You should not need to replace a CO detector after 1.5 years. Should last 5 years easily and many last 10.
CO is not something to gamble on - it is the colorless, odorless killer and you won't even know you are dying.
A faulty LP furnace can leak CO into the interior, though it may take sometime to accumulate enough to set the alarm off.
If your thermostat is set 5 or more degrees above the actual interior temperature, the furnace will come on in addition to the heat pump. Turn the t-stat down a bit if you want electric only.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is now West Palm Beach, FL
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