Finding the right mini split air conditioner for a 300 square foot space can greatly enhance comfort while optimizing energy efficiency. This guide covers top mini splits suitable for small rooms, emphasizing cooling/heating capacity, inverter technology, and quiet operation. Below is a summary table of selected units ideal for rooms near 300 sq ft, highlighting key specifications and energy ratings.
Product | Cooling Capacity (BTU) | Heating Capacity | Energy Efficiency (SEER2) | Coverage Area | Key Features |
---|---|---|---|---|---|
ROVSUN 9000 BTU Wifi Mini Split | 9000 | Heat Pump | 19 SEER2 | Up to 400 sq.ft | WiFi, inverter, ultra-quiet 28dB |
Manastin 12000 BTU Mini Split | 12000 | Heat Pump | 17 SEER2 | Up to 750 sq.ft | Fast cooling, multiple modes, inverter |
COSTWAY 12000 BTU Mini Split | 12000 | Heat Pump | 20 SEER2 | Up to 750 sq.ft | 5 modes, quiet, inverter tech |
Oylus 12000 BTU Mini Split | 12000 | 12,500 BTU Heating | 19 SEER2 | Up to 750 sq.ft | Energy saving, smart control |
DELLA Motto Series 12000 BTU Wifi Mini Split | 12000 | Heat Pump | 20 SEER2 | Up to 550 sq.ft | WiFi, Alexa compatible, smart sensor |
Content Navigation
- ROVSUN 9000 BTU Wifi Enabled Mini Split Air Conditioner & Heater
- Manastin 12000BTU Mini Split Air Conditioner & Heater
- COSTWAY 12000BTU Mini Split Air Conditioner & Heater
- Oylus Mini Split AC/Heating System – 12000 BTU
- DELLA Motto Series 12000 BTU Wifi Enabled Mini Split
- Buying Guide: How to Choose the Best Mini Split for a 300 Sq Ft Room
ROVSUN 9000 BTU Wifi Enabled Mini Split Air Conditioner & Heater

The ROVSUN 9000 BTU mini split provides powerful cooling and heating ideal for spaces up to 400 square feet. It features a heat pump capable of a wide temperature range from 61°F to 88°F, offering versatility year-round. Equipped with advanced inverter technology, it adjusts compressor speed automatically to save energy, reaching a high 19 SEER2 efficiency rating. This unit is notable for its whisper-quiet operation at just 28dB in mute mode, perfect for bedrooms or offices where silence is important. The system also includes effective dehumidification and a pre-charged condenser for rapid installation readiness.
Manastin 12000BTU Mini Split Air Conditioner & Heater

This Manastin 12000 BTU mini split is designed for fast and efficient cooling and heating, capable of cooling a room in as little as 30 seconds and heating in 60 seconds. Its inverter technology achieves a 17 SEER2 rating and utilizes R32 refrigerant, an eco-friendly choice. The unit supports a coverage area of up to 750 square feet, making it suitable for larger rooms than 300 sq ft. The system includes five operational modes (cooling, heating, auto, fan, dry) and four fan speeds, complemented by a convenient 24-hour timer and specialized modes like Turbo and ECO for energy savings and rapid temperature control.
COSTWAY 12000BTU Mini Split Air Conditioner & Heater

The COSTWAY 12000 BTU mini split unit features a high-power compressor and a 1-ton heat pump, providing efficient year-round climate control up to 750 sq.ft. It boasts a 20 SEER2 energy efficiency rating and includes five operating modes — auto, cool, dry, heat, fan — plus four fan speed settings. The inverter technology stabilizes compressor cycles, minimizing power consumption and extending unit life. Ease of use is enhanced with a remote control featuring a smart timer, sleep mode, and ECO setting, alongside ultra-quiet operation conducive to restful sleep environments.
Oylus Mini Split AC/Heating System – 12000 BTU

The Oylus 12000 BTU mini split provides balanced heating and cooling for spaces up to 750 sq.ft, supporting temperature ranges between 61°F and 88°F. It delivers a high 19 SEER2 cooling efficiency and HSPF2 8.5 heating performance, making it an energy-conscious option. The heat pump and inverter technology combine to save up to 36% energy, aided by an ECO mode to further reduce consumption. Control is simple with a remote including a 24-hour timer and LED display that can be turned off to prevent nighttime light disturbance.
DELLA Motto Series 12000 BTU Wifi Enabled Mini Split

The DELLA Motto Series 12000 BTU mini split combines WiFi functionality and Alexa compatibility with high energy efficiency at 20 SEER2, suitable for rooms up to 550 sq.ft. Its smart sensor detects temperature via the remote control rather than the indoor unit, optimizing airflow for personalized comfort and energy savings. Features include 4D air direction (up/down, left/right), various modes (cooling, heating, dry), sleep and eco modes, and multiple fan speeds. The included installation kit supports straightforward setup with standard copper lines and drain pipe.
Buying Guide: How to Choose the Best Mini Split for a 300 Sq Ft Room
Choosing the ideal mini split for a 300 square foot room requires careful consideration of several factors to ensure efficient, quiet, and cost-effective climate control.
Cooling and Heating Capacity
Select a mini split with a cooling capacity between 9000 and 12000 BTU for effective temperature regulation in a 300 sq ft space. Oversized units can lead to inefficiency and cycling issues, while undersized units may fail to maintain comfort.
Energy Efficiency (SEER Rating)
Look for high SEER2 ratings (Seasonal Energy Efficiency Ratio) – ideally above 17 SEER2 for substantial energy savings and reduced electricity bills. Inverter technology enhances efficiency by modulating compressor speed.
Heating Performance
Consider units with a heat pump that provides reliable heating during cooler months, especially if year-round climate control is needed. Heating capacity should align with room size for balanced warmth.
Noise Level and Operation
For bedrooms or small rooms, quiet operation is crucial. Many units operate between 28 to 30 decibels in mute or low modes, delivering comfort without disruption.
Smart Features and Controls
WiFi-enabled models with smartphone apps, remote controls, and smart sensors allow convenient operation. Features like timers, sleep modes, eco modes, and multi-directional airflow improve user experience.
Installation and Warranty
Ensure the product includes a comprehensive installation kit with pre-charged refrigerant lines to simplify setup. Verify warranty terms for peace of mind and post-purchase support.
Environmental Impact
Choose units using eco-friendly refrigerants such as R32 to reduce environmental impact and comply with current regulations.
Considering these factors will help you select a mini split system that delivers optimal comfort, efficiency, and convenience for a 300 square foot room.