COSTWAY 9,000 BTU Portable AC Review: Small Room, Sleep Mode
A compact portable air conditioner for rooms up to 280 square feet, with cool, fan, dry and sleep modes, a 24-hour timer, overflow protection and both manual and continuous drainage.
By Daniel Brooks
Updated October 15, 2026
The COSTWAY 9,000 BTU Portable AC is a compact, budget-friendly portable air conditioner aimed squarely at small rooms. COSTWAY rates it for up to 280 square feet, a refreshingly modest claim among portable air conditioners that often promise far more. It has a 4.0 out of 5 average across more than 195 ratings on its listing.
The unit offers four modes, cool, fan, dry and sleep, plus a 24-hour timer, an LED touch panel and a remote. Two drainage options and automatic overflow protection make it easy to manage the water it collects.
Our Verdict
The COSTWAY 9,000 BTU is a sensible pick for a small bedroom, dorm, office or kitchen where you want simple spot cooling at a low price. The 280 square foot rating is realistic, the smart sleep mode is a nice touch, and a footprint of just 12 by 13 inches fits almost anywhere.
The trade-offs are two fan speeds, no Wi-Fi and a window kit sized for sliding windows. It is also heavier than its size suggests at 52 pounds. For a small room and a tight budget, it covers the essentials well.
COSTWAY 9,000 BTU Portable Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | COSTWAY |
| Model | FP10343US-WH |
| Type | Portable air conditioner |
| Cooling Capacity | 9,000 BTU (listed) |
| Room Size | Up to 280 sq ft (manufacturer) |
| Temperature Range | 61 to 88 degrees F |
| Noise Level | 50 to 53 dB |
| Power | 115 volts, 874 watts |
| Modes | Cool, fan, dry, sleep |
| Fan Speeds | 2 (low and high) |
| Window Kit Range | 25.5″ to 47″ |
| Dimensions | 12″D x 13″W x 27″H |
| Weight | 52 pounds |
| Refrigerant | R-410A |
Cooling Capacity and Room Size
COSTWAY lists 9,000 BTU of cooling and rates the unit for rooms up to 280 square feet. The listing does not give a separate SACC or DOE rating, which would show real-world cooling after accounting for the exhaust. Even so, the 280 square foot claim is conservative compared with many portables in this class, and that makes it easier to size correctly.
A small bedroom, home office, dorm room or kitchen is the right fit. For a larger room or one with a lot of afternoon sun, a bigger portable will hold the temperature better.
You can set the temperature anywhere from 61 to 88 degrees F. The compressor is a standard non-inverter type.
Installation and Fit
The box includes the unit, an exhaust hose, a hose connector, an adapter, a window kit, a drain hose, a remote and a user guide. The window kit fits vertical or horizontal sliding windows with an opening between 25.5 and 47 inches.
The unit is small. At 12 inches deep, 13 inches wide and 27 inches tall, it slips into a corner or beside a nightstand. It weighs 52 pounds, which is more than its size suggests, but two carry handles and four universal wheels make it easy to roll from room to room.
The louver is adjusted by hand. COSTWAY says it can turn 115 degrees vertically and 96 degrees horizontally, so you can aim cool air where you sit.
Noise, Energy Use and Efficiency
COSTWAY lists a noise range of 50 to 53 dB. That is on the quieter side for a portable, which helps in a bedroom or office. Sleep mode helps further at night.
Rated power is 874 watts on 115 volts, which is light for an air conditioner and easy on a standard circuit. The listing shows a SEER of 4.62. Use the timer to limit run time and keep the hose short to get the most cooling for the power you use.
Controls and Features
An LED touch panel on top shows the temperature, timer and fan speed. The remote works from up to 16.5 feet away, so you can change settings from a bed or sofa.
Smart sleep mode raises the set temperature by 1.8 degrees F each hour. The gradual change keeps you comfortable as your body cools during sleep, while cutting the unit’s workload through the night. The 1 to 24 hour timer can switch the unit on or off automatically. There is no Wi-Fi or app control.
Dehumidifying and Drainage
Dry mode removes moisture on muggy days. COSTWAY lists a capacity of 50 pints, and the unit offers two ways to handle the water. For occasional use, drain it manually. For long dehumidifying sessions, connect the included 2 foot drain hose for continuous drainage.
Overflow protection shuts the unit off automatically when the internal tank is full, which prevents leaks onto your floor. The filter is removable and can be washed with water. Clean it every couple of weeks in heavy use.
Placement and Everyday Use
Because the footprint is so small, the COSTWAY fits places larger portables cannot, such as the gap between a bed and a wall or the corner of a home office. Keep a few inches of clear space around the back so the unit can draw in air, and place it close to the window so the exhaust hose stays short.
In a kitchen, aim the louver toward where you cook rather than across the whole room. In a bedroom, run the unit on high for a short while before bed, then switch to sleep mode so the temperature eases up through the night. Closing the door keeps the cool air in the room you are using, which matters with a smaller unit like this.
Pros and Cons
| Pros | Cons |
|---|---|
| Realistic 280 sq ft room rating | No SACC or DOE rating listed |
| Tiny 12 by 13 inch footprint | Only two fan speeds |
| 50 to 53 dB on the quieter side | No Wi-Fi or app control |
| Smart sleep mode and 24-hour timer | Window kit is for sliding windows |
| Overflow protection and two drain options | Heavy for its size at 52 pounds |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Small bedrooms, dorms and offices | Rooms larger than about 280 sq ft |
| Budget buyers who want simple controls | Smart home users who want app control |
| Kitchens that need spot cooling | Double-hung windows without adaptation |
| Anyone with limited floor space | Buyers who need lots of fan settings |
Final Verdict
The COSTWAY 9,000 BTU Portable AC is an honest, compact portable for small rooms. Its realistic 280 square foot rating, smart sleep mode, timer and overflow protection make it easy to live with, and its tiny footprint fits where larger units will not. Expect only two fan speeds and no smart features. You can check the current price and details for the COSTWAY 9,000 BTU Portable Air Conditioner.
Frequently Asked Questions
What size room does the COSTWAY 9,000 BTU cool?
COSTWAY rates it for rooms up to 280 square feet, such as a small bedroom, dorm, office or kitchen.
How does sleep mode work?
In sleep mode, the set temperature rises by 1.8 degrees F every hour. That keeps you comfortable overnight while reducing the unit’s workload.
What windows does the kit fit?
The kit fits vertical or horizontal sliding windows with an opening between 25.5 and 47 inches.
What happens when the tank is full?
Overflow protection shuts the unit off automatically. You can drain it manually or connect the included hose for continuous drainage.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.