Our Infinity system is up and running and I want to set the temps. Any suggestions on the spread between high and low? We live near Hartford, CT, so we do need to get up into the 67-68 range on many days. We have 3 zones, so I am more than happy to set our bedroom (only room on its zone) as low as it can go during the day, and then keep it in the 63-64 range at night. On the opposite end of the spectrum, I am happy to set the living space down real low at night and then set in the mid-60s during the day.