Waterbed as thermal imager foil??

Anyone ever tried this or heard of anyone who has? Thought it was a novel idea. I built my covert room in the basement under the waterbed. I figure any planes or copters that fly over are use to picking up that heat pattern here since day one. And the bed is set at like 104 degrees or so.

If your bed is 104 and your lights have the basement up near that temp your whole house will glow in FLIR. So will the ground around it. Wonder why theres no snow in your yard?? LOL j/K man

Just to clarify a little. The room is enclosed 6' deep x 8'across x 7' high. 1 600w HPS on 12/12. The room temp is upper 60's to low 70's. And there's still snow in my yard, wise ass, lol.