Let me share the brutal truth: nearly all HVAC failures take place because someone skipped a step. Didn't calculate the load accurately. Used undersized equipment. Got wrong the insulation needs. We've personally fixed dozens of these failures. And each and every time, we remember another learning. Like in 2017, when we decided on adding WiFi controls to every installation. Why? Because Sarah, our senior tech, got sick of watching homeowners burn money on poor temperature management. Now clients save 20-30% yearly.