I came across a post a few minutes ago about a cardboard box that caught fire & since that was what we were going to use I'm freaking out now because I don't know what to safely use for a brooder to keep them warm when we are gone to work. We can come home & check on them once or twice but there's no getting around something having to stay on while we're gone in order for them to stay warm. What do we use?? I read about an EcoGlow but the price is more than we can afford & you still have to plug it in the wall to use. Is there a way to keep them warm & at the temp they need without using something that plugs up? and/or is there a cheap but safe way to keep something plugged in while we're gone? What's an affordable & fireproof type of brooder since cardboard is out now?