Add Yahoo as a preferred source to see more of our stories on Google. Hand holds a phone with the Nest app next to a Nest thermostat on a screen indicating HVAC running time - oasisamuel/Shutterstock ...
A stretched polar vortex and plunging cold temperatures have heaters and furnaces working overtime this winter, causing many to question when to use the emergency heat or what 'aux heat' means when it ...
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