Many Frigidaire air conditioners do come with an Energy Saver mode. This mode optimizes energy efficiency by automatically adjusting the cooling settings to maintain a comfortable temperature while reducing energy consumption. It typically works by cycling the compressor and fan on and off to minimize energy usage.
To determine if the Frigidaire FFRE25L3S2 model has an Energy Saver mode, I recommend referring to the product's user manual or contacting Frigidaire customer support directly. They can provide you with accurate and up-to-date information regarding the specific features and options available on that particular model.