Finding the perfect mini split air conditioner that can efficiently cool or heat multiple rooms is essential for comfort and energy savings in your home or office. This guide reviews some of the best multi-zone mini split AC units designed to cover various square footages while offering individual room control, energy-efficient technology, and convenient smart features.
| Product Name | Brand | BTU Capacity | Zones | SEER Rating | Cooling Area |
|---|---|---|---|---|---|
| Della Mini Split Air Conditioner ODU Tri 3 Zone | Della | 27,000 BTU (9K+9K+12K) | 3 | 19 SEER2 | Up to 1350 Sq.Ft |
| DELLA 18K BTU ODU 2 Dual Zone Mini Split AC | Della | 18,000 BTU (9K+9K) | 2 | 19 SEER2 | Up to 800 Sq.Ft |
| COSTWAY 18k Dual 2 Zone Mini Split Air Conditioner | COSTWAY | 24,000 BTU (12K+12K) | 2 | 22 SEER2 | Varies per room |
| Della 36K BTU Quad 4 Zone Mini Split | Della | 36,000 BTU (9K+9K+12K+18K) | 4 | 19 SEER2 | Up to 2350 Sq.Ft |
| COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner | COSTWAY | 30,000 BTU (9K+9K+9K+18K) | 4 | 23 SEER2 | Varies per room |
Content Navigation
- Della Mini Split Air Conditioner ODU Tri 3 Zone 27K BTU
- DELLA 18K BTU ODU 2 Dual Zone Mini Split AC with Wifi
- COSTWAY 18k Dual 2 Zone Mini Split Air Conditioner
- Della 36K BTU Quad 4 Zone Mini Split Air Conditioner
- COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner
- Buying Guide for Mini Split AC Systems for Multiple Rooms
Della Mini Split Air Conditioner ODU Tri 3 Zone 27K BTU
The Della 3 Zone 27,000 BTU mini split system is designed to cool up to 1350 square feet with three indoor air handlers (9000 BTU, 9000 BTU, and 12,000 BTU). It features DC inverter technology and a heat pump capable of operating in temperatures as low as -4℉ (-20℃). This ensures energy-efficient heating and cooling year-round. The system supports individual thermostatic control for each zone, ideal for tailoring comfort preferences in multiple rooms.
- 19 SEER2 rating for energy savings up to 30%
- Includes 3 copper pipe linesets and drain pipe kits for installation
- Multiple smart modes: turbo, 4D airflow, sleep, eco, dry, and timer features
- Compatible with Alexa for easy voice and app control
- Max fuse size 20A and ETL/AHRI certified for safety and efficiency
DELLA 18K BTU ODU 2 Dual Zone Mini Split AC with Wifi
This Della 2 Zone 18,000 BTU mini split offers a flexible cooling and heating solution for up to 800 square feet with two 9000 BTU indoor units. Featuring advanced inverter technology, it provides up to 30% energy savings and works in cold climates down to 5°F. Each room enjoys separate temperature control for customized comfort.
- Pre-charged heat pump system with DC inverter
- 19 SEER2 energy efficiency rating
- Included 16ft copper pipes and drain pipe for professional installation
- Supports Alexa voice control and Wifi connectivity
- ETL and AHRI certified ensuring high standards and safety
COSTWAY 18k Dual 2 Zone Mini Split Air Conditioner
The COSTWAY 18k Dual Zone Mini Split unit is an energy star certified, ductless AC featuring 12000 BTU + 12000 BTU zones with independent temperature control. It has an impressive 22 SEER2 rating and uses R32 refrigerant, offering a greener, more environmentally friendly cooling solution. It supports a wide temperature range (-13℉ to 125℉) thanks to its chassis heating function.
- Multiple operating modes: auto, cool, heat, dry, fan, sleep
- Five fan speed options with auto swing for consistent airflow
- ETL and AHRI certifications for quality assurance
- Ideal for multi-room homes requiring sustainable and efficient cooling
Della 36K BTU Quad 4 Zone Mini Split Air Conditioner
The Della 36K BTU Quad Zone mini split system is designed to cool up to 2350 square feet. It comes with four indoor air handlers sized 9000, 9000, 12000, and 18000 BTU. Perfect for larger homes or multi-room setups, it features a heat pump for year-round heating and cooling and supports individual room temperature control via separate controllers.
- 19 SEER2 efficiency rating; up to 30% energy savings
- Works in environments as low as 5°F
- Installation kits included for all four zones
- Compatible with Alexa and Wifi for smart home integration
- ETL and AHRI certified for guaranteed safety and performance
COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner
The COSTWAY 30K BTU Quad Zone mini split AC offers four zones with capacities of 9000, 9000, 9000, and 18000 BTU, suitable for diverse room sizes and heating/cooling demands. It boasts a high 23 SEER2 rating and uses the environmentally friendly R32 refrigerant. This ductless system supports six modes and five fan speeds for maximum versatility.
- Energy Star certified and ETL/AHRI approved
- Advanced inverter technology provides up to 30% energy savings
- Chassis heating supports operation at -13℉ to 125℉ ambient temperatures
- WiFi enabled for remote control and scheduling
Buying Guide for Mini Split AC Systems for Multiple Rooms
Choosing the best mini split air conditioner for multiple rooms involves several considerations to ensure you select the ideal system for your space, budget, and comfort needs.
Cooling and Heating Capacity (BTU)
BTU capacity determines the amount of heat the unit can remove or add. Calculate the total square footage of the areas you want to condition and multiply by an estimated BTU per square foot (usually 20-30 BTU/ft² depending on insulation and climate). Multi-zone systems split total BTU across indoor units, so make sure each zone is appropriately sized for its room.
Number of Zones (Indoor Units)
Each “zone” corresponds to an indoor air handler placed in a room or zone you want to control independently. Systems range from two to four zones or more. More zones allow for customized comfort settings per room but increase installation complexity and cost.
Energy Efficiency (SEER Rating)
A higher SEER rating means better energy efficiency, translating to lower electricity usage. Modern inverter-driven mini splits often boast ratings above 19 SEER, with some models reaching 22 or 23 SEER2. Look for ETL and AHRI certifications to ensure efficiency claims are verified.
Installation Components and Kits
Most mini splits come pre-charged with refrigerant and include copper piping, drain tubes, and mounting hardware, but verify the included accessories match your installation needs. Professional installation is recommended to maintain warranty and ensure proper setup.
Feature Set and Controls
Consider smart features like WiFi connectivity, voice assistant compatibility (Alexa), and app controls that enhance convenience. Multi-mode operation (cool, heat, dry, fan, sleep) adds versatility. Features like turbo mode, air swing, sleep timer, and silent operation contribute to improved comfort.
Climate Adaptability
If you live in an area with extreme temperatures, check the heat pump’s operating range to ensure reliable heating during cold months and efficient cooling during heat waves.
Environmentally Friendly Refrigerants
Refrigerants like R32 have lower global warming potential (GWP) compared to older refrigerants, reducing environmental impact. Look for Energy Star-certified models using greener refrigerants.
Budget and Warranty
Multi-zone mini splits are a significant investment. Balancing capacity, features, and energy savings will help select an option offering the best value. Check warranty terms to ensure long-term peace of mind.