Let me share the ugly truth: most HVAC failures take place because someone missed a step. Did not calculate the load accurately. Used cheap equipment. Misjudged the insulation needs. We've personally fixed hundreds of these messes. And every time, we file away another insight. Like in 2017, when we started adding WiFi controls to each system. Why? Because Sarah, our lead tech, got sick of watching homeowners waste money on inefficient temperature management. Now clients save $500+ yearly.