Just read your thread and I am very sorry. We had a close call with our tank 2 months ago. My husband was up and heard the chiller running at 4am! I too live in the Pgh. area so my chiller never runs in December. (A power outage fried the controller to the chiller, along with some of our cable devices). I immediately got up to find my tank at 50 degrees, and the fish swirling on the sandbed. I figured they were all dead but proceeded to do warm WCs a half gallon at a time. After 3 hours I warmed the tank to 70, and amazingly revived 4 of my 7 fish and all the corals even my crocea clam survived.
I can't even imagine the heart ache you and your family feel. It hurts just reading what you went thru. Again I am so sorry.