you can buy heat detector proof mylar it is availabe in uk,also if you are in veg you should only have a few weeks when your lights may be at risk ,eg lights on at 5am going off when its dark heat cameras only affective when there is not a great deal of natural daylight ie a red hot roof from the sun,so when you go in to flower if your lights are going off at 5 pm you should be ok also vent it out the chimney stack if you have heat probs,just core drill the stack in the loft and away you go done it loads of times works a treat hope that was of help