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How heat pumps actually work, in plain English. No jargon, no sales pitch.
A heat pump does not make heat. It moves heat that already exists, which is exactly why it can deliver three or four units of warmth for every unit of electricity it drinks.
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The short answer is yes, and modern cold-climate units are rated to keep producing useful heat down to -13°F. The longer answer is about capacity, not failure.
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The comparison everyone gets wrong, because they compare efficiency percentages instead of comparing the price of a delivered BTU.
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COP is the cleanest efficiency number in HVAC and the one manufacturers are least eager to put on the box. Here is how to read it.
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Equipment brand accounts for a small share of how your system performs. Installation quality accounts for most of it. Screen the installer harder than the box.
Start with the two possibilities that are completely normal, then work through the five that are not. Most cases resolve without a service call.
Mitsubishi reports faults as two-character codes and as LED blink patterns. Here is how to retrieve a code and what the major families of codes point to.
A light coating of frost in winter is expected. A block of ice encasing the coil or ice on the top of the unit is a problem you should not ignore.