Choosing the best mini split system with auxiliary heat can provide efficient cooling and reliable supplemental heating for your home throughout the year. Mini splits with auxiliary heat are ideal for colder months when the heat pump alone cannot maintain comfort. This guide reviews top-rated mini split systems featuring inverter technology, heat pump functionality, energy efficiency ratings (SEER2 and HSPF2), and smart features like WiFi control and Alexa compatibility.
| Product | BTU Capacity | SEER2 / HSPF2 | Special Features | Coverage Area |
|---|---|---|---|---|
| COSTWAY 18k Dual 2 Zone Mini Split | 9000 + 12000 BTU | 22 SEER2 / 10 HSPF2 | Multi-room control, R32 refrigerant, 6 modes | Multi-zone coverage |
| DELLA Vario Series 12000 BTU Mini Split | 12000 BTU | 19 SEER2 / 8.5 HSPF | Alexa compatible, smart sensor, automatic defrost | Up to 550 sq. ft |
| COSTWAY 12000BTU Mini Split Air Conditioner & Heater | 12000 BTU | 20 SEER2 | 5 modes, inverter technology, quiet operation | Rooms up to 750 sq. ft |
| hykolity 12,000 BTU Wifi Enabled Mini Split | 12000 BTU | 19 SEER2 / 8.5 HSPF2 | WiFi control, variable frequency, energy-saving modes | Up to 750 sq. ft |
| Senville LETO Series 18000 BTU Mini Split Heat Pump | 18000 BTU | 19 SEER2 | Alexa enabled, 4-in-1 functionality, turbo mode | Up to 1.5 tons |
COSTWAY 18k Dual 2 Zone Mini Split Air Conditioner
The COSTWAY 18k Dual 2 Zone Mini Split offers customized temperature control across two zones with 9000 BTU and 12000 BTU units. Its energy star-certified inverter technology achieves an impressive 22 SEER2 rating and 10 HSPF2 for heating efficiency, reducing energy consumption. Utilizing environmentally friendly R32 refrigerant, this unit supports sustainability. It operates reliably in extreme climates ranging from -13℉ to 125℉. The system provides six operation modes (auto, cool, heat, dry, fan, sleep) with adjustable wind speeds, making it ideal for multi-room comfort year-round.
DELLA Vario Series 12000 BTU Mini Split System
The DELLA Vario Series 12000 BTU mini split features a pre-charged heat pump suitable for heating in temperatures down to -4℉. This inverter system provides an energy-efficient 19 SEER2 rating and 8.5 HSPF. Smart features include Alexa compatibility, automatic defrost, self-cleaning, and I Feel mode that adjusts airflow based on remote sensor temperature for precise comfort. With multiple fan speeds and eco modes, this compact system cools spaces up to 550 sq. ft efficiently.
COSTWAY 12000BTU Mini Split Air Conditioner & Heater
This COSTWAY 12000BTU Mini Split combines advanced inverter technology with a powerful heat pump to efficiently cool and heat rooms up to 750 sq. ft. Featuring a 20 SEER2 rating, it offers five versatile modes, including auto, cool, heat, dry, and fan with multiple fan speeds. The unit operates quietly with sleep and ECO modes to ensure minimal noise disruption and energy savings. A user-friendly remote with a smart timer enhances convenience.
hykolity 12,000 BTU Wifi Enabled Mini Split Air Conditioner
The hykolity 12000 BTU mini split comes WiFi-enabled for remote control through smartphone apps and voice assistants. It boasts a 19 SEER2 and 8.5 HSPF2 rating, promoting energy savings up to 30% thanks to its variable frequency inverter technology. The unit features whisper-quiet operation, 4D airflow, multiple operational modes, and a built-in heat pump that efficiently maintains temperatures ranging from 61℉ to 88℉ for spaces up to 750 sq. ft.
Senville LETO Series 18000 BTU Mini Split Air Conditioner Heat Pump
The Senville LETO Series 18000 BTU system offers a robust heating and cooling solution with inverter technology, achieving a 19 SEER2 rating and functional heating capability down to 5℉. It supports voice control through Alexa, integrating smart home convenience. This 4-in-1 unit provides air conditioning, heat pump, dehumidification, and fan operation plus turbo mode, balancing performance and style for various indoor settings.
Buying Guide: How to Choose the Best Mini Split with Auxiliary Heat
BTU Capacity & Room Size Matching
Select a mini split system with BTU capacity suitable for your room size to avoid inefficiency. For rooms up to 750 sq. ft, 12000 BTU models like COSTWAY or hykolity are optimal. Larger rooms require higher capacities such as 18000 BTU Senville models or multi-zone setups.
Auxiliary Heat For Colder Climates
Auxiliary or supplemental heat supports the heat pump when outdoor temperatures drop below the heat pump’s effective range. Look for models with heat pumps rated for low ambient heating (-4℉ to 5℉ or lower) and automatic defrost to maintain winter performance.
Energy Efficiency Ratings (SEER2 & HSPF2)
Higher SEER2 (cooling) and HSPF2 (heating) ratings indicate better energy savings and reduced operating costs. Models like COSTWAY dual zone deliver up to 22 SEER2, ideal for energy-conscious consumers.
Smart Features & Controls
WiFi connectivity and Alexa compatibility enhance control convenience. Features like “I Feel” mode, self-diagnosis, timers, and multiple fan speeds enable tailored comfort and energy savings.
Installation Kit & Ease of Setup
Many mini splits come with installation kits including wall mounts and piping. Ensure your choice provides a kit or that professional installation is feasible. Consider unit size, noise levels, and maintenance requirements when selecting.
Environmental Considerations & Refrigerant Type
Newer units using R32 refrigerant reduce greenhouse impact compared to older refrigerants. Prioritize products with ETL, AHRI certifications and eco-friendly refrigerants for sustainability.
Multi-Zone vs Single Zone Systems
If you need to control temperature in multiple rooms, a dual or multi-zone mini split like COSTWAY’s 2 Zone model offers better customization and efficiency than single-zone units.