Bests & Worsts Reviews from Amazon

I honestly believe this product saved our lives. We had a fire in our fireplace on a cold day. It warmed our house so much that the furnace actually turned off for most of the day. When we went to bed and the fire went out, the furnace kicked back on. We hadn't realized that the exhaust for the furnace was not to code (not high enough on the roof pitch). We suspect now that the cold air had settled down into the furnace's exhaust. When the furnace kicked back on, the cold air prevented the CO2 from venting, pushing it back into our furnace room. This alarm sounded in the middle of the night and woke me up. My husband's thought was that it was just the battery - and he suggested that I just pull the battery and deal with it in the morning. Luckily, I read the digital number readout on the alarm and knew that it was NOT a battery issue. Foolishly, I took the alarm with me down to the basement furnace room (I could have been killed by the CO2), and watched the numbers climb. I knew immediately that we needed to open windows/doors and get out. I now have one on each floor of my home. Never, NEVER disregard when you hear this alarm sound. The digital read out definitely confirmed that there was an issue - and I loved the fact that I could unplug it from the wall and walk around the home watching for a change in the readings. And, yes, we promptly made sure that everything was code - but I will never be without the peace of mind that this detector gives me.