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Our heat stopped on a 19-degree Tuesday night. The first company we called claimed the heat exchanger was cracked without showing a single photo, then brought in an advisor with financing papers. Rafael put a borescope camera inside every cell with me watching, ran a combustion test showing 3 ppm in the flue and 0 ppm in the supply air, found a cracked condensate pressure hose, and had our heat running in forty minutes.