San Antonio furnaces sit idle for eight to nine months each year. When a winter cold front drops temperatures from 75 degrees to 28 degrees overnight, heating systems that have not run since February suddenly kick on under full load. Ignitors that weakened during months of inactivity fail on the first cold night. Blower motors with dried bearings seize up. Heat exchangers that cracked from age and thermal stress during the last heating season finally fail completely. That long dormant period combined with sudden demand creates the perfect storm for emergency heating failures across Bexar County.
San Antonio's expansive clay soil creates additional stress on HVAC systems. As soil moisture changes with seasonal rainfall, the ground swells and shrinks. This movement shifts foundation slabs and stresses ductwork connections throughout your home. A supply duct that pulls loose from a boot connection dumps heated air into your attic instead of your living space. You pay to heat your attic while your family freezes. Local HVAC technicians who understand soil movement and foundation shift can diagnose these problems quickly. Companies from out of town miss the connection between a cold house and a duct separation caused by soil settling.