Also, don’t forget to check your carbon monoxide detectors as well. If you have questions about your detector, you can call your local fire department on the non-emergency line.

While Airbnb recommends that hosts install carbon monoxide and smoke detectors—and provides them for free to eligible renters—neither is actually required by the rental platform, per its website.

Carbon monoxide, or CO, is a gas that forms whenever a fossil fuel is burned. And as more people begin to crank up their furnaces, there may be possibilities for CO issues.