This is the ugly truth: most HVAC failures occur because someone ignored a step. Didn't calculate the load correctly. Used undersized equipment. Misjudged the insulation needs. We've personally fixed countless of these failures. And each and every time, we record another lesson. Like in 2017, when we started adding smart thermostats to all system. Why? Because Sarah, our master tech, got sick of watching homeowners waste money on poor temperature control. Now clients save hundreds yearly.