Here's the harsh truth: most HVAC failures happen because someone ignored a step. Did not calculate the load properly. Used incorrect equipment. Misjudged the insulation needs. We've personally fixed countless of these disasters. And each and every time, we file away another learning. Like in 2017, when we began adding smart thermostats to all system. Why? Because Sarah, our senior tech, got tired of watching homeowners waste money on bad temperature control. Now clients save $500+ yearly.