Very important to keep your furnace clean and make sure proper detectors are installed.
Speaking of which, having just converted from electric to a superb 6 burner gas range stove and convection oven (Lodge cast iron skillets yeah!), while I was looking for a more suitable range hood, I noticed they now sell natural gas detectors in addition to the standard smoke and CO detectors, bout two an installed them as well...but having a natural gas detector, makes perfect sense.