Choosing the right 4 zone mini split system allows you to control the temperature in multiple rooms independently, offering energy-efficient comfort year-round. Below is a summary of some of the best multi-zone mini split air conditioners that deliver powerful cooling, heating, and smart features. These systems vary by BTU capacity, energy ratings, and included equipment, so you can find the best fit for your space and climate.
Product | BTU Capacity | Energy Efficiency (SEER2) | Voltage | Smart Features |
---|---|---|---|---|
Della 36K BTU Quad 4 Zone Mini Split | 9K+9K+12K+18K | 19 SEER2 | 208-230V | Works with Alexa, Wifi |
COSTWAY 30k Quad 4 Zone Mini Split AC | 9K+9K+9K+18K | 23 SEER2 | 208-230V | Wifi Enabled |
TOSOT 36,000BTU Quad 4 Zone Mini Split AC | 9K+9K+9K+9K | 21 SEER2 | 230V | Wifi-Enabled |
ROVSUN 4 Zone 35000 BTU Mini Split AC | 12K+12K+12K+12K | 19 SEER2 | 208-230V | Wifi Compatible |
OLMO 36,000 BTU Quad 4-Zone Mini Split | 9K+9K+9K+9K | 21 SEER2 | 230V | Smart Port App Control |
Content Navigation
- Della 36K BTU Quad 4 Zone Mini Split with Alexa
- COSTWAY 30k Quad 4 Zone Mini Split AC with Wifi
- TOSOT 36,000BTU Quad 4 Zone Mini Split AC Cosmo Series
- ROVSUN 4 Zone 35000 BTU Mini Split AC and Heating System
- OLMO 36,000 BTU Quad 4-Zone Ductless Mini Split System
- Buying Guide For Choosing The Best 4 Zone Mini Split System
Della 36K BTU Quad 4 Zone Mini Split with Alexa

The Della 36K BTU 4 zone system offers versatile coverage suitable for up to 2,350 square feet, featuring four indoor units (9,000+9,000+12,000+18,000 BTU) with individual controls for each area. It operates efficiently in climates as cold as 5°F with its inverter and heat pump technology. The unit supports Alexa voice control and includes full installation kits with copper line sets and drain pipes. Certified by ETL and AHRI, the unit emphasizes energy efficiency with a 19 SEER rating and offers up to 30% power savings. Note the model does not perform self-cleaning despite the button presence.
COSTWAY 30k Quad 4 Zone Mini Split AC with Wifi

The COSTWAY 30k BTU 4 zone mini split is designed to precisely cool and heat multiple rooms independently with indoor units rated 9,000 and 18,000 BTU. Certified with a high 23 SEER2 and 10 HSPF2 ratings, it uses R32 refrigerant for a greener footprint and reduces energy consumption significantly. Equipped with six operational modes including auto, cool, heat, dry, fan, and sleep, the system supports five fan speeds and offers wifi connectivity for enhanced control.
TOSOT 36,000BTU Quad 4 Zone Mini Split AC Cosmo Series

The TOSOT Cosmo series 36,000 BTU multi-zone system includes four 9,000 BTU indoor units for balanced temperature control in four rooms. Rated at 21 SEER2 and 10 HSPF2, it delivers up to 24% energy savings versus older systems. The unit performs well in extreme weather, functioning in temperatures from -22°F to 118°F with an intelligent defrost feature to improve heating efficiency. The system is Energy Star certified and eligible for federal rebates.
ROVSUN 4 Zone 35000 BTU Mini Split AC and Heating System

The ROVSUN 35,000 BTU 4 zone mini split features four indoor units rated equally at 12,000 BTU each with individual controllers, suited for both cooling and heating year-round. Its inverter heat pump system works in ambient temperatures from -13°F to 131°F enabling use in diverse climates. With 19 SEER2 energy efficiency, it saves up to 30% on power consumption. Additional features include self-diagnosis, auto defrost, iFEEL mode, and multiple fan speeds enhancing user comfort.
OLMO 36,000 BTU Quad 4-Zone Ductless Mini Split System

The OLMO 36,000 BTU quad zone mini split provides precise climate control with four 9,000 BTU indoor units and supports smart control via a dedicated smartphone app. Certified at 21 SEER2 efficiency, it operates on 230V power and supports heating down to -13°F. This system includes comprehensive installation kits with pre-charged copper line sets and requires professional installation. It features whisper technology for quieter operation, suitable for bedrooms and living areas.
Buying Guide For Choosing The Best 4 Zone Mini Split System
Selecting the ideal 4 zone mini split requires attention to several key factors to ensure optimal comfort, efficiency, and user convenience.
1. Cooling and Heating Capacity
Assess the total BTU requirements based on your home’s square footage and room size. Multi-zone systems often combine multiple indoor units with varying BTU ratings to match individual room needs. Ensure the outdoor unit’s capacity adequately supports all indoor units combined.
2. Energy Efficiency Ratings
Look for systems with a high SEER2 (Seasonal Energy Efficiency Ratio) and HSPF (Heating Seasonal Performance Factor) ratings. Higher ratings translate to lower energy consumption and cost savings over time. Energy Star certification is a reliable indicator of efficiency.
3. Climate Suitability
Check the operating temperature range, especially heating capabilities in colder climates. Some units offer advanced heat pump technology and defrost modes that allow effective heating in sub-zero temperatures.
4. Smart Features and Controls
Wifi connectivity, smartphone app control, and voice assistant compatibility enhance ease of use. Individual room temperature controls enable customized comfort and prevent wasted energy.
5. Installation and Maintenance
Consider the inclusion of installation kits such as copper line sets, drainage pipes, and communication wires. Professional installation is typically recommended for mini splits to ensure proper setup for reliability and warranty validation. Confirm warranty terms and support availability.
6. Noise Levels
Check product details for noise ratings, especially the indoor units if placing them in bedrooms or quiet spaces. Technologies like whisper mode reduce operational noise for better comfort.
7. Environmental Impact
Choose units using eco-friendly refrigerants like R32 and those designed to minimize global warming potential (GWP), aligning with sustainable living goals.
By balancing these considerations, you can select a 4 zone mini split system that efficiently meets your multi-room cooling and heating needs with user-friendly features and long-term savings.