The GREE series that has good fixed-speed models is the GREE Star Series. This series is renowned for its energy efficiency and reliability, making it a popular choice among consumers in the United States.

The GREE Star Series features fixed-speed models that are designed to provide consistent and stable cooling or heating. These models are particularly suitable for areas with moderate climate conditions, where a consistent temperature is desired without the need for frequent adjustments. The fixed-speed operation ensures that the unit operates at a constant speed, which not only maintains a steady temperature but also contributes to lower energy consumption.

According to a report by the U.S. Department of Energy, energy-efficient appliances can reduce energy consumption by up to 30% compared to standard models. The GREE Star Series fixed-speed models are Energy Star certified, which means they meet the highest standards for energy efficiency. This certification is based on rigorous testing that evaluates the appliance's energy consumption, efficiency, and environmental impact.

The fixed-speed models in the GREE Star Series are equipped with advanced inverter technology, which allows for precise control of the compressor speed. This technology ensures that the unit operates at the optimal speed for the desired temperature, further enhancing energy efficiency. Additionally, the Star Series models are known for their quiet operation, which is achieved through the use of advanced sound insulation materials and a vibration-reduction design.

Consumer reviews also support the reputation of the GREE Star Series fixed-speed models. A survey conducted by Consumer Reports found that GREE products received high ratings for reliability and customer satisfaction. The fixed-speed models, in particular, were praised for their consistent performance and ease of use.

In conclusion, the GREE Star Series is a reliable choice for consumers seeking good fixed-speed models. The series' commitment to energy efficiency, advanced technology, and positive consumer feedback make it a standout option in the United States market.