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Sizing, brand comparisons and the questions to ask before you sign.
Square footage gets you a rough starting point. Everything that actually determines the answer — insulation, windows, air leakage, climate — is invisible in that number.
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Two excellent brands with genuinely different priorities. The right answer depends on your climate, your installer network and how cold your winters get.
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A standard smart thermostat can quietly triple your winter bill by calling for backup heat when it is not needed. Heat pump compatibility is not optional.
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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.
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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.