Health officials warn if you allow this to happen this winter, a home appliance could kill you.
This past week has been one of the coldest weeks in the Hudson Valley in recent memory.
At the start of the week, experts warned New Yorkers it was going to be one of the coldest weeks in recent memory.
Upstate New York residents were told temps could drop as low as -25 degrees.
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"Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures," the National Weather Service stated in its Cold Weather Advisory.
Below were the predicted highs and lows this week for the Hudson Valley.
In some areas, temps dipped well below the predictions. On Tuesday, it was -15 degrees at the Montgomery Airport, the lowest in the past six years, according to Ben Noll.
It's safe to assume, most New Yorker's home heating systems were in overdrive this week.
I raised my heat slightly higher than I've ever had it.
The New York State Division of Homeland Security and Emergency Services took to social media to warn all New Yorkers with furnace, boiler and water heater vents to keep them clear of snow.
If you don't, you could deal with serious health issues.
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"This winter, remember to keep furnace, boiler & water heater vents clear of snow. If your furnace exhaust vent is blocked, it could stall your heating system & blocked intake vents can create a buildup of CO (Carbon monoxide) in your home," the New York State Division of Homeland Security and Emergency Services states.
Carbon monoxide prevents the body from using oxygen, which can lead to asphyxiation.
In severe cases, CO poisoning can cause brain damage, heart damage and even death.
You can die from CO poisoning in your sleep before developing symptoms.
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Typical symptoms include headaches, dizziness, nausea, vomiting, chest pain, and confusion