It's possible to use a universal remote control with a Gree mini split air conditioner, but it may not have all the same functions as the original remote. The compatibility of a universal remote depends on the specific model and brand of both the mini split and the universal remote. It's recommended to check with the manufacturer or retailer for compatibility before purchasing a universal remote. Additionally, some features such as privacy lock may not be available on a universal remote, so it's important to consider what functions are necessary before making a purchase. Overall, using a universal remote can provide more convenience and flexibility for controlling your Gree mini split air conditioner.