Be careful with a heater in a portable blind. Most if not all are NOT flame resistant. If you are going to have one of these, I suggest you also have a good fire extinguisher! Get excited and tip it over on the blind or some dry vegitation and you could have yourself one big fire. Good way to lose your hunting privileges and have a very big bill to pay. If you smoke, please do the land owners and wildlife a big favor - smoke before and after the hunt. We had several acres burned by a hunter who dropped his smoke.