Keystone - 8,000 BTU Slider/Casement Window AC - KSTSW08A
The Keystone 8,000 BTU slider/casement room air conditioner is ideal for cooling spaces up to 350 sq. ft. Specifically designed for horizontal slider or casement windows, it’s a great solution for homes without traditional double-hung windows. With 3 fan speeds and a 4-way air direction control, you can cool your room quickly or maintain comfort as needed. The unit also has built-in Dehumidification capabilities, removing 0.9 liters per hour. The slide-in/slide-out washable filter removes dust and odors, and a built-in filter indicator will alert you when it’s time to clean. The Sleep mode and programmable timer ensure comfort without disturbing your sleep, and the energy saver mode provides peace of mind knowing your home is comfortable without excessive energy costs.
Features
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Convenient Cooling: Fits standard sliding and casement windows, ideal for apartments, bedrooms, living rooms, home offices, or attics. Rated at 8,000 BTUs, suitable for a room up to 350 square feet.
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Maximum Comfort: Offers 3 cooling modes, 3 fan speeds, 4-way adjustable air louvers, and a programmable timer. Efficient built-in dehumidification system removes 0.9 pints of moisture from the air every hour.
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Control Your Comfort: 4-way air direction control allows optimal comfort by directing the air where needed most.
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Powerful Cooling on a Budget: Energy Star certified AC with ‘Energy Saver’ or ‘Sleep’ mode for less energy consumption without compromising comfort.
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Easy to Use: Designed with a removable chassis for installation in a window or through an exterior wall. An adjustable window kit is included for convenient installation. Minimum window height: 21.3"; Minimum to Maximum window width: 15.5" - 16.3"
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Additional Features: Slide-In/Slide-Out washable mesh filter removes dust and airborne particles. Check filter indicator alerts when it’s time to wash your filter. Dehumidifies up to 0.9 Liters per hour.
Downloads and Manual
What our Experts Think
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Perfect for Small–Medium Rooms: 8,000 BTU cooling efficiently handles spaces ~250–350 sq ft — ideal for bedrooms, offices, and smaller living areas.
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Slider/Casement Friendly: Designed for secure, snug installation in slider and casement windows without gap kits.
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Balanced Performance & Value: Delivers dependable cooling at a budget‑friendly price point.
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Simple, Intuitive Controls: Easy‑to‑use settings and adjustable fan speeds for personalized comfort.
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Quiet Operation: Smooth airflow and reduced vibration keep noise levels comfortable.
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Low Maintenance: Washable filter and accessible design make upkeep easy.
Q&A
Q: What type of windows does this AC fit?
A: Designed specifically for horizontal slider and casement windows — not compatible with standard double‑hung windows.
Q: How much cooling power does it provide?
A: Offers 8,000 BTU cooling capacity, ideal for rooms up to ~350 sq ft.
Q: What comfort features are included?
A: Provides 3 fan speeds, 4‑way air direction control, Sleep mode, Energy Saver mode, and a programmable timer for personalized comfort.
Q: Does it help control humidity?
A: Yes — an integrated dehumidification function removes moisture while cooling.
Q: Does this unit include a remote?
A: Yes — remote control is included for convenient operation.
Q: How easy is it to install and maintain?
A: Includes an adjustable installation kit for slider/casement windows and a slide‑in/slide‑out washable filter with a filter‑alert indicator for easy upkeep.
Q: What power requirements does it have?
A: Operates on 115 V power with a standard plug and digital controls
Maintenance Tips
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Clean or rinse the washable air filter every 2–4 weeks to maintain airflow and cooling efficiency
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Wipe down the front grille and vents regularly to prevent dust buildup
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Ensure the window seal and mounting are secure to reduce air leaks and vibration
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Check and clear the condensate drain to prevent moisture issues
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Use Energy Saver and proper thermostat settings to reduce runtime and energy use
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Keep the area around the unit clear for proper ventilation
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Schedule an annual professional checkup for coil cleaning and electrical inspection
