When it comes to cooling and heating multiple rooms efficiently, a 4 unit mini split system offers excellent flexibility and energy savings. These systems enable individual temperature control for different zones, enhancing comfort and reducing energy consumption. Below is a comparative summary table of top 4 unit mini split systems available on Amazon, chosen for their performance, energy efficiency, and user-friendly features.
Product | Cooling Capacity (BTU) | Energy Efficiency (SEER2) | Special Features |
---|---|---|---|
Della 36K BTU Quad 4 Zone Mini Split | 36,000 (9K+9K+12K+18K) | 19 SEER2 | Alexa & WiFi Enabled, Heat Pump, Full Installation Kit |
COSTWAY 30k Quad 4 Zone Mini Split | 30,000 (9K+9K+9K+18K) | 23 SEER2 | Energy Star, R32 Refrigerant, Multiple Modes |
TOSOT 36,000BTU Quad 4 Zone Mini Split AC | 36,000 (9K+9K+9K+9K) | 21 SEER2 | WiFi Enabled, Energy Star, Extreme Weather Resilience |
ROVSUN 4 Zone 35000 BTU Mini Split AC/Heating | 35,000 (12K+12K+12K+12K) | 19 SEER2 | Heat Pump, Turbo Function, Self-Diagnosis, Sleep Mode |
KLOLKUTTA Mini Split Line Set Cover | N/A | N/A | Decorative Cover for Line Sets, Weather Protection |
Della 36K BTU Quad 4 Zone Mini Split System

The Della 36K BTU Quad 4 Zone Mini Split heats and cools up to 2350 square feet with four indoor units of varying BTUs – 9,000, 9,000, 12,000, and 18,000 respectively. Designed for multi-room use, it allows independent control of each zone, ensuring customized comfort. This system operates efficiently with a 19 SEER2 rating and supports environments as low as 5°F. Connectivity with Alexa and WiFi commands adds modern convenience. The included full installation kit and copper line sets make setup streamlined. While it does not support self-cleaning, it features a heat pump and inverter technology delivering up to 30% energy savings.
COSTWAY 30k Quad 4 Zone Mini Split Air Conditioner

The COSTWAY 30k Quad 4 Zone Mini Split offers a reliable multi-room solution with four indoor units rated 9,000, 9,000, 9,000, and 18,000 BTU. This system boasts an impressive 23 SEER2 rating and uses eco-friendly R32 refrigerant to reduce global warming potential. Designed to withstand extreme climates from -13°F to 125°F, it also integrates WiFi functionality for remote control. The system features six operation modes including heat, cool, dry, fan, sleep, and auto, alongside five adjustable wind speeds. ETL and AHRI certifications underline its quality and performance.
TOSOT 36,000BTU Quad 4 Zone Mini Split AC

The TOSOT Cosmo Series provides a versatile 36,000 BTU system with four equal indoor units of 9,000 BTU each. Its 21 SEER2 and 10 HSPF2 efficiency ratings qualify it for federal tax rebates. Each zone can be individually controlled between 61°F and 86°F for tailored comfort. The inverter-driven compressor ensures energy savings and supports operation in harsh weather, functioning in temperatures as low as -22°F. It includes an intelligent defrost feature to optimize heating and is Energy Star certified, making it a balanced system for year-round use.
ROVSUN 4 Zone 35000 BTU Mini Split AC/Heating System

The ROVSUN 35,000 BTU 4-zone mini split accommodates multiple rooms with four 12,000 BTU indoor units. The system excels with a 19 SEER2 rating and offers full year-round use with heating, cooling, dehumidifying, and fan modes. Key features include an inverter heat pump operable down to -13°F, automatic defrost, self-diagnosis, and a 24-hour timer. It supports advanced functions like turbo mode and silent operation. This mini split combines energy efficiency with enhanced user comfort and control, suitable for both residential and commercial settings.
KLOLKUTTA Mini Split Line Set Cover

While not a mini split system, the KLOLKUTTA Mini Split Line Set Cover is an essential accessory for protecting your ductless AC lines. Measuring 4 inches by 7.5 feet, it comes with multiple straight ducts for versatile configurations. Made to withstand rain, snow, and harsh outdoor elements, this cover enhances the longevity and efficiency of your line sets. Compatible with many units sized from 7,000 to 18,000 BTU, it provides a clean look while securing HVAC tubing.
Buying Guide for 4 Unit Mini Split Systems
Choosing the right 4 unit mini split system depends on several factors beyond just BTU size and price. Here are key considerations:
- Cooling and Heating Capacity: Ensure the total BTU rating of all indoor units matches the combined square footage of areas to be conditioned. Consider room insulation and sun exposure for accurate sizing.
- Energy Efficiency: Higher SEER2 ratings indicate better energy savings. Look for Energy Star-certified products to reduce electricity costs and environmental impact.
- Individual Zone Control: Ability to adjust temperature and fan speed for each indoor unit enhances comfort and reduces wasted energy.
- Climate Compatibility: Pay attention to the system’s operating temperature range. Heat pumps with low ambient heating ability perform better in colder climates.
- Smart Features: WiFi connectivity and voice assistant integration like Alexa improve usability and allow remote control.
- Installation Kit and Line Set: Systems that include installation hardware and adequate copper line lengths simplify setup and save extra costs.
- Noise Levels: Check product specs for decibel ratings to ensure quiet operation suitable for bedrooms or offices.
- Refrigerant Type: Newer refrigerants like R32 reduce global warming impact and may future-proof your investment.
- Maintenance and Cleaning: Some systems have self-diagnosis or auto-cleaning functions; while helpful, verify if these features are fully supported.
Additionally, consider accessories like line set covers to protect your outdoor piping and improve aesthetics. This can extend the life of your mini split system and preserve your home’s curb appeal.