So I'm house sitting for a friend, and I cane home today and it smelt strongly of gas. I opened all the windows and aired the house out. They all told me I'm smelling things because they have a carbon monoxide alarm. I closed up and went back to work but now I'm back, I still smell gas, windows are now open again , but I did some research that says the alarm wouldn't go off for the gas leak, and I'm not sure where the gas would be coming from.