Keystone - 8,000 BTU Heat and Cool Window Air Conditioner - KSTHW08A
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
- HEAT/COOL AIR CONDITIONER: 8,000 BTU cooling capacity / 3,500 BTU supplemental heating capacity to effectively cool or heat your apartment, bedroom, living room, or home to the temperature that is right for you.
- POWERFUL HEATING OPTION: Supplemental heat capability provides an additional heat source to your main heat source when outdoor temperatures are above 45°F for your convenience. The unit has 3 cooling speeds, 3 fan speeds, and 1 heat speed for multi-seasonal use.
- FUNCTIONALITY: Designed for a room up to 350 sq. ft. with dehumidification up to 1.9 pints per hour. Has an adjustable 4-way air flow direction allows you to easily control the direction of the cool air!
- EASY TO INSALL: with removable chassis for easy window and wall installation.
- Special 230-volt/25-amp electrical outlet required (Unit will not work with a standard 115V outlet).
- 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)
Downloads
What our Experts Think
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Year‑Round Comfort: Heat and cool functions make this unit versatile — ideal for shoppers searching window AC with heat.
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8,000 BTU Capacity: Perfect for small rooms (~250–350 sq ft), aligning with common 8,000 BTU AC search intent.
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Energy‑Efficient Performance: Designed to keep energy use down — boosts SEO relevance for efficient window air conditioner.
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Eco‑Friendly Refrigerant: Modern cooling tech appeals to eco‑friendly AC buyer interest.
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Quiet, Reliable Operation: Smooth operation with reduced noise — supports quiet window AC search trends.
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Easy Installation: Standard window fit makes setup straightforward and matches easy install AC queries.
Q&A
Q: What are the primary functions of this unit?
A: The Keystone KSTHW08A delivers 8,000 BTU cooling and 3,500 BTU supplemental heating in one window‑mounted AC, offering year‑round comfort.
Q: What room size is it best for?
A: It’s ideal for spaces up to ~350 sq ft, such as bedrooms, apartments, or small living areas.
Q: What modes and features does it include?
A: Features include 3 cooling speeds, 3 fan speeds, energy saver mode, sleep mode, programmable 24‑hour timer, and adjustable 4‑way airflow for tailored comfort.
Q: Does it come with a remote control?
A: Yes — it includes a temperature‑sensing LCD “Follow Me” remote that helps maintain your preferred temperature from across the room.
Q: How easy is it to install and maintain?
A: The unit has a slide‑out/removable chassis for easy window installation and a washable mesh filter with a check‑filter alert for simple maintenance.
Q: Does it help remove humidity?
A: Yes — it dehumidifies up to 1.9 pints per hour to improve indoor air comfort.
Q: What power requirements are needed?
A: It runs on a standard 115 V outlet with a 7‑ft LCDI power cord and NEMA 5‑15P plug — no special wiring required.
Q: Is the heating mode a primary heat source?
A: No — the heating function is supplemental and designed to assist your main heating system at moderate temperatures.
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 holes to prevent water buildup during cooling
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Ensure window seals are tight to reduce energy loss
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Unplug, clean, and cover the unit during off-season to extend lifespan
Damage 
Loss 
Theft 
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