The 3 Best Window Air Conditioners Under $400
We looked at window air conditioners under $400 using manufacturer specs, independent reviews and owner reports. Each pick lists what it does well and where it falls short, so you can match it to how you'll use it.
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Quick picks
Best overall
1.Midea 8,000 BTU U-Shaped Smart Inverter Window Air Conditioner
Brand: Midea
ASIN: B0FDQGPCG7
Key specs: 8,000 BTU inverter compressor, Cools rooms up to 350 sq ft, As low as 32 dBA on low fan.
Key Specifications & Features:
- 8,000 BTU inverter compressor
- Cools rooms up to 350 sq ft
- As low as 32 dBA on low fan
- 37% more efficient than the federal minimum standard
- Typically $230 to $400 depending on sale timing
Strengths
- 37% efficiency gain lowers the electric bill over a full cooling season
- U-shaped frame lets the window lock down for added security
Limitations
- Installation across the sash takes longer than a standard slide-in unit
- Midea's 2025 recall and repair program covers some early U-shaped units over a mold-related drain issue
Key specs: 8,000 BTU cooling capacity, Cools rooms up to 340 sq ft, LG ThinQ Wi-Fi app control.
Key Specifications & Features:
- 8,000 BTU cooling capacity
- Cools rooms up to 340 sq ft
- LG ThinQ Wi-Fi app control
- 3 cooling and 3 fan speeds
- Typically $300 to $320
Strengths
- LG ThinQ app adds remote scheduling that some pricier fixed-speed units skip
- 340 sq ft coverage handles most bedrooms and smaller living rooms
Limitations
- Fixed-speed compressor is louder at full cooling than the inverter units in this list
- No U-shaped or flex-depth frame for a tighter window seal
3.Frigidaire 8,000 BTU Smart Inverter Window Air Conditioner FHWW085WE1
Brand: Frigidaire
ASIN: B0CFYFCNBW
Key specs: 8,000 BTU inverter compressor, Cools rooms up to 350 sq ft, 6-way directional airflow.
Key Specifications & Features:
- 8,000 BTU inverter compressor
- Cools rooms up to 350 sq ft
- 6-way directional airflow
- 42 dBA rated operation
- Typically $329 to $429
Strengths
- Inverter compressor at a price close to the LG's fixed-speed unit
- 6-way vents throw air further across a wider room than a fixed 2-way vent
- PureAir washable filter is simple to maintain
Limitations
- Fewer long-term owner reviews than the LG or Midea
- 42 dBA is the highest rated noise figure among the inverter units in this list
How we chose
- Picks are based on manufacturer specs, independent reviews and owner reports. We don't claim our own testing.
- We do not list prices or star ratings because they change. Check Amazon for current details.