Short story: 1940 house expanded into huge capt-of-industry castle. I inspect while workers are still completing many items, including HVAC, etc. Could not test HVAC. 6 zones of Cooling/Heating (Forced-Air/gas, electric split ducted systems). 1 year later.. Capt's wife calls me with dire problem: "We are going crazy trying to control the cooling/heating.. too hot, too cold," I tell them to turn all zones off nite before I go and let me go through house. I survey all units, name them, name all t-stats, compressors, furnaces. Then I just turn one on... and go find the furnace/compressor. They had miswired the entire place... little bedroom thermostats were connected to systems meant to condition huge family room and vice versa..