Here's the ugly truth: most HVAC failures take place because someone missed a step. Did not calculate the load correctly. Used incorrect equipment. Misjudged the insulation needs. We have fixed dozens of these disasters. And each time, we record another learning. Like in 2017, when we decided on adding smart thermostats to each installation. Why? Because Sarah, our master tech, got frustrated of watching homeowners burn money on inefficient temperature control. Now clients save 20-30% yearly.