Is your pool pump running nonstop? ENERGY STAR® reports that your old pool pump can add more than $500 to your annual energy bills. As pool season begins, look for discounts on a new pool pump. Variable speed ENERGY STAR pool pumps use variable speed compressors that work only as hard as needed, which can significantly reduce your electric bill. Hidden #35802001. There could be savings of up to more than $400 in energy costs each year. Another bonus is that they are whisper quiet when running at low speeds, which is most of the time! If your pump is struggling or is close to 10 years old, it may be time for a replacement.