If you’re looking for a versatile and energy-efficient way to cool and heat multiple rooms, a DIY multi zone mini split system is an excellent choice. These ductless units empower you to control temperatures in different spaces independently, optimizing comfort and reducing energy consumption. We’ve selected the top 5 mini split systems that balance performance, ease of installation, and smart controls, perfect for American homes and small businesses.
| Product | BTU & Zones | Smart Features | Coverage Area |
|---|---|---|---|
| DELLA 18K BTU Dual Zone Mini Split | 18,000 BTU / 2 Zones (9K + 9K) | WiFi, Alexa compatible | Up to 800 Sq.Ft |
| COSTWAY 18K Dual 2 Zone Mini Split AC | 18,000 BTU / 2 Zones (9K + 12K) | WiFi Enabled | Not specified |
| DELLA 36K BTU Quad 4 Zone Mini Split | 36,000 BTU / 4 Zones (9K, 9K, 12K, 18K) | WiFi, Alexa compatible | Up to 2350 Sq.Ft |
| DELLA 27K BTU Tri 3 Zone Mini Split | 27,000 BTU / 3 Zones (9K, 9K, 18K) | WiFi, Alexa compatible | Up to 1800 Sq.Ft |
| ROVSUN 28K Tri Zone WIFI Mini Split | 28,000 BTU / 3 Zones (9K, 9K, 12K) | WiFi Enabled | Not specified |
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DELLA 18K BTU Dual Zone Mini Split Air Conditioner
The DELLA 18K BTU ODU 2 Dual Zone Mini Split offers efficient cooling and heating using DC Inverter technology with a solid SEER2 rating of 19. This unit supports two zones with individual 9,000 BTU indoor handlers, giving each room its own climate control. It covers up to 800 square feet overall and performs well in temperatures as low as 5°F. The system includes 16-foot copper piping and installation kits for easier setup. Although it is pre-charged and ETL and AHRI certified, note that the self-cleaning function is not operational despite appearing on the display. It also integrates seamlessly with Alexa for voice control and home automation compatibility.
COSTWAY 18K Dual 2 Zone Mini Split Air Conditioner
The COSTWAY 18K BTU Dual 2 Zone Mini Split is designed with multi-room flexibility providing two zones at 9,000 and 12,000 BTUs respectively. It uses advanced inverter technology boasting an excellent 22 SEER2 and 10 HSPF2, maximizing energy efficiency. This system features environmentally friendly R32 refrigerant with a low global warming potential and is certified by ETL and AHRI. It supports six modes including auto, cool, heat, dry, fan, and sleep, and five adjustable wind speeds. Additionally, its outdoor unit operates reliably in climates ranging from -13°F to 125°F.
DELLA 36K BTU Quad 4 Zone Mini Split Air Conditioner
The DELLA 36K BTU Quad Zone Mini Split covers a large area up to 2,350 square feet with four indoor air handlers providing multi-zone comfort (two 9K, one 12K, one 18K BTU). It maintains a 19 SEER2 rating, ETL and AHRI certification, ensuring energy-efficient cooling and heating. The unit supports operation in cold environments down to 5°F and includes extensive installation kits with copper pipes and drain pipes. The system is compatible with Alexa and WiFi, providing smart home integration. Like other Della models, it does not support the self-cleaning function.
DELLA 27K BTU Tri 3 Zone Mini Split AC
This DELLA 27K BTU Tri Zone Mini Split allows you to cool and heat up to 1,800 square feet divided between three zones (two 9K and one 18K BTU handlers). It features the same inverter plus DC technology and heat pump specifications seen in other Della models, rated at 19 SEER2 for energy-saving operation. The system maintains quiet operation and quick temperature adjustments between 60-90°F. It comes with all necessary installation materials but requires professional installation due to line-set vacuuming and refrigerant adjustments.
ROVSUN 28K BTU Tri Zone WIFI Mini Split AC
The ROVSUN 28000 BTU Tri Zone Mini Split features a powerful outdoor condenser with three indoor air handlers sized 9K, 9K, and 12K BTU. It offers a full range of seasonal comfort options including air conditioning, heat pump heating, dehumidifying, and fan modes. The unit supports WiFi control and individual room temperature settings. With a 20 SEER2 rating and ETL/AHRI certification, this model balances performance and energy savings, delivering reliable operation as cold as -13°F. Additional features include auto-defrost, self-diagnosis, and turbo function for rapid comfort.
Buying Guide For DIY Multi Zone Mini Split Systems
Selecting the right multi zone mini split system involves several key considerations to ensure optimal comfort, energy efficiency, and ease of installation:
- Number of Zones and BTU Capacity: Determine how many rooms you want to condition and calculate total cooling/heating load. Each indoor air handler should have proper BTU sizing for the room’s square footage to maximize efficiency.
- Energy Efficiency Ratings: Look for high SEER2 (Seasonal Energy Efficiency Ratio) and HSPF2 (Heating Seasonal Performance Factor) ratings. Higher ratings translate to lower electricity use and operational costs.
- Smart Controls and Connectivity: Systems with WiFi and voice assistant compatibility (Alexa, Google Assistant) offer convenient remote control and integration with smart home setups.
- Installation Requirements: Even DIY kits may require technical skills, especially for refrigerant line handling and vacuuming. Some models may mandate professional installation for safety and warranty.
- Operating Temperature Range: Consider climate zone requirements; models rated for low ambient temperatures (-4°F or below) offer reliable heating in colder regions.
- Included Accessories: Verify what installation kits, copper lines, drain pipes, and mounting hardware come with the unit to avoid extra costs.
- Noise Levels: Quiet operation enhances comfort, particularly for bedrooms and living areas. Look for units with noise levels around or below 50 dBA.
- Refrigerant Type: Prefer models using eco-friendly refrigerants like R32 for environmental benefits and compliance with future regulations.
Evaluating these factors carefully will help you choose the best DIY multi zone mini split system tailored to your home’s cooling and heating needs while optimizing energy use and installation convenience.