Keystone - 25,000/24,700 BTU 230V Window/Wall Air Conditioner with 16,000 BTU Supplemental Heat Capability - KSTHW25A
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)
- 25,000/24,700 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 1500 sq. ft. with dehumidification up to 5.7 pints per hour
- Indoor Noise Level dBA (Hi/Med/Lo): 63 / 60 / 58
- 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: 19.5 inches
- Window width dimensions: 31" minimum / 42" maximum
- U.L. safety listing (SA12388)
Downloads
What our Experts Think
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Powerful All‑Season Comfort: High 25,000 BTU cooling paired with 16,000 BTU supplemental heat covers large spaces up to ~1,500 sq ft with effective year‑round comfort.
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Versatile Installation: Removable chassis supports both window and through‑the‑wall mounting for flexible setup.
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Supplemental Heat Support: Heat mode assists your main heating system when outdoor temps are above ~45°F (not a primary heat source), ideal for shoulder seasons.
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Smart Controls & Convenience: Temperature‑sensing LCD remote delivers accurate comfort where you are; programmable timer, sleep and energy‑save modes enhance comfort and efficiency.
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Balanced Performance: Multi‑speed fan, 4‑way airflow, and dehumidification (up to ~5.7 pts/hr) help maintain ideal indoor conditions.
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Stable 230 V Power: Requires dedicated 230 V/20–25 A circuit — delivers steady, robust cooling/heating performance.
Q&A
Q: What cooling and heating capacities does this unit offer?
A: Provides 25,000/24,700 BTU cooling and 16,000 BTU supplemental heating to keep large spaces comfortable year‑round.
Q: What room size is this designed for?
A: Suitable for large rooms up to ~1,500 sq ft like living rooms, dens, and open areas.
Q: How does the supplemental heat function work?
A: The supplemental heating mode provides additional heat when outdoor temperatures are moderate (above ~45°F), but it’s not intended as the primary heat source.
Q: What installation options are available?
A: Removable chassis allows window or through‑the‑wall installation (wall sleeve not included).
Q: What features enhance comfort and convenience?
A: Includes temperature‑sensing LCD remote, electronic controls with LED display, programmable 24‑hour timer, sleep mode, and energy saver mode.
Q: Does it help with humidity?
A: Yes — it can dehumidify up to ~5.7 pints per hour for improved indoor comfort.
Q: What electrical requirements does it have?
A: Requires a 230 V/25‑amp outlet — it won’t operate on a standard 115 V outlet.
Maintenance Tips
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Clean the washable air filter every 2–4 weeks to maintain airflow and peak cooling/heating efficiency
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Wipe down the front grille and vents regularly to prevent dust buildup that restricts airflow
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Inspect and clear condensate drains to prevent moisture buildup and leaks
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Ensure secure installation & sealing in window or wall sleeve to minimize air leaks and improve performance
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Use heat/cool modes with appropriate thermostat settings to reduce runtime and energy use
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Keep surrounding area clear for proper ventilation and optimal airflow
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Schedule annual professional service for coil cleaning, refrigerant check, and electrical inspection
