Our CO monitor started going off around 1030pm for about 5 minutes then stopped, we didn't know if there was a real CO problem or if it was the monitor. Erin was polite and efficient. Kelly came quickly and checked through out for CO leak or increase CO but found nothing so it was a malfunctioning monitor. He was very nice and reassured us that calling even in the middle of the night was the right thing to do, better safe than sorry.
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