Make sure you call your local fire dept! We had some farmers that smelled smoke around an old barn with over a hundred round bales of hay. They didn't smell it very strong inside so they thought they were ok. They should have called us out, even as a service run. Our Dept. has a thermal imaging camera that can easily detect a hot spot. Now not all dept's have those, but some have digital heat detectors. It's much easier for us to come out and check this for you, if most dept's are like ours we don't mind. I sure would rather do that then get woken up at 4 AM, and then spend 10 hours dragging hoses around. (Getting a little to old for that!) Luckily, nobody's hurt, just an old barn and hay lost for the owners. If in doubt, move it out!