Keystone - 8,000 - 14,000 BTU Through the Wall Heat/Cool Air Conditioner - KSTAT08-1HC
The Keystone 8,000 - 14,000 BTU 115-230 Volt through-the-wall air conditioner with 4,200-10,600 BTU Supplemental Heat Capability is perfect for rooms up to 350-700 sq. ft. In addition to cooling, this versatile unit also offers supplemental heat capability, providing you with an additional heat source to your main heat source when outdoor temperatures are above 45°F. It has electronic controls with LED display and a temperature sensing LCD remote control allowing you to conveniently see, set and maintain the room temperature from across the room. Money saving features include energy saver mode, sleep mode and a programmable 24-hour timer. Plus, quiet operation (51.8 dB on low) helps you get a good night's sleep. This unit is designed for through-the-wall installation and is not designed for standard window installation (WALL SLEEVE SOLD SEPARATELY).
Features
- Through-the-wall installation (Not suitable for window installation)
- Standard, universal interior trim kit for existing wall sleeve included (New wall sleeve sold separately: KSTSLV1)
- Special 230-volt/20-amp electrical outlet required (Unit will not work with a standard 115V outlet)
- 14,000 BTU cooling capacity / 10,600 BTU supplemental heating capacity
- 12,000 BTU cooling capacity / 10,600 BTU supplemental heating capacity
- 10,000 BTU cooling capacity / 10,600 BTU supplemental heating capacity
- 8,000 BTU cooling capacity / 4,200 BTU supplemental heating capacity
- Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 45°F
- Designed for a room up to 450 sq. ft.
- Dehumidification up to 2.3 pints per hour
- Electronic controls with LED display allows you to easily select options with the touch of a button
- Temperature sensing LCD remote control allows you control the temperature from across the room
- Auto-restart saves your settings for when power is restored to the unit
- Adjustable 4-way air flow direction allows you to easily control the direction of the cool air
- 3 cooling speeds, 3 fan speeds, and 1 heat speed
- Auto function determines the fan speed depending on the set temperature
- Programmable 24-hour on/off timer cools on your schedule
- Energy-saver mode conserves energy and saves you money
- Sleep mode gradually increases room temperature after being activated
- Easy-clean mesh filter with Check Filter alert on the unit
- 6.5 ft. power cord with NEMA 6-15P grounding plug makes extension cords unnecessary
Downloads
What our Experts Think
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All‑Season Comfort: Combined heating and cooling in one unit adds versatility for year‑round use.
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Flexible Capacity Range: 8,000–14,000 BTU suits small to medium rooms — efficient performance across varied spaces.
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Through‑the‑Wall Design: Permanent installation reduces noise and vibration while freeing up window space.
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Customizable Comfort: Multiple modes and fan speeds let users dial in precise temperature and airflow.
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Energy‑Smart Operation: Balanced cooling/heating helps manage energy use and operating costs.
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Low Maintenance: Washable filter and accessible panels make upkeep quick and simple.
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Reliable Build: Durable design delivers consistent performance and long‑term value.
Q&A
Q: What cooling and heating capacities does this unit offer?
A: The range covers 8,000 to 14,000 BTU cooling and up to 10,600 BTU supplemental heating — versatile year‑round climate control.
Q: What size room is this designed for?
A: Suitable for medium to large rooms, typically 350–700 sq ft depending on BTU capacity.
Q: What installation type is required?
A: Designed for through‑the‑wall installation (not for standard window mounting). A wall sleeve is sold separately.
Q: Does it include a remote and controls?
A: Yes — features electronic controls with LED display and a temperature‑sensing LCD remote for convenient adjustments.
Q: What comfort and energy‑saving features are included?
A: Includes energy‑saver mode, sleep mode, programmable 24‑hour timer, and auto‑restart, plus adjustable 4‑way airflow to customize comfort.
Q: Does it help with humidity control?
A: Yes — built‑in dehumidification removes excess moisture to improve overall comfort.
Q: Is it quiet?
A: Engineered for quiet operation, making it suitable for living spaces and bedrooms.
Maintenance Tips
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Clean or rinse the washable air filter every 2–4 weeks to maintain airflow and efficiency
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Wipe the front grille and vents regularly to prevent dust buildup
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Inspect and clear the condensate drain and ensure wall sleeve seals are tight to avoid moisture issues
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Use heat/cool mode appropriately and set thermostat wisely to reduce runtime and wear
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Keep surrounding area clear for proper ventilation and airflow
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Schedule an annual professional service to clean coils and check refrigerant and electrical components
