man thats one of the must paranoid threads i had ever read... at day, a helicopter cant watch under a house roof, or at least, it wont pass over 1 floor, if you are thinking into growing in your basement, its impossible for them to see whats cooking... if you try to isolate the heat, what you are gonna create is an oven, and first you are gonna kill the plants as soon as they pop out, and second you can cause a fire in your house, wich wont be cool at all...

the other thing, to have the fridge the way you want to use it, it dosnt sounds bad ,but i dont know how well will you control the heat...
if you are in probation, be carefull for any serch warrant... dont worry about helicopters, cia, fbi, dea, or even kgb spys... the problem is that you dont pull any suspicios anyhow...
i dont know if i were you i would grow no more than 4 plants in a closet... with 1 hps of maybe 250 wats, and a couple cool fluros..