation 10,000 BTU heating 12,000 BTU cooling Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner with Supplemental Heat, Quiet High Efficiency Window AC Unit with Remote for Apartment, Medium-Large Rooms up to 550-Sq.Ft. **Brand:** keystone **Price:** 39027840₫ **Availability:** ✅ In Stock ## Summary > 🌬️ Chill out in style with Keystone's ultimate comfort solution! ## Quick Answers - **What is this?** Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner with Supplemental Heat, Quiet High Efficiency Window AC Unit with Remote for Apartment, Medium-Large Rooms up to 550-Sq.Ft. by keystone - **How much does it cost?** 39027840₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/544295825-keystone-energy-star-12-000-btu-window-mounted-inverter-air) ## Best For - keystone enthusiasts ## Why This Product - Trusted keystone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Maintenance Made Easy:** Stay informed with a clean filter alert, ensuring your air stays fresh and your unit runs efficiently. - • **Whisper-Quiet Comfort:** Experience tranquility with 22% quieter operation on low settings—perfect for peaceful nights. - • **Smart Inverter Technology:** Optimize energy use with advanced inverter technology that adjusts motor speed for maximum efficiency. - • **Effortless Climate Control:** Stay cool in summer and warm in winter with 12,000 BTUs of cooling and 10,000 BTUs of heating. - • **User-Friendly Installation:** Designed to fit windows 14.5-in. tall and 24-38.5-in. wide, making setup a breeze. ## Overview The Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner is a high-efficiency unit designed for medium to large rooms up to 550 sq. ft. It features powerful cooling and heating capabilities, operates quietly, and includes user-friendly installation and maintenance features. ## Description Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner with Supplemental Heat, Quiet High Efficiency Window AC Unit with Remote for Apartment, Medium-Large Rooms up to 550-Sq.Ft. ## Features - Cooling Power: This air conditioner has 12,000 BTUs of cooling power, 10,000 BTUs of heating power, and dehumidifies the air up to 1.73 pints per hour in rooms up to 550 sq. ft. - Inverter Technology: Eliminates wasted operation in the air conditioner by controlling the motor speed to exactly the amount of power that is needed to keep the room at the desired temperature - Quieter Operation: The inverter technology not only makes the unit more energy efficient, but allows it to operate 22% quieter on low and 5% quieter on high than regular window units - Easy to Install: Air conditioner fits in windows 14.5-in. tall with a minimum of 24-in. wide and maximum 38.5-in. wide - Washable Filter: A clean filter alert conveniently notifies you to clean the unit's washable filter to ensure it keeps running efficiently ## Images ![Keystone Energy Star 12,000 BTU Window Mounted Inverter Air Conditioner with Supplemental Heat, Quiet High Efficiency Window AC Unit with Remote for Apartment, Medium-Large Rooms up to 550-Sq.Ft. - Image 1](https://m.media-amazon.com/images/I/81PsAKp8shL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐ 4.0 out of 5 stars very quiet *by M***. on Reviewed in the United States on September 16, 2023* im trying to cool/heat 510sqf doubt it will do that but it blows very cold and is very quiet ### ⭐⭐⭐ 3.0 out of 5 stars P65 (Cancer) Warning *by C***S on Reviewed in the United States on September 7, 2023* Before purchasing this item I searched Amazon's site & called into them for product support to see if this item qualified for the P65 Warning & was told it was not. Although it is not required by law to declare this warning to the public in states other than California...most companies do the information available. When I received this a/c product the P65 Warning was clearly stated/labeled on the outside of the product box. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars It works *by A***R on Reviewed in the United States on September 9, 2023* Great product!It’s enough to cool my 900 square foot florida home in the month of august to a comfortable 73fWorking out better then expected --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/544295825-keystone-energy-star-12-000-btu-window-mounted-inverter-air](https://www.desertcart.vn/products/544295825-keystone-energy-star-12-000-btu-window-mounted-inverter-air) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-22*