Can anyone brainstorm and think of how changing a transformer for the t-stat in the air handler, changing a thermostat on the wall or changing a board in a compressor (all three have been done to my system) change the cooling in the farthest end of my house. Lennox system 3.5 ton heat pump, installed 2003, worked great. Had this work done Spring 2004 cuz transformer kept blowing in handler, and cooled differently afterward. (Ducts are good, no leaks per FPL.)