Plug-in car heaters are never as effective as the built-in heating systems they are intended to replace, but they are almost always better than no heating at all.
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The biggest problem is that drivers often opt for plug-in heaters to replace or supplement a factory heater that is no longer working. And that is a heat output that simply cannot be matched due to the inherent limitations of plug-in car heaters.
There are two main plug-in car heater options available, and they are not all the same.
Within these two basic categories there are a number of subtypes, including: