Let me share the harsh truth: the majority of HVAC failures happen because someone ignored a step. Didn't calculate the load properly. Used undersized equipment. Got wrong the insulation needs. We have fixed countless of these failures. And each time, we file away another lesson. Like in 2017, when we began adding smart thermostats to every install. Why? Because Sarah, our lead tech, got sick of watching homeowners burn money on inefficient temperature settings. Now clients save hundreds yearly.