Let me share the brutal truth: most HVAC failures happen because someone ignored a step. Didn't calculate the load properly. Used undersized equipment. Got wrong the insulation needs. We've personally fixed dozens of these messes. And each and every time, we file away another lesson. Like in 2017, when we started adding remote monitoring to all install. Why? Because Sarah, our senior tech, got sick of watching homeowners burn money on bad temperature settings. Now clients save $500+ yearly.