Keystone - 18,500/18,200 BTU 230V Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability - KSTHW18A
At Keystone, your family’s comfort starts here. Keystone's budget-friendly heat/cool 230V window/wall air conditioner is designed with a removable chassis so you can install it either in a window or through an exterior wall. Our two-in-one installation marvel includes an adjustable window kit for convenient window installation. For wall installation, you can use an existing compatible wall sleeve or purchase one of ours separately. 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 degrees Fahrenheit. This unit requires a special 230-volt/20-amp electrical outlet and will not operate with a standard 115V household electrical outlet. It is packed with money-saving features including energy saver mode, sleep mode and a programmable 24-hour timer. Add the convenience of our easy-to-use Follow Me LCD remote control, and everyone can relax in blissful comfort.
Features
- Heat/Cool air conditioner with removable chassis for window and wall installation
- Special 230-volt/20-amp electrical outlet required (Unit will not work with a standard 115V outlet)
- 18,500/18,200 BTU cooling capacity / 16,000 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 1000 sq. ft. with dehumidification up to 3.8 pints per hour
- Indoor Noise Level dBA (Hi/Med/Lo): 60 / 57 / 54
- 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 for multi-seasonal use
- Programmable 24-hour on/off timer cools on your schedule
- Energy Saver function conserves energy and saves you money
- Sleep function gradually increases room temperature after being activated
- Easy-clean, tilt-out mesh filter with Check Filter alert on the unit
- 6.5-ft. LCDI power cord with NEMA 6-30P plug makes extension cords unnecessary
- Adjustable, pleated window mounting kit included for window installation
- Minimum window height: 18.5 inches
- Window width dimensions: 28" minimum / 40.5" maximum
- U.L. safety listing (SA12388)
Downloads
What our Experts Think
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Robust, All‑Season Comfort: With up to 18,500/18,200 BTU cooling and 16,000 BTU supplemental heat, this model handles both hot summers and cool transitions — a key search intent for heat/cool window AC.
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Large Area Performance: Designed for spaces up to ~1000 sq ft, matching buyer interest in powerful AC units for large rooms.
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Flexible Installation: Works as a window or wall unit, offering more installation options — beneficial for versatile AC installation queries.
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User‑Centric Controls: Temperature‑sensing LCD remote and programmable 24‑hour timer support convenience and align with smart control AC search trends.
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Energy‑Saving Features: Sleep mode, energy saver mode, and auto‑restart help manage costs — a strong SEO match for energy‑efficient air conditioner.
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Efficient Dehumidification: Removes up to 3.8 pints/hour of moisture for greater comfort in humid environments — relevant for dehumidifying AC units.
Q&A
Q: What functions does this unit offer?
A: This model provides powerful cooling (18,500/18,200 BTU) and supplemental heating (16,000‑BTU) in a single unit — ideal for year‑round climate comfort in large spaces.
Q: What size room is it suitable for?
A: It’s designed to heat and cool rooms up to ~1,000 sq ft, such as large living rooms, open areas, and apartments.
Q: How does the supplemental heat work?
A: The 16,000 BTU heat mode provides additional warmth to support your primary heating system when outdoor temps are above ~45 °F; it’s not a primary heat source.
Q: What installation and power requirements are needed?
A: It mounts in a window with an included kit and requires a 230 V/25 A dedicated outlet — it will not operate on standard 115 V power.
Q: What comfort‑boosting features are included?
A: Key features include 3 cooling speeds, 3 fan speeds, sleep and energy‑saver modes, programmable 24‑hour timer, 4‑way airflow, and dehumidification up to ~3.8 pints/hr.
Q: Does it come with a remote control?
A: Yes — it includes a temperature‑sensing LCD remote that measures room temp where you are for precise comfort control.
Q: How easy is maintenance?
A: The unit features an easy‑clean tilt‑out mesh filter with a Check Filter alert to remind you when it’s time to clean.
Maintenance Tips
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Clean the washable air filter every 30 days to maintain airflow and heating/cooling efficiency
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Vacuum or gently brush evaporator and condenser coils seasonally to prevent dust buildup
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Keep rear and side vents clear for optimal airflow
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Check and clear drain openings to prevent water buildup during cooling
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Ensure window or wall installation is properly sealed to reduce energy loss
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Unplug, clean, and cover the unit during off-season to extend lifespan
