Keystone - 12, 000 BTU Heat and Cool Window Air Conditioner, R32 - KSTHW12B
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
- Reliable Heat & Cool: Our powerful 12,000 BTU cooling capacity / 1,000 BTU supplemental heating capacity wall unit can efficiently provide comfort all year long for your living room, garage, multiple rooms on the same floor - any large space up to 550 Sq.Ft.
- All in One Unit: Enjoy powerful cooling, supplemental heating, dehumidification up to 2.5 pints per hour, and fan circulation all in one compact unit with on-board electronic controls, 3 fan speeds, sleep function, and a programmable 24-hour on/off timer.
- Smart Remote Control: The I Sense remote control takes the temperature of the room you are in, displays it on the remote's LCD screen and sends a signal to your AC unit every 3 minutes for accurate cooling, no matter where you are in your home.
- Powerful Cooling on a Budget: Our Energy Star certified AC will give your electric bill a break by using the 'Energy Saver' or Sleep' mode. These smart features automatically program your unit to use less energy while providing the same amount of comfort.
- Space Saving Design: Save your floor space with this window-mounted air conditioner. Window installation kit included. Minimum window height: 16.5 inches, window width dimensions: 26.8" minimum / 36" maximum
- 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)
- 12,000/11,600 BTU cooling capacity / 11,000 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 550 sq. ft. with dehumidification up to 2.5 pints per hour
- Indoor Noise Level dBA (Hi/Med/Lo): 60.9 / 58.3 / 54.7
- 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 6-20P plug makes extension cords unnecessary
- Adjustable, pleated window mounting kit included for window installation
- Minimum window height: 16.5 inches
- Window width dimensions: 26.8" minimum / 36" maximum
- U.L. safety listing (SA12388)
Specifications
| Model Number |
KSTHW12B |
| Brand |
Keystone |
| Category |
Air Conditioners/Window Heat/Cool |
| Mfr ID |
KEYSTN |
| UPS Shippable |
Y |
| UPC Code |
840148726765 |
| Country of Origin |
CN-China |
| Product Dimensions English |
NOTE: The dBA levels on this unit are NOT in the quiet range! (Quiet = 47-52 dBA) |
Downloads & Manual
What our Experts Think
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Year‑Round Comfort: Heat & cool function makes this unit versatile for all seasons — a top search intent for dual‑mode window AC.
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12,000 BTU Power: Ideal for medium‑sized rooms (~450 sq ft), matching high‑traffic queries like window AC with heat.
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Eco‑Friendly R32 Refrigerant: Modern, low‑GWP refrigerant appeals to environmentally conscious shoppers and boosts relevance for eco‑friendly air conditioner.
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Energy‑Efficient Operation: Helps reduce electricity costs, supporting SEO terms like efficient window air conditioner.
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Quiet, Stable Performance: Balanced cooling/heating with reduced noise — a strong match for quiet window AC searches.
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Easy Installation & Fit: Standard window design simplifies setup and aligns with easy install AC unit search phrases.
Q&A
Q: What does this unit do?
A: The Keystone KSTHW12B provides both 12,000 BTU cooling and 11,000 BTU supplemental heating in one window‑mounted unit — ideal for year‑round comfort.
Q: What room size is it suitable for?
A: It’s designed to cool and heat spaces up to ~550 sq ft, such as living rooms, bedrooms, or apartments.
Q: What electrical requirements are needed?
A: This model requires a special 230 V/20 A outlet and will not operate on a standard 115 V household outlet.
Q: Does it include remote control and easy operation?
A: Yes — it comes with a temperature‑sensing LCD remote, LED electronic controls, auto‑restart, and a programmable 24‑hour timer for convenience.
Q: What refrigerant does this unit use?
A: It uses R32 refrigerant, which improves efficiency and has a lower global warming potential.
Q: Can it replace my main heater?
A: No — the heating mode is supplemental and meant to support (not replace) your primary heating system when temps are above freezing.
Q: What additional features help efficiency?
A: It includes energy saver mode, sleep mode, and adjustable airflow with 3 fan and cooling speeds for comfort and cost savings.
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 of obstructions for optimal airflow
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Check and clear drain holes to prevent water leaks during cooling mode
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Inspect window seals to reduce energy loss and improve heating/cooling performance
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Unplug, clean, and cover the unit during off-season to extend lifespan
