With winter coming, do an inventory of your home's smoke alarms and CO detectors. Our living room CO detector saved our lives, no joke! Back in 2014 we had a cold October and we had not scheduled our annual HVAC inspection. Well, each HVAC has a monitor that detects and controls the amount of CO exhaust. We had a very wet summer and the outdoor HVAC's monitor rusted off! Yet, it still fired up. All of that CO came into the house. The monitor went off, everybody went outside, the fire department showed up, and within 30 minutes they found the culprit. That CO detector purchased at Home Depot cost less than fifty bucks.