Let me share the brutal truth: the majority of HVAC failures happen because someone ignored a step. Did not calculate the load accurately. Used incorrect equipment. Got wrong the insulation needs. We've personally fixed hundreds of these disasters. And each and every time, we file away another insight. Like in 2017, when we started adding WiFi controls to all install. Why? Because Sarah, our senior tech, got sick of watching homeowners burn money on inefficient temperature management. Now clients save $500+ yearly.