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The COSTWAY 28K Tri Zone 20 SEER2 Mini Split handles multi-room comfort with a 28,000 BTU capacity and 20 SEER2 efficiency. It offers zoned control for larger spaces and operates reliably in extreme temperatures. If you are searching for costway 28k tri zone 20 alternatives, you may need a different configuration or voltage setup. This unit requires 208-230V power and a tri-zone design that might not fit every home layout.
We selected these 6 options because their specifications overlap with the original product. Some alternatives provide single-zone coverage for smaller rooms or standard 115V outlets. Others offer different BTU outputs or slightly varied efficiency ratings like 19 SEER2. You can choose based on your specific voltage availability, room size, and desired smart features. Each option delivers heating and cooling with Wi-Fi control, allowing you to compare practical specs rather than marketing claims.
How these units compare to the COSTWAY
COSTWAY Blast Pro 18000 BTU 230V
The COSTWAY Blast Pro focuses on single large rooms rather than multi-zone setups. It delivers 18,000 BTUs with 20 SEER2 efficiency, matching the original’s energy rating but in a single unit. It requires 208-230V power, similar to the tri-zone model. This option is better if you need strong coverage for one big space without the complexity of three zones. You lose the ability to control temperatures in separate rooms, but gain a simpler installation for a single area. It is ideal for large rooms where zoned control is unnecessary.
Rellytech 12000 BTU 20 SEER2 Mini Split
The Rellytech 12,000 BTU unit is designed for smaller spaces up to 750 square feet. It runs on standard 115V outlets, which makes it easier to install in homes without dedicated 208-230V circuits. While it has the same 20 SEER2 efficiency rating, its cooling capacity is much lower than the 28,000 BTU original. You give up multi-zone comfort and high power output. This alternative is best for small rooms or apartments where a full multi-zone system is overkill. It offers efficient cooling for modest spaces without requiring specialized electrical infrastructure.
Mountman 12000 BTU 19 SEER2 Mini Split
The Mountman 12,000 BTU model offers 19 SEER2 efficiency, slightly lower than the original’s 20 SEER2 rating. It is sized for medium rooms up to 750 square feet and uses 208-230V power. Unlike the tri-zone system, this is a single-zone unit focused on one area. It provides smart control via Wi-Fi and app, similar to the original. You trade significant cooling capacity and multi-room flexibility for a more compact solution. This choice suits buyers who need smart features and moderate cooling for a bedroom or office, rather than whole-home zoned comfort.
YITAHOME 12000 BTU 115V Mini Split
The YITAHOME 12,000 BTU unit operates on standard 115V outlets, making it accessible for homes without 208-230V wiring. It matches the original’s 20 SEER2 efficiency rating but provides only 12,000 BTUs. This single-zone system is better for small rooms up to 750 square feet. You lose the multi-zone capability and high capacity of the COSTWAY tri-zone model. However, you gain easier electrical compatibility and smart voice control features. This alternative is ideal for users who need efficient cooling for a single small space without the complexity or power requirements of a larger multi-zone system.
Temprium 18,000 BTU Mini Split AC
The Temprium 18,000 BTU model is a single-zone unit designed for large rooms up to 1,250 square feet. It uses 230V power and offers 20 SEER2 efficiency, matching the original’s energy rating. Unlike the tri-zone system, it does not allow room-by-room temperature control. It focuses on quiet performance for dedicated cooling and heating in one area. You give up multi-zone flexibility for a simpler, powerful single unit. This option is best for users who need strong efficiency and coverage for one large room, rather than managing multiple zones throughout a home.
Della Vario 9000 BTU Mini Split
The Della Vario 9,000 BTU unit is designed for small rooms where quiet, efficient cooling is the priority. It runs on 230V power and offers 20 SEER2 efficiency, matching the original’s energy rating. However, its capacity is significantly lower at 9,000 BTUs. This single-zone system lacks the multi-zone capability of the COSTWAY tri-zone model. It is ideal for users who value low energy use and smart voice control over high power output. You trade extensive cooling power and room-by-room control for a compact, efficient unit suitable for smaller spaces.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | COSTWAY 28K Tri Zone 20 SEER2 Mini Split Best overall | Multi-room cooling and heating needs | |
| 2 | COSTWAY Blast Pro 18000 BTU 230V Best premium | Large rooms with 208-230V power | |
| 3 | Rellytech 12000 BTU 20 SEER2 Mini Split Best budget | small rooms with 115V outlets | |
| 4 | Mountman 12000 BTU 19 SEER2 Mini Split Best 19 seer2 | medium rooms needing smart control | |
| 5 | YITAHOME 12000 BTU 115V Mini Split Best cover | small rooms with standard 115V outlets | |
| 6 | Temprium 18,000 BTU Mini Split AC Also great | large rooms with 230V power | |
| 7 | Della Vario 9000 BTU Mini Split Also great | small rooms needing quiet, efficient cooling |
COSTWAY 28K Tri Zone 20 SEER2 Mini Split
Best for: Multi-room cooling and heating needs
- Cooling Capacity
- 28000 BTU
- SEER2 Rating
- 20 SEER2
- Voltage
- 208/230V
- Number of Zones
- Tri 3 Zone
- Smart Compatibility
- WiFi, Alexa, Google assistant, remote
- Operating Modes
- auto, cool, heat, dry, fan, ECO, sleep
This multi-zone mini split delivers 28,000 BTU total cooling and heating across three rooms. It features a 20 SEER2 rating and Wi-Fi control for energy efficiency and remote management. The outdoor unit operates reliably in temperatures from -4°F to 127°F. With 28 dB noise levels and a 4D swing, it suits larger homes needing zoned comfort. You get precise temperature control for each zone without sacrificing energy savings.
- 28,000 BTU total capacity across three zones
- 20 SEER2 energy efficiency rating
- Wi-Fi enabled with Alexa and Google Assistant support
- Operates in extreme heat (127°F) and cold (-4°F)
- Quiet operation at 28 dB
- Requires professional licensed HVAC technician installation
- Larger physical footprint with a 31.9-inch width
- Higher voltage requirement of 208-230V
- You need to cool or heat three separate rooms simultaneously
- You want a high-capacity unit with strong weather tolerance
- You prefer smart home integration via Wi-Fi
- You only need to condition a single small room
- You require a standard 115V electrical connection
- You prefer a DIY installation without professional help
Verdict: COSTWAY 28K Tri Zone Mini Split is the right choice for homeowners who need powerful, zoned climate control for larger spaces and have the proper electrical setup. It balances high capacity with energy efficiency, making it ideal for multi-room comfort.
COSTWAY Blast Pro 18000 BTU 230V
Best for: Large rooms with 208-230V power
- Cooling Capacity
- 18000 BTU
- Coverage Area
- Up to 1250 sq ft
- SEER2 Rating
- 20 SEER2
- Voltage
- 208/230V
- Smart Compatibility
- Alexa, Google Assistant, Wi-Fi, remote
- Operating Modes
- Auto, cool, heat, dry, fan, ECO, sleep
The COSTWAY 18000 BTU mini split offers 20 SEER2 efficiency and covers up to 1,250 sq. ft. It operates on 208-230V and includes Wi-Fi control with Alexa compatibility. The unit features 4D airflow, seven modes, and runs as low as 28 dB. It is a solid choice for medium-to-large rooms needing reliable heating and cooling with smart integration.
- 20 SEER2 energy efficiency rating
- Covers up to 1,250 sq. ft.
- Wi-Fi and Alexa voice control
- Quiet operation down to 28 dB
- Heats effectively at -4°F
- Lower 18000 BTU capacity than the 28000 BTU top pick
- Requires 208-230V hardwired connection
- Heavier 20.9 lb indoor unit
- You need a 208-230V unit for a 1250 sq. ft. space
- You want smart control via Alexa or Wi-Fi
- You prioritize quiet 28 dB indoor operation
- You only have a standard 115V outlet
- You need more than 18000 BTU of cooling power
- You prefer a lighter indoor unit under 20 lbs
Verdict: COSTWAY 18K BTU Mini Split 20 SEER2 fits users with 208-230V power who need strong coverage for large rooms without excessive noise.
Rellytech 12000 BTU 20 SEER2 Mini Split
Best for: small rooms with 115V outlets
- Cooling Capacity
- 12,000 BTU
- Coverage Area
- up to 750 sq ft
- SEER2 Rating
- 20
- Voltage
- 110V/115V
- Smart Compatibility
- Wi-Fi, voice commands, remote
- Operating Modes
- cooling, heat pump, dry, fan-only, eco
The Rellytech 12000 BTU mini split offers 20 SEER2 efficiency on a 115V circuit. It cools and heats spaces up to 750 square feet using R454B refrigerant. You get Wi-Fi control and a remote with a display. The unit operates quietly and handles temperatures from -13°F to 122°F. This model fits well in smaller rooms or areas with standard electrical outlets.
- 20 SEER2 energy efficiency rating
- Works on standard 115V power
- Wi-Fi and app control included
- Operates in temperatures from -13°F to 122°F
- 12000 BTU capacity is lower than 18000 or 28000 BTU options
- 115V voltage limits use in some high-power circuits
- 750 square foot coverage is smaller than larger units
- You need a unit for a room up to 750 square feet
- You have a standard 115V electrical outlet available
- You want Wi-Fi control for a smaller space
- You need to cool a large open area over 750 square feet
- Your electrical system only supports 230V circuits
- You require higher BTU output for extreme heat loads
Verdict: Rellytech 12000 BTU Mini Split AC is a practical choice for homeowners with standard 115V outlets who need efficient cooling for smaller rooms up to 750 square feet.
Mountman 12000 BTU 19 SEER2 Mini Split
Best for: medium rooms needing smart control
- Cooling Capacity
- 12000 BTU
- Coverage Area
- Up to 750 sq ft
- SEER2 Rating
- 19 SEER2
- Voltage
- 208/230V
- Smart Compatibility
- Wi-Fi, Alexa, remote control
- Operating Modes
- Cool, Heat, Dry, Fan
This Mountman mini split delivers 12,000 BTU of cooling and heating for spaces up to 750 square feet. It operates on 208-230V power with a 19 SEER2 rating. The unit includes built-in WiFi and Alexa compatibility for remote control. You get four fan speeds and specialized modes like sleep and turbo boost. It is a solid option for medium-sized rooms where moderate efficiency and smart control matter more than top-tier ratings.
- 19 SEER2 energy efficiency rating
- Built-in WiFi and Alexa compatibility
- Covers up to 750 square feet
- Ultra-quiet 26dB sleep mode operation
- Rapid cooling with turbo boost function
- 19 SEER2 rating is lower than the 20 SEER2 found on other list options
- 12,000 BTU capacity is less powerful than the 18,000 or 28,000 BTU units on the list
- 750 square feet coverage is smaller than the larger capacity alternatives
- You need a 12,000 BTU unit for a medium room
- You want built-in WiFi control without extra accessories
- You are comfortable with a 19 SEER2 efficiency rating
- You require the highest 20 SEER2 efficiency rating available
- You need to cool a large space over 750 square feet
- You want a higher 18,000 or 28,000 BTU capacity
Verdict: Mountman 12000 BTU Mini Split fits buyers who prioritize smart home integration and moderate cooling power for a standard bedroom or office. It is a practical choice for those who do not need the maximum efficiency or capacity of larger units.
YITAHOME 12000 BTU 115V Mini Split
Best for: small rooms with standard 115V outlets
- Cooling Capacity
- 12,000 BTU
- Coverage Area
- 750 sq ft
- SEER2 Rating
- 20
- Voltage
- 115V
- Smart Compatibility
- Alexa, Wi-Fi, remote
- Operating Modes
- Auto, Cooling, Drying, Heating, Fan
The YITAHOME 12000 BTU Mini Split AC offers 20 SEER2 efficiency with 115V compatibility. It covers 750 sq. ft. and includes WiFi and Alexa control. The system operates quietly under 41 dB and handles temperatures from 5°F to 118°F. You get five modes and four fan speeds. This unit suits smaller spaces needing reliable heating and cooling without complex installation.
- 20 SEER2 energy efficiency rating
- 115V voltage compatibility
- WiFi and Alexa voice control
- Operates under 41 dB noise level
- Covers up to 750 sq. ft.
- Lower 12000 BTU capacity compared to 18000 and 28000 BTU alternatives
- Heavier 22-pound indoor unit compared to lighter competitors
- Smaller 750 sq. ft. coverage area than larger models
- You need a 115V compatible unit for standard outlets
- You want WiFi control without extra hubs
- You are cooling a room under 750 sq. ft.
- You require heating in temperatures below 5°F
- You need to cool a space larger than 750 sq. ft.
- You prefer a 208-230V dedicated circuit system
Verdict: YITAHOME 12000 BTU Mini Split AC fits users with standard 115V outlets who need efficient cooling for small rooms. It delivers solid SEER2 performance and smart features for modest spaces.
Temprium 18,000 BTU Mini Split AC
Best for: large rooms with 230V power
- Cooling Capacity
- 18000 BTU
- Coverage Area
- Up to 1250 sq ft
- SEER2 Rating
- 20 SEER2
- Voltage
- 230V
- Operating Modes
- Auto, Cool, Heat, Dry, Fan, Sleep, ECO
- Features
- Quiet Operation
This Temprium unit delivers 18,000 BTU of cooling and heating for spaces up to 1,250 square feet. It runs on 230V power with a 20 SEER2 efficiency rating. The system includes WiFi control and operates quietly at 28 dB. It is a practical choice for larger rooms or open areas where you need reliable year-round comfort without central HVAC extensions.
- 20 SEER2 energy efficiency rating
- Covers up to 1,250 square feet
- Quiet operation at 28 dB
- WiFi and app control included
- Requires 230V electrical connection
- Heavier at 40.8 pounds
- Limited to 7 operating modes
- You have a 230V outlet available
- You need to cool a large room
- You value quiet nighttime operation
- You only have 115V outlets
- You need multi-zone control
- You want more than 7 modes
Verdict: Temprium 18000 BTU 230V Mini Split is a solid option for single large rooms with the right voltage. It offers strong efficiency and quiet performance for those who need dedicated cooling and heating.
Della Vario 9000 BTU Mini Split
Best for: small rooms needing quiet, efficient cooling
- Cooling Capacity
- 9000 BTU
- Coverage Area
- Up to 400 Sq. Ft
- SEER2 Rating
- 20 SEER2
- Voltage
- 208-230V
- Smart Compatibility
- Alexa, Wi-Fi app, remote control
- Operating Modes
- Heating, cooling, dry
This 9,000 BTU unit covers up to 400 square feet with 20 SEER2 efficiency. It operates on 230V and includes WiFi and Alexa compatibility for remote control. The system features a DC inverter for power savings and ultra-quiet 29 dBa operation. It is designed for small rooms where precise temperature control and energy efficiency matter more than raw cooling power.
- 20 SEER2 energy efficiency rating
- Ultra-quiet 29 dBa operation
- Works with Alexa and WiFi app
- Covers up to 400 square feet
- Lower 9,000 BTU capacity than most alternatives
- Heavier 19.8-pound indoor unit
- Requires professional installation only
- You need cooling for a small room under 400 sq ft
- You want quiet operation for a bedroom
- You prefer 230V efficiency over 115V convenience
- You need to cool a large open space
- You want a DIY installation without a pro
- You require higher BTU output for hot climates
Verdict: Della 9000 BTU Mini Split fits small rooms where quiet, efficient cooling is priority. It suits users who value smart features and low energy use over high power output.
Specifications side by side
| Spec | COSTWAY 28K Tri Zone 20 SEER2 Mini Split | COSTWAY Blast Pro 18000 BTU 230V | Rellytech 12000 BTU 20 SEER2 Mini Split | Mountman 12000 BTU 19 SEER2 Mini Split | YITAHOME 12000 BTU 115V Mini Split | Temprium 18,000 BTU Mini Split AC | Della Vario 9000 BTU Mini Split |
|---|---|---|---|---|---|---|---|
| Cooling Capacity | 28000 BTU | 18000 BTU | 12,000 BTU | 12000 BTU | 12,000 BTU | 18000 BTU | 9000 BTU |
| Coverage Area | – | Up to 1250 sq ft | up to 750 sq ft | Up to 750 sq ft | 750 sq ft | Up to 1250 sq ft | Up to 400 Sq. Ft |
| SEER2 Rating | 20 SEER2 | 20 SEER2 | 20 | 19 SEER2 | 20 | 20 SEER2 | 20 SEER2 |
| Voltage | 208/230V | 208/230V | 110V/115V | 208/230V | 115V | 230V | 208-230V |
| Number of Zones | Tri 3 Zone | – | – | – | – | – | – |
| Smart Compatibility | WiFi, Alexa, Google assistant, remote | Alexa, Google Assistant, Wi-Fi, remote | Wi-Fi, voice commands, remote | Wi-Fi, Alexa, remote control | Alexa, Wi-Fi, remote | – | Alexa, Wi-Fi app, remote control |
| Operating Modes | auto, cool, heat, dry, fan, ECO, sleep | Auto, cool, heat, dry, fan, ECO, sleep | cooling, heat pump, dry, fan-only, eco | Cool, Heat, Dry, Fan | Auto, Cooling, Drying, Heating, Fan | Auto, Cool, Heat, Dry, Fan, Sleep, ECO | Heating, cooling, dry |
| Features | – | Inverter | Inverter, Quiet Operation | Inverter | Inverter, Cover | Quiet Operation | Inverter |
| Control Method | Wi-Fi, Wi-Fi App Control, Wi-Fi App | Wi-Fi, Wi-Fi App Control, Wi-Fi App, Voice Control | Wi-Fi, Wi-Fi App Control, Wi-Fi App | Wi-Fi, Wi-Fi App Control, Wi-Fi App | Wi-Fi, Wi-Fi App Control, Wi-Fi App, Voice Control | Wi-Fi, Wi-Fi App Control, Wi-Fi App | Wi-Fi, Wi-Fi App Control, Wi-Fi App, Voice Control |
| Color | White | White | White | White | White | White | White |
| Operating Mode | Heater | Heater | Heater | Heater | Heater | Heater | Heater |
| SEER Rating | 20 SEER2 | 20 SEER2 | 20 SEER2 | 19 SEER2 | 20 SEER2 | 20 SEER2 | 20 SEER2 |
| Dimensions | 7.48 × 31.9 × 12.1 inches | 7.68 × 35.8 × 12 inches | 8.66 × 31.9 × 11.4 inches | 8.23 × 32.3 × 11.9 inches | 7.9 × 31.2 × 11.5 inches | 8.74 × 37.8 × 12.4 inches | 8 × 31.9 × 11.5 inches |
| Weight | – | 20.9 pounds | 75.3 pounds | 70.4 pounds | 22 pounds | 40.8 pounds | 19.8 pounds |
| Size | Tri(3) Zone 9k+9k+9k BTU | – | 12000BTU,115V,20 SEER2-WiFi | – | – | 18,000 BTU, 230V, 20 SEER2 | 9,000 BTU – 230V / 20 SEER2 |
| Model | – | Blast Pro | CE0-1 | MM-HWF12-230 | MAYIH4qu0k | SAC002-A-18KWH-US | TL-9K2VB-20S-I+O |
Frequently asked questions
What is the best alternative to the COSTWAY 28K Tri Zone 20 for multi-room setups?
The top-ranked alternative is the COSTWAY 28K Tri Zone 20 SEER2 Mini Split itself, which serves as the best overall choice. It provides tri-zone capacity with 9k+9k+9k BTUs across three indoor units. This configuration allows for independent climate control in multiple rooms, making it ideal for larger homes requiring zoned comfort.
Which mini split is best for large rooms requiring 230V power?
The COSTWAY Blast Pro 18000 BTU 230V is the best premium option for large spaces. It covers up to 1,250 square feet and operates on 208-230V power. With 20 SEER2 efficiency and inverter technology, it delivers strong cooling performance while maintaining quiet operation for bedrooms or living areas.
Are there efficient mini splits that work with standard 115V outlets?
Yes, the Rellytech 12000 BTU 20 SEER2 Mini Split and YITAHOME 12000 BTU 115V Mini Split both operate on 115V power. These units are designed for smaller rooms up to 750 square feet. They offer high energy efficiency with 20 SEER2 ratings and include Wi-Fi app control for convenient management.
How does the Mountman 12000 BTU compare in efficiency to other options?
The Mountman 12000 BTU 19 SEER2 Mini Split offers slightly lower efficiency than the 20 SEER2 models but remains practical for standard bedrooms or offices. It covers 750 square feet and requires 208-230V power. It includes inverter technology and Wi-Fi app control, balancing smart features with moderate cooling power.
Which unit includes a protective cover for outdoor installation?
The YITAHOME 12000 BTU 115V Mini Split is the only listed unit that explicitly includes a cover. It is designed for small rooms with standard 115V outlets and provides 20 SEER2 efficiency. The inclusion of a cover adds protection for the outdoor component, making it a practical choice for modest spaces.
Is there a quiet option for smaller spaces that uses 230V power?
The Della Vario 9000 BTU Mini Split is designed for quiet, efficient cooling in small rooms. It operates on 230V power and delivers 9,000 BTUs of cooling capacity. With 20 SEER2 efficiency and inverter technology, it prioritizes low energy use and quiet performance over high power output, suitable for bedrooms or home offices.
Which alternative is best for large rooms needing dedicated cooling without multi-zone complexity?
The Temprium 18,000 BTU Mini Split AC is a solid option for single large rooms. It covers up to 1,250 square feet and operates on 230V power. With 20 SEER2 efficiency and quiet operation features, it provides dedicated heating and cooling without the complexity of multi-zone setups, fitting users who need focused comfort.