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Here's the ugly truth: most HVAC failures take place because someone missed a step. Didn't calculate the load accurately. Used cheap equipment. Misjudged the insulation needs. We've personally fixed dozens of these messes. And each time, we remember another learning. Like in 2017, when we began adding smart thermostats to all system. Why? Because Sarah, our lead tech, got frustrated of watching homeowners burn money on bad temperature settings. Now clients save 20-30% yearly. https://community.cisco.com/t5/user/viewprofilepage/user-id/1951244