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Using Emergency Heat:
Emergency heat is useful when the automatic auxiliary heat system can't keep
up with demand. (Systems with heat pumps use "auxiliary heat" when it's too
cold outside for the heat pump to heat the house without help. The thermostat
display indicator for this is auxiliary heat on.)
If the heat pump compressor that works with auxiliary heat fails, or if the heat
pump isn't working at all, you can turn on the emergency heat for that extra
help. (You'll know there's a problem if the house can't seem to get warm when
it's very cold outside.) You want to avoid using emergency heat, though,
because it's the most expensive option. And, of course, if you suspect a
problem with your heat pump, call for service immediately.
Here's how to set your thermostat to use emergency heat.
1. Open the thermostat door.
2. Press and release the mode button repeatedly until the arrow under the
button moves to Em heat on the screen.
3. Close the thermostat door.
Using Emergency Heat