I have CHA with a gas furnace. I've noticed on about 5-10 occasions a year, I will smell gas in my home. This happens whether the AC or the heat is on. I am wondering why this is happening and if I should be concerned. The smell usually lasts one day and goes away, and yes, I'm sure it's gas, and it smells from the vents and around the furnace. Everything functions normally when I smell the gas. Just wondering, thanks for any answers.