6 Best Alternatives to the COSTWAY 28K Tri Zone 20 SEER2 Mini Split (2026)

How each alternative compares

ROVSUN 28000 BTU Tri-Zone Mini Split

The ROVSUN 28000 BTU Tri-Zone Mini Split matches the original unit’s 28,000 BTU capacity and 20 SEER2 efficiency rating. It also uses 230V power and includes Wi-Fi smart control. The main difference is the physical footprint. The ROVSUN outdoor unit is significantly larger, measuring 38.5 inches wide and 31.6 inches high, compared to the COSTWAY’s more compact dimensions. This system splits the 28,000 BTU evenly across three 9,000 BTU indoor units. You should choose this if you need balanced cooling for three equal-sized rooms and have the space for a larger outdoor condenser. It offers the same multi-zone flexibility but with a heavier build.

COSTWAY Blast Pro 18000 BTU 230V

The COSTWAY Blast Pro 18000 BTU is a single-zone unit, so it cannot replace the multi-zone capability of the original 28K system. It shares the same 20 SEER2 efficiency rating and Wi-Fi connectivity, ensuring similar energy savings and smart control features. It operates on 230V power like the original. The primary trade-off is capacity. With only 18,000 BTU, this unit is designed for one large room rather than three separate spaces. You should pick this alternative if you only need to cool a single large area and want to keep the same brand ecosystem. It offers high efficiency but sacrifices the ability to manage multiple rooms independently.

ROVSUN 12000 BTU 230V Mini Split

The ROVSUN 12000 BTU Mini Split is a single-zone system, making it unsuitable for replacing the three-zone original. It matches the 20 SEER2 efficiency rating and includes Wi-Fi smart control, aligning with your desire for energy savings and remote management. It also runs on 230V power. The key difference is the output. With 12,000 BTU, this unit is designed for smaller rooms. It is much lighter and more compact than the 28K system. You should choose this if your needs have shifted to cooling a single small room. It provides the same smart features and efficiency but with significantly lower cooling capacity, making it a budget-friendly option for smaller spaces.

TOSOT 18,000 BTU WiFi Mini Split

The TOSOT 18,000 BTU WiFi Mini Split is a single-zone unit, so it lacks the three-zone distribution of the original COSTWAY system. It shares the 20 SEER2 efficiency rating and 230V operation, ensuring comparable energy performance. It includes Wi-Fi connectivity and supports Alexa, similar to the original’s smart features. The main difference is the indoor unit size. The TOSOT indoor unit is narrower at 23.3 inches wide, which may fit better in tight wall spaces. You should pick this if you need a quieter, compact solution for a single large room. It offers the same efficiency and smart control but focuses on a single zone with a sleeker indoor design.

Della Vario 9000 BTU Mini Split

The Della Vario 9000 BTU Mini Split is a single-zone system, so it cannot provide the multi-zone coverage of the original 28K unit. It matches the 20 SEER2 efficiency rating and includes Wi-Fi and Alexa support, keeping your smart home integration intact. It operates on 230V power like the original. The primary difference is the cooling capacity. With only 9,000 BTU, this unit is intended for small rooms. It is also lighter and more compact. You should choose this if you need to cool a small space efficiently. It offers the same high efficiency and smart features but with significantly lower output, making it ideal for bedrooms or home offices rather than large living areas.

YITAHOME 12K BTU 20 SEER2 Mini Split

The YITAHOME 12K BTU 20 SEER2 Mini Split is a single-zone system, so it does not offer the three-zone flexibility of the original COSTWAY unit. It shares the 20 SEER2 efficiency rating and Wi-Fi connectivity, ensuring similar energy savings and remote control capabilities. It operates on 230V power, matching the original’s electrical requirements. The key difference is the capacity. With 12,000 BTU, this unit is designed for a single room. It is compact and lightweight. You should pick this if you only need to cool one moderate-sized room. It provides the same efficiency and smart control but sacrifices multi-zone distribution for a simpler, single-room solution.

Quick picks

Our 7 picks

1 Best overall

COSTWAY 28K Tri Zone 20 SEER2 Mini Split

Best for: large homes needing three-zone climate control

Cooling Capacity

28000 BTU

Efficiency Rating

20 SEER2

Voltage

208/230V

Number of Zones

3 Zone

Heat Pump

Heat Pump

Smart Connectivity

WiFi, Alexa, Google assistant

View on Amazon: COSTWAY 28K Tri Zone 20 SEER2 Mini Split Affiliate link

This COSTWAY unit delivers 28,000 BTU of cooling across three zones, making it suitable for larger spaces. It features a 20 SEER2 efficiency rating and operates on 208/230V power. The system includes WiFi connectivity for smart control via Alexa or Google Assistant. With a low noise level of 28 dB and extreme weather readiness, it offers stable performance for homes needing multi-zone comfort and energy savings.

Pros

• 28,000 BTU cooling capacity for larger areas
• 20 SEER2 energy efficiency rating
• Tri-zone design with 9k+9k+9k BTU distribution
• WiFi enabled with Alexa and Google Assistant support
• Quiet operation at 28 dB

Cons

• Requires professional licensed HVAC technician installation
• Heating capability limited to -4°F outdoor temperature
• No 4D swing mentioned in key specifications

Good fit if

• You need to cool three separate rooms simultaneously
• You want smart control via voice assistants
• You require a high-capacity unit for a large space

Skip if

• You only need to cool a single room
• You are looking for a DIY-friendly installation
• You need heating in sub-zero temperatures below -4°F

Verdict: COSTWAY 28K Tri Zone 20 SEER2 Mini Split is a high-capacity solution for multi-zone cooling needs. It fits buyers who prioritize energy efficiency and smart home integration over single-room simplicity.

2 Best premium

ROVSUN 28000 BTU Tri-Zone Mini Split

Best for: Cooling three equal-sized rooms

Cooling Capacity

28,000 BTU

Efficiency Rating

20 SEER2

Voltage

208-230V

Number of Zones

3 Zone

Heat Pump

Heat Pump

Smart Control

Wi-Fi

View on Amazon: ROVSUN 28000 BTU Tri-Zone Mini Split Affiliate link

The ROVSUN 28K Tri Zone Mini Split uses a 28,000 BTU outdoor condenser paired with three 9,000 BTU indoor handlers. It offers 20 SEER2 efficiency and Wi-Fi control for individual room management. The system operates on 208-230V power and includes a heat pump capable of functioning down to -4°F. This setup provides balanced cooling and heating across three separate spaces with quiet operation.

Pros

• 20 SEER2 efficiency rating for energy savings
• Wi-Fi enabled for smart control
• Three 9,000 BTU indoor units for zone control
• Heat pump operates down to -4°F
• Quiet operation between 27 and 42 dBA

Cons

• Heavier build at 179 pounds
• Larger outdoor unit dimensions
• Requires professional installation

Good fit if

• You need to cool three separate rooms
• You want individual temperature control per zone
• You require Wi-Fi connectivity for remote management

Skip if

• You only need to condition one room
• You prefer a lighter, more compact outdoor unit
• You are looking for a DIY-friendly installation

Verdict: ROVSUN 28K Tri Zone 20 SEER2 Mini Split is a practical solution for homeowners who need to manage three distinct zones with equal cooling power. It suits you if you prioritize balanced performance and smart features over a smaller physical footprint.

3 Best 1,250 sq. ft.

COSTWAY Blast Pro 18000 BTU 230V

Best for: single large rooms needing 18k BTU

Cooling Capacity

18,000 BTU

Efficiency Rating

20 SEER2

Voltage

208/230V

Coverage Area

Up to 1,250 sq ft

Heat Pump

Heat Pump

Smart Connectivity

Wi-Fi, App, Alexa, Google Assistant

View on Amazon: COSTWAY Blast Pro 18000 BTU 230V Affiliate link

This COSTWAY unit offers 18,000 BTU cooling and heating for spaces up to 1,250 square feet. It runs on 208/230V power and achieves a 20 SEER2 efficiency rating. You get smart control via Wi-Fi, app, and voice assistants. The indoor unit weighs 20.9 pounds and operates as quietly as 28 dB. It includes seven modes and 8D airflow for precise comfort.

Pros

• 20 SEER2 energy efficiency rating
• Wi-Fi and voice control support
• Quiet operation down to 28 dB
• Works with Alexa and Google Assistant

Cons

• Lower 18,000 BTU capacity than 28K alternatives
• Requires 208/230V electrical connection
• Indoor unit is 35.8 inches wide

Good fit if

• You need 18,000 BTU for a large room
• You have a 208/230V electrical circuit
• You want smart app and voice control

Skip if

• You require a 28,000 BTU tri-zone system
• You only have a standard 115V outlet
• You need multiple indoor air handlers

Verdict: COSTWAY 18K BTU 20 SEER2 Mini Split is a high-efficiency single-zone solution for large rooms. It suits users who need strong cooling and smart connectivity but do not require multi-zone distribution.

4 Also great

ROVSUN 12000 BTU 230V Mini Split

Best for: small rooms needing smart control and efficiency

Cooling Capacity

12000 BTU

Efficiency Rating

20 SEER2, 20 SEER

Voltage

230V

Coverage Area

Up to 550 sq.ft.

Heat Pump

Heat Pump

Smart Connectivity

Wi-Fi, App, Alexa, Google Assistant

View on Amazon: ROVSUN 12000 BTU 230V Mini Split Affiliate link

This ROVSUN unit offers 12,000 BTU cooling and heating for spaces up to 550 sq. ft. It runs on 230V power and achieves a 20 SEER2 efficiency rating. The system includes Wi-Fi connectivity for app and voice control via Alexa or Google Assistant. It operates quietly at 28dB in mute mode. This model suits smaller rooms where energy efficiency and smart features matter more than high capacity.

Pros

• 20 SEER2 efficiency rating for energy savings
• Wi-Fi connectivity with app and voice control
• Ultra-quiet 28dB operation in mute mode
• Heat pump functionality for year-round comfort

Cons

• 12,000 BTU capacity is lower than the 28,000 BTU alternatives
• Requires 230V electrical connection, not standard 115V
• Extra power cord is needed for installation

Good fit if

• You need efficient cooling for a single small room
• You want smart app and voice control features
• You have a 230V power outlet available

Skip if

• You need to cool a large multi-zone area
• You only have standard 115V outlets
• You require a higher 18,000 BTU or greater capacity

Verdict: ROVSUN 12000 BTU 20 SEER2 Mini Split is a solid choice for small rooms where efficiency and smart control are priorities. It fits buyers who do not need the high output of the larger 28K systems.

5 Also great

TOSOT 18,000 BTU WiFi Mini Split

Best for: single-room quiet cooling and heating

Cooling Capacity

18,000 BTU

Efficiency Rating

20 SEER2

Voltage

230V

Heat Pump

Heating System

Smart Connectivity

Wifi, Alexa, GREE+ app

Smart Control

Wi-Fi, Alexa

View on Amazon: TOSOT 18,000 BTU WiFi Mini Split Affiliate link

This TOSOT unit offers 18,000 BTU cooling and heating with a 20 SEER2 efficiency rating. It operates on 230V power and includes Wi-Fi control via the GREE+ app. The indoor unit measures 23.3 inches wide and runs as quietly as 22dB. It comes with a 16 ft copper line set. This model suits single-room applications where smart scheduling and quiet operation are priorities.

Pros

• 20 SEER2 inverter compressor for energy efficiency
• Wi-Fi control via GREE+ app and voice assistants
• Quiet operation down to 22dB
• Includes 16 ft copper line set

Cons

• Lower capacity than the 28K units on this list
• Single-zone configuration only
• Requires professional installation

Good fit if

• You need a quiet unit for a bedroom
• You want app-based scheduling for a single room
• You prefer 230V electrical connections

Skip if

• You require a tri-zone system for multiple rooms
• You need more than 18,000 BTU of cooling power
• You are looking for a 115V plug-in model

Verdict: TOSOT 18K BTU WiFi Mini Split is a solid single-room solution for users prioritizing quiet operation and smart controls over high capacity. It fits well in bedrooms or offices where 18,000 BTU is sufficient.

6 Also great

Della Vario 9000 BTU Mini Split

Best for: Small rooms needing quiet, efficient cooling

Cooling Capacity

9,000 BTU (0.75 Ton)

Efficiency Rating

20 SEER2

Voltage

208-230V

Coverage Area

Up to 400 sq ft

Heat Pump

Heat Pump

Smart Connectivity

Wi-Fi, Alexa, DELLA app

View on Amazon: Della Vario 9000 BTU Mini Split Affiliate link

This Della Vario unit offers 9,000 BTU of cooling for spaces up to 400 square feet. It runs on 208-230V and achieves a 20 SEER2 efficiency rating. The system includes a heat pump that operates in temperatures down to -4 degrees Fahrenheit. You get smart control via WiFi and Alexa, plus a remote with an ambient temperature sensor. It is a solid option for small rooms where energy efficiency and quiet operation matter.

Pros

• 20 SEER2 efficiency rating for lower energy use
• Ultra-quiet operation at just 29 dBA
• Remote control senses room temperature for better comfort
• Works with Alexa and WiFi app control

Cons

• 9,000 BTU capacity is too small for larger rooms
• Requires professional installation and line-set vacuuming
• Heating performance drops significantly below 0 degrees Fahrenheit

Good fit if

• You need to cool a small room under 400 square feet
• You want a quiet unit for a bedroom or office
• You already use Alexa for smart home control

Skip if

• You need to cool a space larger than 400 square feet
• You are looking for a multi-zone system for multiple rooms
• You require a 115V plug-in unit without hardwiring

Verdict: Della Vario 9000 BTU 20 SEER2 is a compact, efficient choice for small spaces. It suits you if you prioritize quiet operation and smart features over raw cooling power.

7 Best budget

YITAHOME 12K BTU 20 SEER2 Mini Split

Best for: Single-room cooling with smart control

Cooling Capacity

12000 BTU

Efficiency Rating

20 SEER2

Voltage

208-230V

Coverage Area

Up to 750 sq ft

Heat Pump

Heat Pump

Smart Control

Wi-Fi

View on Amazon: YITAHOME 12K BTU 20 SEER2 Mini Split Affiliate link

This YITAHOME unit delivers 12,000 BTU of cooling and heating with a 20 SEER2 efficiency rating. It operates on 208-230V power and covers spaces up to 750 square feet. The system includes Wi-Fi connectivity for remote control and six operating modes. It runs quietly at 25 dB in sleep mode and handles temperatures from -4°F to 122°F. This model suits single-room comfort needs rather than multi-zone setups.

Pros

• 20 SEER2 energy efficiency rating
• Wi-Fi smart control capability
• Quiet 25 dB sleep mode operation
• Wide operating temperature range of -4°F to 122°F
• Six operating modes including auto and eco

Cons

• 12,000 BTU capacity is too small for large areas
• Single-zone design lacks multi-zone flexibility
• 208-230V voltage requires compatible electrical setup

Good fit if

• You need efficient cooling for a single room under 750 sq. ft.
• You want Wi-Fi control for remote temperature management
• You require quiet operation in noise-sensitive spaces

Skip if

• You need to cool multiple rooms simultaneously
• Your space exceeds 750 square feet
• You require 115V standard household power only

Verdict: YITAHOME 12K BTU 20 SEER2 Mini Split is a strong option for single-room comfort seekers who value quiet operation and smart controls. It fits users with compatible 208-230V power and moderate space requirements.

Specifications side by side

Frequently asked questions