Keystone - 8, 000 BTU Heat and Cool Window Air Conditioner, R32 - KSTHW08B
At Keystone, your family’s comfort starts here. Keystone's budget-friendly heat/cool 115V 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 multi-seasonal unit 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 8,000 BTU cooling capacity / 3,500 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 350 Sq.Ft.
- All in One Unit: Enjoy powerful cooling, supplemental heating, dehumidification up to 1.9 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
- 8,000 BTU cooling capacity / 3,500 BTU supplemental heating capacity
- Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 45°F
- 7-ft. LCDI power cord with NEMA 5-15P plug uses standard 115V electrical outlet
- Designed for a room up to 350 sq. ft. with dehumidification up to 1.9 pints per hour
- Indoor Noise Level dBA (Hi/Med/Lo): 57.2 / 54.9 / 53.4
- 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
- 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 |
KSTHW08B |
| Brand |
Keystone |
| Category |
Air Conditioners/Window Heat/Cool |
| Mfr ID |
KEYSTN |
| UPS Shippable |
Y |
| Shipping Weight |
87.5 |
| 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: Heating + cooling in one unit saves space and adds seasonal versatility.
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Ideal for Small Rooms: 8,000 BTU capacity efficiently manages ~250–350 sq ft areas like bedrooms or home offices.
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Modern R32 Refrigerant: Better cooling/heating performance with lower environmental impact vs older refrigerants.
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Window‑Ready Design: Easy installation in standard windows — secure and space‑saving.
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User‑Friendly Controls: Simple settings and multiple fan speeds for tailored comfort.
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Quiet & Efficient: Smooth operation keeps noise low while maintaining stable temperatures.
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Low Maintenance: Washable filter and accessible design keep upkeep easy.
Q&A
Q: What cooling and heating functions does this unit offer?
A: Provides 8,000 BTU cooling and 3,500 BTU supplemental heating — ideal for year‑round comfort in moderate climates.
Q: What size room is it best for?
A: Designed for spaces up to ~350 sq ft, such as bedrooms, living rooms, or home offices.
Q: What refrigerant type does it use?
A: Uses R32 refrigerant for improved energy efficiency and reduced environmental impact.
Q: What convenience features are included?
A: Includes temperature‑sensing LCD remote control, electronic controls with LED display, auto‑restart, programmable 24‑hour timer, and adjustable 4‑way airflow.
Q: How energy‑efficient and user‑friendly is it?
A: Features energy saver mode, sleep mode, and dehumidification (up to ~1.9 pints/hour) to save power and improve comfort.
Q: Is it easy to install?
A: A window installation kit is included, and the unit operates on a standard 115 V outlet with a 7‑ft LCDI plug.
Maintenance Tips
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Clean or rinse the washable air filter every 2–4 weeks to keep airflow strong and efficiency high
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Wipe down the front grille and vents regularly to prevent dust buildup
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Check and clear the condensate drain to avoid water buildup and moisture issues
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Ensure the window is sealed tightly and unit is mounted securely to minimize air leaks
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Use heat/cool modes with appropriate thermostat settings to reduce runtime and wear
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Keep the area around the unit clear for proper ventilation
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Schedule an annual professional check to clean coils and inspect refrigerant (R32) and electrical components
Damage 
Loss 
Theft 
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