Cooling a 400 square feet room efficiently requires a reliable portable air conditioner with adequate BTU, smart features, and quiet operation. Below is a summary table highlighting 5 top portable air conditioners suitable for spaces around 400 sq ft, providing various cooling capacities, modes, and convenient controls.
| Product | Cooling Capacity | Modes | Special Features |
|---|---|---|---|
| Grelife 3-in-1 Portable Air Conditioner | Suitable for 400 sq ft | Cool, Fan, Sleep | Detachable water tank, 360° oscillation, ultra-quiet |
| Shinco 12,000 BTU Portable Air Conditioner | 12,000 BTU (up to 400 sq ft) | Cool, Fan, Dehumidifier | Remote, 24-hour timer, easy installation kit |
| DollarDash 8,000 BTU Portable AC Unit | 8,000 BTU (up to 400 sq ft) | Cool, Fan, Dehumidifier | Whisper-quiet, 24-hour timer |
| Antarctic Star 10,000 BTU Portable Air Conditioner | 10,000 BTU (up to 400+ sq ft) | Cool, Fan, Dehumidifier | LED display, remote control |
| JYMIPA 10,000 BTU Portable Air Conditioner | 10,000 BTU (up to 450 sq ft) | Cool, Fan, Dehumidify, Sleep | Auto-louver airflow, caster wheels, 24-hour cycle timer |
Content Navigation
- Grelife 3-in-1 Portable Air Conditioner for 400 Sq.Ft
- Shinco 12,000 BTU Portable Air Conditioner with Remote
- DollarDash 8000 BTU Portable AC Unit for 400 Sq Ft
- Antarctic Star 10,000 BTU Portable Air Conditioner with Remote
- JYMIPA 10,000 BTU 4-in-1 Portable Air Conditioner
- Buying Guide for Portable Air Conditioners Suitable for 400 Sq Ft
Grelife 3-in-1 Portable Air Conditioner for 400 Sq.Ft

The Grelife 3-in-1 Portable Air Conditioner comes with a triple-layer cooling system and 3D honeycomb filters to rapidly circulate air throughout a 400 sq.ft area. It delivers a turbo wind speed of 30 ft/s with wide oscillation that ensures even cooling distribution in living rooms, offices, or open areas.
It features a large 1.72-gallon detachable water tank that works efficiently with four high-density ice packs, accelerating the cooling process. Dual fill ports allow effortless refills without needing to move the unit.
This model offers three modes — Turbo, Natural, and Sleep — along with three adjustable wind speeds (15/20/30 ft/s). The Sleep mode operates quietly at 42 dB, quieter than a standard desk fan, and includes an 8-hour auto-off timer, making it ideal for bedrooms or offices.
Shinco 12,000 BTU Portable Air Conditioner with Remote

The Shinco 12,000 BTU Portable Air Conditioner provides robust cooling power suitable for rooms up to 400 sq.ft. Its adjustable temperature range from 60℉ to 86℉ enables a customizable cooling experience. The unit’s 3-in-1 functionality allows users to switch between cooling, fan, and dehumidifier modes without extra tools for installation.
With a dehumidification capacity up to 43.2 liters a day and self-evaporating operation, this model minimizes maintenance. The included exhaust hose and window sealing kit offer quick installation and efficient hot air exhaust, enhancing overall user convenience.
DollarDash 8000 BTU Portable AC Unit for 400 Sq Ft

The DollarDash 8000 BTU Portable Air Conditioner efficiently cools spaces up to 400 sq.ft, with the ability to adjust for slightly larger areas up to 500 sq.ft using its 10,000 BTU setting. It operates quietly at noise levels under 45 dB, facilitating comfortable use even during sleep.
This 3-in-1 climate master unit includes cooling, dehumidifying, and fan modes to match seasonal needs. The smart 24-hour timer offers optimized performance with energy savings, making it suited for bedrooms, dormitories, or offices.
Antarctic Star 10,000 BTU Portable Air Conditioner with Remote

The Antarctic Star 10,000 BTU Portable AC unit offers strong cooling efficiency ideal for rooms above 400 sq.ft. It features an energy-efficient compressor capable of maintaining temperatures between 61°F and 86°F. Its design includes 3-in-1 functions: cooling, fan, and dehumidifying modes.
Controls are easy with an LED display and remote, allowing users to adjust temperature and fan speed conveniently. The device is versatile for apartments, kitchens, or home offices seeking consistent and stable cooling.
JYMIPA 10,000 BTU 4-in-1 Portable Air Conditioner

The JYMIPA 10,000 BTU Portable Air Conditioner cools rooms up to 450 sq.ft and offers a 4-in-1 operational mode: cooling, fan, dehumidify, and sleep. It maintains temperatures from 63°F to 86°F with precise control and features an auto-louver ensuring even airflow distribution.
Equipped with caster wheels and side handles, it ensures mobility, while the included window exhaust kit simplifies setup. A 24-hour cycle timer lets users program cooling or energy-saving off periods, enhancing convenience and operational efficiency.
Buying Guide for Portable Air Conditioners Suitable for 400 Sq Ft
Cooling Capacity (BTU)
BTU (British Thermal Units) rating determines a portable AC’s cooling power. For rooms up to 400 sq ft, units with BTU ratings from 8,000 to 12,000 are best suited, balancing efficiency and quick temperature reduction.
Modes and Features
Look for 3-in-1 or 4-in-1 functions incorporating cooling, fan, and dehumidifier modes. This versatility ensures usability across different weather conditions and helps maintain indoor air quality by reducing humidity.
Noise Level
Operating sound is critical, especially in bedrooms or offices. Units with noise levels below 50 dB are preferable for quiet and undisturbed environments. Sleep modes further reduce noise for nighttime use.
Portability and Installation
Consider units with caster wheels and lightweight design for easy maneuverability. Simple installation kits with exhaust hoses and window sealing kits are beneficial for quick, tool-free setup.
Control Options
Remote control and LED panel displays provide convenient temperature and mode adjustments. Some models offer smart connectivity with apps and voice assistants for added convenience.
Energy Efficiency
Opt for units that incorporate energy-saving features like auto timers, sleep mode, and efficient compressors. These help reduce electricity costs while maintaining comfort.
Water Management
Portable AC units often require water drainage or evaporation for condensate. Models with auto-evaporation technology or large water tanks reduce maintenance and prevent water spills.