Single Zone Mini-Splits: 115V vs 220V - Which is Right for Your Client?

Source: GREE

When it comes to installing a mini-split system, selecting the right voltage is crucial for both performance and energy efficiency. GREE mini-split systems offer a range of options to cater to different needs, whether it’s for a compact room or an expansive space. Understanding the differences between 115V and 220V options is key to achieving optimal climate control in your environment.

GREE mini-split systems come in both 115v and 220v options to cater to diverse home cooling and heating needs. The key distinctions between 115v and 220v AC heat pump systems lie in their BTU (British Thermal Unit) capacities and installation procedures, both of which are vital considerations when choosing the right system for your space.


BTUs are the standard unit of measurement for thermal energy, indicating the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Larger spaces require a unit with a higher BTU rating to effectively manage temperature control. To accurately gauge the BTU requirements for your room, calculate the cubic volume and then apply a conversion factor that varies based on room type and specific conditions such as sunlight exposure, room occupancy, and whether it's a kitchen or a living area.

Typically, GREE's 115v mini-splits offer a BTU range suitable for smaller rooms, usually providing between 9,000 and 12,000 BTUs. On the other hand, the 220V models are more suitable for larger areas with capacities starting at 9,000 BTU and going up to 36,000, ensuring efficient temperature control for expansive spaces.

Installation approaches differ based on the system's voltage. Both 115V and 220v GREE mini-split systems are directly connected to your home's main electrical panel, complete with a dedicated circuit breaker to handle their higher electrical demands safely.

However, voltage isn't the sole factor affecting a mini-split's performance. Efficiency is paramount, and with GREE, you can expect to find highly efficient models across both voltage categories. The efficiency is quantified by the SEER (Seasonal Energy Efficiency Ratio) rating, where a higher SEER signifies greater energy effectiveness. GREE prides itself on offering mini-splits with SEER ratings that not only meet but often exceed the mandatory minimums set forth by U.S. regulations, ensuring both eco-friendliness and cost-effectiveness for our customers.

When to Choose a 115V Mini-Split

A 115V mini-split system is often suitable for smaller spaces or specific scenarios where installation flexibility is required. Here’s when you should consider a GREE 115V system:

  • Ideal for Smaller Spaces: GREE’s 115V units are designed to efficiently heat or cool smaller areas, making them perfect for individual rooms, smaller apartments, or supplementary heating and cooling in larger homes. Their compact size and low power requirement make them an excellent choice for targeted climate control.
  • Cost-Effective Installation: These systems can be integrated into existing wiring setups, offering a more budget-friendly installation process. This is especially advantageous for older homes or buildings where electrical system upgrades might be challenging or costly.

When You Need a 220V Mini-Split: The Case for More Power

For larger areas and when higher BTU output is necessary, a 220V mini-split system from GREE is the way to go. The higher voltage system ensures adequate power for larger spaces or for setting up multiple climate zones. Here’s why a GREE 220V unit might be your best choice:

  • High BTU Output: These units are capable of delivering higher BTU levels, essential for effectively managing the climate in larger spaces or open floor plans. They are ideal for main living areas, commercial spaces, or entire homes, providing consistent and reliable heating and cooling.
  • Expandability: GREE’s 220V mini-splits can be the foundation for a larger, zoned HVAC system should you decide to expand in the future. They offer the flexibility to create a tailored climate control solution that can grow with your needs, whether in a residential or commercial setting.
  • Efficiency: Higher voltage systems, like the 220V, transfer more power to an appliance without requiring as much current from the main circuit breaker, leading to better energy utilization. This is particularly important in larger spaces where higher power is needed. The relationship between voltage, current, and power, as described by Ohm’s Law (I = P/V), helps in determining the necessary amperage for a desired power output, which in turn influences the choice of wire size and overall system efficiency.

In practical terms, for smaller spaces and simpler installation requirements, a 115V mini-split system is often adequate, integrating well into existing wiring setups and providing efficient climate control for compact areas. Conversely, for larger spaces or higher BTU needs, a 220V system is more appropriate. It not only handles higher electrical loads safely but also offers the potential for expandability in the future.

115V Mini-Split AC Units vs 220V Mini-Split Systems: Final Thoughts

Whether you choose a 115V or a 220V mini-split heat pump system, GREE provides options that cater to your specific needs without compromising on efficiency or performance. Keep in mind the size of the space, your current electrical setup, and future expansion possibilities when making your decision. By carefully considering these factors, you can select a system that not only meets your immediate needs but also offers flexibility for future changes.

If you’re designing your next client’s system, consider using our system builder tool to design the ultimate HVAC solution, tailored to your client's needs. You can also review our system documentation, or FAQ page if you have any questions about our 115V units or 220V systems. If you’re a homeowner looking for more information on GREE’s mini-split systems and to find the ideal voltage option for your project, visit GREE’s mini-split product page or contact a GREE certified HVAC contractor. Our experts are always ready to assist you in choosing the perfect solution for your heating and cooling needs, ensuring comfort and efficiency for years to come.