Will EWT / LWT continue to drop as heating season progresses? If so, any idea how much? Currently, my EWT is about 33 and LWT about 28. Recent cold snap has temps in single digits. We still have 1.5 months of winter temps left. I'm in northwestern PA. My set point is currently at 60 as house is unoccupied. Also, how do I determine the % of antifreeze in system?