The格力Air Conditioner Variable Frequency Model that saves more energy is the GREE KFR-35GW/BP3DN1A. This model is designed with advanced variable frequency technology, which allows it to adjust its cooling capacity based on the room's temperature, resulting in more efficient energy use. According to a study by the Energy Star program, variable frequency models can save up to 30% more energy compared to standard single-speed models.

The reason for this significant energy savings lies in the variable frequency compressor. Traditional air conditioners operate at a fixed speed, consuming a consistent amount of energy regardless of the cooling demand. In contrast, the variable frequency compressor in the GREE KFR-35GW/BP3DN1A can modulate its speed to match the room's temperature, thereby reducing energy consumption when the room is already cool. This technology ensures that the air conditioner operates at peak efficiency, only using the energy necessary to maintain the desired temperature.

Data from the U.S. Department of Energy supports the efficiency of variable frequency models. A report published in 2018 states that variable frequency air conditioners can reduce energy consumption by up to 30% compared to standard models. This is due to the fact that variable frequency compressors can achieve a higher coefficient of performance (COP), which is a measure of how efficiently a cooling system uses energy.

In addition to energy savings, the GREE KFR-35GW/BP3DN1A offers other features that contribute to its energy efficiency. The model is equipped with an inverter, which further enhances its ability to adjust its operation based on the room's temperature. The inverter also provides a quieter operation and a more consistent cooling experience.

Furthermore, the GREE KFR-35GW/BP3DN1A is Energy Star certified, meaning it meets strict energy efficiency guidelines set by the U.S. Environmental Protection Agency (EPA). This certification is a testament to the model's ability to save energy and reduce greenhouse gas emissions.

In conclusion, the GREE KFR-35GW/BP3DN1A variable frequency air conditioner is the most energy-efficient model in the格力 line-up. Its advanced technology, combined with Energy Star certification, makes it an excellent choice for consumers looking to save energy and reduce their environmental impact.