Have used heat pumps for many years, and you're right- auxiliary and emergency heat are two different things. And auxiliary heat will be needed anytime you get below freezing, at least intermittently. We've been into the low teens, and aux. has always handled it. But its not a true test, because when it gets that cold, we run the woodstove night and day.
I'm not sure, but I'm thinking the actual heat strips used are the same for aux and emer heat- but emergency just switches them on directly, bypassing the control system, if the system goes south. Maybe it adds some additional ones in emergency mode.
If the system is 12 years old, its probably on borrowed time at this point.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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