Finding the right mini split air conditioner for a room around 400 sq ft requires attention to cooling capacity, energy efficiency, and smart features. Below is a comparison of five top-rated mini split AC units that deliver excellent performance, ease of installation, and modern convenience for small to medium spaces. These models combine inverter technology, heat pump functionality, and WiFi control to optimize your comfort throughout the year.
| Product | BTU Capacity | Coverage Area | Energy Efficiency | Smart Features |
|---|---|---|---|---|
| DELLA Vario Series 9000 BTU Mini Split AC | 9000 BTU | Up to 400 Sq. Ft | 19 SEER2, DC Inverter | Alexa, Wifi, Multiple Modes |
| DELLA Hyper Heat 9000 BTU WiFi Mini Split | 9000 BTU | Up to 400 Sq. Ft | 23 SEER2, Energy Star | Alexa, Wifi, 5 Modes, Heat Down to -13°F |
| DELLA Motto Series 12000 BTU Mini Split | 12000 BTU | Up to 550 Sq. Ft | 20 SEER2, DC Inverter | Alexa, Wifi, 4D Air Flow, Smart Sensor |
| MilleLoom 12000 BTU Mini Split AC | 12000 BTU | Up to 750 Sq. Ft | 22 SEER2, ETL & AHRI Certified | WiFi, Google Compatible, 5 Modes |
| TMYICE 18000 BTU Mini Split AC System | 18000 BTU | Up to 1250 Sq. Ft | 19 SEER2, Inverter Technology | Remote Control, Turbo Mode, Quiet Operation |
Content Navigation
- DELLA Vario Series 9000 BTU Mini Split AC for 400 Sq.Ft
- DELLA Hyper Heat 9,000 BTU WiFi Mini Split for 400 Sq.Ft
- DELLA Motto Series 12000 BTU Mini Split AC for Up to 550 Sq.Ft
- MilleLoom 12000 BTU Mini Split Air Conditioner with WiFi
- TMYICE 18000 BTU Mini Split AC and Heat Pump System
- Buying Guide for Choosing the Best Mini Split AC for 400 Sq Ft
DELLA Vario Series 9000 BTU Mini Split AC for 400 Sq.Ft
This 9000 BTU mini split AC by Della offers energy-efficient cooling and heating for spaces up to 400 sq ft. It features a 19 SEER2 rating, ETL listing, and AHRI certification for verified performance. The ductless inverter system with heat pump supports operation in temperatures as low as -4°F.
Smart features include 4D airflow for comprehensive circulation, an “I feel” mode that senses temperature via the remote, customizable fan speeds, turbo function, sleep mode, and eco energy-saving options. The included 16.4ft installation kit covers piping and drainage with standard copper dimensions. The system is compatible with Alexa and Wifi enabled for convenient remote control.
DELLA Hyper Heat 9,000 BTU WiFi Mini Split for 400 Sq.Ft
Designed for colder climates, this Hyper Heat 9000 BTU mini split maintains efficient heating down to -13°F and covers rooms up to 400 sq ft. The unit boasts an impressive 23 SEER2 rating with Energy Star certification, translating to lower energy bills.
It supports five operational modes including cooling, heating, dry, auto, and fan. Alexa and WiFi connectivity enable remote operation through the Della+ app. Additionally, the unit offers 4D airflow, timer, sleep mode, and eco savings features. A full 16.4ft installation kit with pre-flared copper lines is included, though professional installation is required for optimal performance.
DELLA Motto Series 12000 BTU Mini Split AC for Up to 550 Sq.Ft
The Motto Series offers a higher capacity 12000 BTU cooling and heating solution suitable for spaces up to 550 sq ft. The system is rated at 20 SEER2 with a DC inverter and runs on 110-120V power supply. It is ETL listed and AHRI certified.
Unique to this model is a smart sensor in the remote that reads room temperature, optimizing airflow and comfort more accurately. It delivers 4D airflow, multiple fan speeds, an “I feel” comfort mode, and WiFi-enabled control integrated with Alexa. The installation kit includes 13ft copper line and standard drainage piping.
MilleLoom 12000 BTU Mini Split Air Conditioner with WiFi
This 12000 BTU mini split AC supports cooling areas up to 750 sq ft but is also a reliable option for smaller spaces requiring better wattage. The system offers a 22 SEER2 efficiency rating and is ETL and AHRI certified for quality assurance.
Five operational modes provide versatile usage: cool, heat, dry, fan, and auto. The unit is compatible with WiFi and Google Home, featuring automatic defrost, self-diagnosis, iFEEL temperature sensing, and energy-saving functions. It accommodates wide temperature ranges (-4°F to 140°F) and maintains quiet operation during use.
TMYICE 18000 BTU Mini Split AC and Heat Pump System
The TMYICE mini split AC unit provides robust cooling and heating for rooms up to 1250 sq ft with an 18000 BTU rating. Featuring a 19 SEER2 inverter system and eco-friendly R32 refrigerant, it offers both efficiency and power for year-round comfort.
It includes four primary modes (cool, heat, dry, fan) plus turbo boost for rapid temperature changes and multiple fan speeds with 4D air flow. The quietest operation runs as low as 25 decibels. The smart remote features an auto-off display and programmable timer for customized scheduling.
Buying Guide for Choosing the Best Mini Split AC for 400 Sq Ft
When selecting a mini split AC for a room around 400 square feet, consider the following key factors to ensure you choose a system that matches your needs:
Cooling and Heating Capacity
BTU rating directly relates to the space a mini split can effectively cool or heat. For 400 sq ft rooms, 9000 BTU units are often optimal to balance efficiency without wasting energy.
Energy Efficiency
Look for units with high SEER2 ratings (Seasonal Energy Efficiency Ratio) and certifications such as ETL, AHRI, or Energy Star. These guarantee better energy savings and lower utility bills over time.
Heat Pump Capability and Climate Suitability
Units with reliable heat pumps that function in low temperatures (e.g., down to -13°F) are essential if you live in colder regions to maintain warmth during winter efficiently.
Smart Controls and Connectivity
Many newer mini splits include WiFi and Alexa compatibility, allowing remote operation, scheduling, and comfort personalization. Consider if smart features are important for your lifestyle.
Installation and Piping Length
Check the included installation kit for copper pipe lengths and whether they fit your home’s layout. Professional installation is recommended to ensure optimal performance and refrigerant charging.
Noise Level
Look for models that operate quietly, especially if installed in bedrooms or offices. Quiet operation (below 50 decibels) contributes significantly to comfort.
Additional Features
- 4D Airflow enhances even cooling/heating around the room.
- Modes like turbo, dry, sleep, and eco optimize comfort and efficiency.
- Temperature sensing via the remote (“I feel” mode) provides personalized comfort.
By reviewing these criteria alongside product specifications, you can confidently select the mini split AC that best fits your 400 sq ft space, maximizing comfort and efficiency all year round.