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Here's the ugly truth: nearly all HVAC failures occur because someone skipped a step. Didn't calculate the load accurately. Used incorrect equipment. Got wrong the insulation needs. We've personally fixed hundreds of these messes. And each time, we record another learning. Like in 2017, when we decided on adding WiFi controls to each installation. Why? Because Sarah, our master tech, got sick of watching homeowners lose money on poor temperature management. Now clients save hundreds yearly. https://community.cisco.com/t5/user/viewprofilepage/user-id/1951244