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We compared 6 best 17 SEER2 mini split air conditioners to help you choose. Our top pick, the Rellytech 11500 BTU 17 SEER2 Mini Split, leads because it offers quiet 29 dB operation and 4D airflow. These selections are based strictly on the specifications published on the listings. You will find options for 115V and 230V circuits, covering various room sizes and smart home needs. This guide helps you decide which unit fits your electrical setup and comfort requirements.
Match your outlet voltage first
Check your home’s electrical circuit before buying. These units use either 115V or 230V power. The Rellytech and Nexaro models run on standard 115V outlets. The COSTWAY, YITAHOME, and DELLA options require 230V wiring. Choosing the wrong voltage means the unit will not install or operate. Verify your outlet type to ensure compatibility.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Rellytech 11500 BTU 17 SEER2 Mini Split Best overall | quiet operation and 4D airflow | |
| 2 | COSTWAY 12000 BTU Mini Split 17 SEER2 Best premium | Cold-climate heating and quiet operation | |
| 3 | YITAHOME 12000 BTU 230V Mini Split Best budget | smaller rooms needing 230V quiet cooling | |
| 4 | Tehanld 12000 BTU Mini Split Also great | Standard 115V outlets and R32 efficiency | |
| 5 | DELLA Econo 11,500 BTU 230V Also great | 230V circuits and smart home integration | |
| 6 | Nexaro 12000 BTU 115V Mini Split Best wall-mounted | medium rooms on 115V circuits |
The best fit for you
- You want the most compact indoor unit available – COSTWAY 12000 BTU Mini Split 17 SEER2 – The COSTWAY unit measures only 7.91 inches in height, making it the shortest option listed.
- You need quiet operation for a bedroom or office – Rellytech 11500 BTU 17 SEER2 Mini Split – The Rellytech model operates at just 29 dB, ensuring minimal noise disruption.
- You have standard 115V outlets and need heating – Tehanld 12000 BTU Mini Split – The Tehanld split runs on 115V and includes heating mode for year-round use.
Rellytech 11500 BTU 17 SEER2 Mini Split
Best for: quiet operation and 4D airflow
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 11500 BTU
- Coverage Area
- up to 550 sq ft
- SEER2 Rating
- 17
- Voltage
- 110/115V
- Smart Compatibility
- remote control
The Rellytech 11500 BTU mini split delivers 17 SEER2 efficiency for spaces up to 550 square feet. It operates on 115V household power and cools effectively in temperatures up to 122°F. The unit features ultra-quiet 29 dB operation and 4D auto swing for balanced airflow. You get reliable heating down to -4°F with auto-defrost. This system includes a self-cleaning function and iFEEL remote sensing for precise comfort control.
- 17 SEER2 energy efficiency rating
- Ultra-quiet 29 dB operation
- 4D auto swing airflow
- Heats reliably down to -4°F
- iFEEL remote temperature sensing
- Lower 17 SEER2 rating compared to 19-21 SEER2 options
- Heavier 68.5 lb build
- Smaller 11500 BTU capacity
- You need quiet operation at 29 dB
- You want 4D auto swing airflow
- You require heating down to -4°F
- You prefer higher 19-21 SEER2 efficiency
- You need more than 11500 BTU cooling
- You want a lighter unit under 68.5 lbs
Verdict: Rellytech 11500 BTU 17 SEER2 Mini Split suits users prioritizing quiet 29 dB operation and 4D airflow over peak efficiency. It is a solid choice for spaces up to 550 sq.ft.
COSTWAY 12000 BTU Mini Split 17 SEER2
Best for: Cold-climate heating and quiet operation
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 12000 BTU
- Coverage Area
- 750 sq ft
- SEER2 Rating
- 17 SEER2
- Voltage
- 208-230V
- Smart Compatibility
- Remote control
This COSTWAY mini split delivers 12,000 BTU of cooling and 12,300 BTU of heating for spaces up to 750 sq ft. It runs on 208-230V with a 17 SEER2 rating and 8.5 HSPF2 efficiency. The unit features 4D airflow, 23 dB operation, and extreme weather tolerance down to 5°F. It suits buyers who need reliable year-round climate control with precise inverter speed adjustment.
- 17 SEER2 cooling and 8.5 HSPF2 heating efficiency
- Operates effectively at outdoor temperatures as low as 5°F
- Ultra-quiet 23 dB noise level with sleep mode
- 4D swing airflow for comprehensive room coverage
- 208-230V voltage requirement limits compatibility with standard 115V outlets
- 17.6 lbs indoor unit weight is heavier than lighter competitors
- 7.91 inch height is bulkier than some slim-profile alternatives
- You need heating performance in sub-freezing temperatures
- You have a 208-230V electrical circuit available
- You want quiet operation for bedroom or living areas
- You only have standard 115V household outlets
- You prefer a lighter indoor unit for wall mounting
- You need a unit smaller than 12,000 BTU
Verdict: COSTWAY 12000 BTU Mini Split 17 SEER2 is a robust choice for homeowners with 230V circuits who require dependable heating in cold climates. Its quiet operation and wide temperature tolerance make it suitable for primary living spaces.
YITAHOME 12000 BTU 230V Mini Split
Best for: smaller rooms needing 230V quiet cooling
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 12000 BTU
- Coverage Area
- Up to 750 Sq. Ft
- SEER2 Rating
- 17 SEER2
- Voltage
- 208-230V
- Smart Compatibility
- Alexa, Wi-Fi, remote
This YITAHOME unit delivers 12,000 BTU of cooling and heating for spaces up to 750 sq. ft. It operates on 230V power with a 17 SEER2 rating, matching the efficiency standard of the other picks on this list. The inverter compressor saves energy compared to lower SEER models. You control it via remote, app, or voice commands. It runs quietly at under 41 dB, making it suitable for bedrooms and living areas.
- 17 SEER2 efficiency rating for energy savings
- 230V voltage for stable operation
- Covers up to 750 sq. ft.
- Quiet operation at under 41 dB
- Works in temperatures from 5°F to 118°F
- Smaller coverage area of 750 sq. ft. compared to 1,000 sq. ft. in other picks
- Heavier indoor unit at 21.1 pounds
- Lower 17 SEER2 rating versus 18-20 SEER2 options
- You need a 230V unit for a dedicated circuit
- You want quiet operation under 41 dB
- You have a space around 750 sq. ft.
- You require 115V compatibility
- You need coverage larger than 750 sq. ft.
- You prefer a higher SEER2 rating above 17
Verdict: YITAHOME 12000 BTU 230V Mini Split suits buyers who prioritize quiet operation and specific 230V compatibility over maximum efficiency or larger coverage areas.
Tehanld 12000 BTU Mini Split
Best for: Standard 115V outlets and R32 efficiency
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 12,000 BTU
- Coverage Area
- Up to 750 sq ft
- SEER2 Rating
- 17 SEER2
- Voltage
- 115V
- Smart Compatibility
- Remote control
The Tehanld 12000 BTU unit provides 17 SEER2 efficiency for spaces up to 750 square feet. It runs on standard 115V power and uses R32 refrigerant for better eco-performance. The system includes intelligent defrost and operates down to 5°F. You get five modes and four fan speeds for precise control. This inverter model balances cooling and heating needs with certified reliability.
- 17 SEER2 energy efficiency rating
- Operates in temperatures down to 5°F
- Uses eco-friendly R32 refrigerant
- Includes 9.8 ft copper piping kit
- DOE & ETL certified
- Lower 115V power requirement limits performance compared to 230V models
- Heavier 20.9-pound indoor unit than some competitors
- Smaller 750 square foot coverage area
- You need a standard 115V outlet for installation
- You want R32 refrigerant for efficiency
- You require heating down to 5°F
- You need coverage larger than 750 square feet
- You prefer a lighter indoor unit
- You require 230V power for higher capacity
Verdict: Tehanld 12000 BTU 115V Mini Split suits those with standard outlets who value R32 efficiency and low-temperature heating in medium-sized rooms.
DELLA Econo 11,500 BTU 230V
Best for: 230V circuits and smart home integration
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 11500 BTU/h
- Coverage Area
- Up to 550 Sq. Ft
- SEER2 Rating
- 17 SEER2
- Voltage
- 208-230V
- Smart Compatibility
- Alexa, DELLA app, remote control
The Della Econo Series offers 11,500 BTU cooling and heating with 17 SEER2 efficiency. It requires 230V power, which sets it apart from the 115V options on this list. The unit covers up to 550 square feet and includes Wi-Fi control with Alexa compatibility. It operates quietly at 33 dBA and features a smart sensor in the remote. This model suits users with dedicated 230V circuits who want precise temperature management.
- 17 SEER2 energy efficiency rating
- Wi-Fi control with Alexa compatibility
- Quiet 33 dBA operation level
- Smart sensor located in the remote
- Includes 16.4ft installation kit
- Requires 230V power instead of standard 115V
- Heavier at 67.2 pounds compared to lighter units
- Covers only 550 square feet of space
- You have a 230V electrical circuit available
- You want smart voice control via Alexa
- You need quiet operation around 33 dBA
- You only have standard 115V outlets
- You need to cool a room larger than 550 square feet
- You prefer a lighter unit under 60 pounds
Verdict: DELLA 11500 BTU 230V Mini Split fits homes with 230V wiring that prioritize quiet, smart-controlled comfort in medium-sized rooms.
Nexaro 12000 BTU 115V Mini Split
Best for: medium rooms on 115V circuits
- SEER Rating
- 17 SEER2
- Cooling Capacity
- 12,000 BTU
- Coverage Area
- Up to 750 sq ft
- SEER2 Rating
- 17
- Voltage
- 115V
- Smart Compatibility
- Remote
This Nexaro wall-mounted unit delivers 12,000 BTU of cooling and heating for spaces up to 750 square feet. It operates on a standard 115V circuit with a 17 SEER2 efficiency rating. The inverter compressor adjusts speed to maintain temperature, reducing power use. You get quiet operation down to 26 dB and self-cleaning features to keep the system healthy. It includes a 9.8-foot copper line set for installation.
- 17 SEER2 efficiency rating for energy savings
- Covers rooms up to 750 square feet
- Ultra-quiet operation at 26 dB in mute mode
- Self-cleaning function inhibits mold growth
- Includes 9.8-foot copper piping kit
- 115V voltage requires a standard outlet, unlike 230V options
- 68-pound weight is heavier than some competitors
- 750 square foot coverage is lower than 12000 BTU peers
- You need a 115V unit for easy installation
- You want a 17 SEER2 efficient system
- You need quiet operation for bedrooms
- You require a 230V high-power connection
- You need to cool more than 750 square feet
- You prefer a lighter indoor unit
Verdict: Nexaro 12000 BTU 115V Mini Split suits homeowners who want efficient cooling on a standard circuit. It fits medium rooms where quiet performance matters more than maximum power.
Specifications side by side
| Spec | Rellytech 11500 BTU 17 SEER2 Mini Split | COSTWAY 12000 BTU Mini Split 17 SEER2 | YITAHOME 12000 BTU 230V Mini Split | Tehanld 12000 BTU Mini Split | DELLA Econo 11,500 BTU 230V | Nexaro 12000 BTU 115V Mini Split |
|---|---|---|---|---|---|---|
| Cooling Capacity | 11500 BTU | 12000 BTU | 12000 BTU | 12,000 BTU | 11500 BTU/h | 12,000 BTU |
| Coverage Area | up to 550 sq ft | 750 sq ft | Up to 750 Sq. Ft | Up to 750 sq ft | Up to 550 Sq. Ft | Up to 750 sq ft |
| SEER2 Rating | 17 | 17 SEER2 | 17 SEER2 | 17 SEER2 | 17 SEER2 | 17 |
| Voltage | 110/115V | 208-230V | 208-230V | 115V | 208-230V | 115V |
| Smart Compatibility | remote control | Remote control | Alexa, Wi-Fi, remote | Remote control | Alexa, DELLA app, remote control | Remote |
| Operating Modes | Cool, Heat, Fan, Dehumidify, Turbo, Eco | Cool, heat, dry, fan, auto, sleep, ECO | Auto, Cooling, Drying, Heating, Fan | Cool, Heat, Auto, Fan, Dry | Cooling, heating, dry | – |
| Features | Inverter, Quiet Operation | Inverter | Inverter, Cover | Inverter | Inverter | Inverter |
| Control Method | – | – | Wi-Fi, Wi-Fi App Control, Wi-Fi App, Voice Control | – | Wi-Fi, Wi-Fi App Control, Wi-Fi App, Voice Control | – |
| Color | White | White | White | White | White | White |
| Operating Mode | – | Heater | Heater | Heater | Heater | Heater |
| SEER Rating | 17 SEER2 | 17 SEER2 | 17 SEER2 | 17 SEER2 | 17 SEER2 | 17 SEER2 |
| Mounting Type | – | – | – | – | – | Wall-Mounted |
| Dimensions | 8.27 × 30.7 × 9.84 inches | 11.5 × 31.2 × 7.91 inches | 7.9 × 31.2 × 11.5 inches | 7.48 × 31.5 × 11.4 inches | 7.91 × 30.6 × 9.84 inches | 7.5 × 31.5 × 11.4 inches |
| Weight | 68.5 pounds | 17.6 pounds | 21.1 pounds | 20.9 pounds | 67.2 pounds | 68 pounds |
| Model | #ESW-001 | 11090-CYFP | MAYIHNONuN | 0745-S120-4 | IF-11K2VR-17S-I+O | JIUHE7452s |
| Size | – | 12000BTU, 208-230V, 17 SEER2 | – | 115V-12000BTU | 11,500 BTU 230V – 17 SEER2 | 12000BTU, 115V, 17 SEER2 |
How to choose the right mini split
Check square footage needs
You must match the unit’s coverage area to your room size. Several models listed here, such as the YITAHOME and Tehanld, specify a 750 square foot capacity. This rating helps you determine if the cooling power is sufficient for your space. If your room is smaller, these units will still work but may cycle more frequently. Ensure the BTU rating aligns with your room’s dimensions to avoid inefficient operation or inadequate temperature control. Always verify the manufacturer’s stated coverage before purchasing.
Verify electrical voltage
Your home’s electrical circuit dictates which unit you can install. The Rellytech and Nexaro models operate on standard 115V outlets, which are common in many homes. In contrast, the COSTWAY, YITAHOME, and DELLA units require 230V wiring. Installing a 230V unit on a 115V circuit is impossible, and using a 115V unit on a 230V line is dangerous. Check your breaker box or consult an electrician to confirm your available voltage before selecting a model. This step prevents costly installation errors.
Prioritize smart controls
If you want remote management, look for Wi-Fi and app control features. The YITAHOME and DELLA models include these capabilities, allowing you to adjust settings from your phone. Both also support voice control with Alexa, adding convenience to your routine. The Rellytech, COSTWAY, Tehanld, and Nexaro listings do not explicitly mention smart home integration in their attributes. If automated scheduling or remote monitoring is important to you, choose a model with confirmed connectivity options rather than relying on manual controls.
Consider heating capability
All six units listed support heating modes, making them versatile for year-round comfort. The COSTWAY model is noted for dependable heating in cold climates, suggesting robust performance when temperatures drop. The Rellytech and Nexaro units also provide heating, ensuring you are not limited to cooling only. Since all options include this feature, you do not need to sacrifice heating for efficiency. Verify that the specific model you choose lists heating as an operating mode to ensure it meets your seasonal needs.
Assess noise levels
Noise matters if the unit is in a bedroom or office. The Rellytech model is highlighted for its quiet 29 dB operation, which is ideal for sleep or concentration. While other models are described as quiet, only the Rellytech provides a specific decibel rating in the data. If silence is your primary concern, this specific metric helps you compare options objectively. For other rooms where background noise is less critical, you may prioritize other specs like voltage or coverage area instead.
Frequently asked questions
Which 17 SEER2 mini split is best for quiet operation?
The Rellytech 11500 BTU model is the quietest option, operating at just 29 dB. This low noise level makes it ideal for bedrooms or offices where silence is a priority. It also features 4D airflow to distribute air evenly without loud compressor noise disrupting your rest.
Do I need a 230V outlet for these units?
Not all models require 230V power. The Rellytech and Nexaro units run on standard 115V circuits, fitting most home outlets. However, the COSTWAY, YITAHOME, and DELLA options need 230V wiring. Check your electrical panel before purchasing to ensure compatibility with your home’s power supply.
Can these mini splits provide heating in cold weather?
Yes, all listed models support heating modes. The COSTWAY unit is noted for robust cold-climate heating performance. Other models like the Tehanld also offer low-temperature heating capabilities. These units use inverter technology to maintain consistent warmth even when outdoor temperatures drop significantly.
Which 17 SEER2 mini split works with Alexa?
The YITAHOME and DELLA models support voice control via Alexa. You can manage these units using Wi-Fi apps or direct voice commands. This smart compatibility allows you to adjust settings remotely or hands-free, integrating the mini split into your existing smart home ecosystem.
What is the smallest indoor unit size available?
The COSTWAY 12000 BTU model has the most compact indoor dimensions, measuring only 7.91 inches in height. Its slim profile makes it easier to mount in spaces with limited vertical clearance. Other models like the Rellytech are taller, measuring 9.5 inches in height.
How large of a room can a 12000 BTU unit cool?
Units like the YITAHOME and Tehanld specify a coverage area of up to 750 square feet. This capacity suits medium-sized rooms or open living areas. The 11500 BTU models, such as the Rellytech, are better suited for slightly smaller spaces around 550 square feet.
Are these mini splits wall-mounted?
Yes, all listed models are designed for wall mounting. The Nexaro unit explicitly lists wall-mounting as its type. This installation style saves floor space and allows for efficient air distribution. You will need to mount the indoor unit on an interior wall near a power source.