If your looking to reduce noise you may have bad bearings on your current pump. You could replace the pump motor or just the bearings. If you are looking to reduce energy costs you might consider a variable speed pump or just a timer for your pump. 2hp sounds large for a 22 k pool. I have used a 3/4 hp pump for my 20 k pool for over 12 years. My polaris uses a booster pump when needed. 220v may be more efficient for your pump if you are using 120v but it is not more electricity saving.