I went on a service call for an older couple who had been without heat or ac for two years. They said they wanted me to check out the system and find out what it would take to fix it, they did not want to go through another hot Texas summer in the heat.
Found the problem in about 1 min
The furnace was unplugged. Heres your bill, LMAO
Wish I had a camcorder for when I told the wife what had been wrong