With asbestos, radon and lead poisoning, you probably think you have enough to worry about in your home. But, there's another threat, yet -- carbon monoxide. it's tasteless, odorless and invisible. Carbon monoxide is a byproduct of combustion. Clogged gas and wood-burning appliance flues, air intakes and exhaust pipes and a cracked furnace heat exchanger are a few ways carbon monoxide gets into your home. You can buy chemical testers for less than $10 that will last for a year. Better yet, spend extra and get one that detects carbon monoxide, and then warns you with an audible alarm. And that's the On The House tip for today.