Hence the relatively small projected sea level rise by the year 2100, as compared to the changes measured in tens of meters that occurred in Earth's history (see Introduction). The rise by 2100 is only a small beginning of a much larger, multi-century response of ocean and ice sheets to elevated global temperatures.
Single Speed Pool Pumps: Runs at a single speed, 3450 rpm (revolutions per minute). Imagine if your car ran at 3450 rpm - all the time, and how much gas you would use! Dual Speed Pool Pumps: Have a fourth wire coming into the pump, the low speed wire. This allows you to run the pump on low speed for 8-16 hrs per day, and high speed for 4-8 hrs. Variable Speed Pool Pumps: Operates at many speeds, programmable and self-optimizing for the highest energy efficiency and greatest energy savings.
I don't know how much it costs to run our pool pump, but when I read the post saying $250/month got me concerned enough to check into it. We have a typical size pool (pool builders call it standard size). We run our 1HP pump an average of 5 hrs/day (6 hrs/day in summer and 4 hrs/day in winter). would guess $500/Month (midwest utility prices) for 45,000 gallons if you keep it warm, 84F. My family would say, can't have cold water in the pool. While we are on realestate hold here, on the wish list is pool/spa, creative landscaping, some sort of view and as high efficiency heating as you can get.