Do not see this guy. Depending on where you live the majority of illegal drug production is inteded for gangs. I'm not saying this guy might be in a gang, but he probably knows what the consequences of being caught growing would be. Some people might take this overboard. Nothing would contribute to talking to the person whos house has plants. Resist your temptations of being close to a fellow plant grower and just leave that subject alone. Also, about your temp probs. Completely ignore what I told you and go with what HARDDON said. Lead doesn't allow anything through it and this "nothing" includes the light waves that thermal vision uses. 75 degrees is perfect for your plants so just add the lead drywall completely around your grow area and you'll be fine. Goodluck.