I wonder at what heat signature they start getting bothered, you see melted roofs in the winter etc, never good. I keep my whole garden inside a 2" poly box with HDF foam mats two layers thick on the roof for a 250W draw, it's workable. I have at least three small airfields within 15miles and have unmarked choppers and Cessna type aircraft flying over all day.
It's those smart meters that you want to avoid, EDF and B.Brother in your house 24/7.