Well you are a little further south than me (Northern NJ). When I woke up this morning the air temp was 34 degrees, but it got up to about 74 today. Its 5:30pm now and the pool is up to 50 degrees! That is pretty good (six degree rise) running the 80,000 BTU/Hr heatpump. Hopefully we will get it up another 5-10 degrees tomorrow.