I know the electric bill increases when you have reptiles, but I still don't know if I completely believe that reddit story. Reason being grow lights are 100s of Watts, compared to heat mats being down between 5 and 25 watts. A thermal imager doesn't look at how many watts are being consumed but more at how much heat is being generated. MH lights at 400 watts a piece will put off a much hotter heat signature than a bunch of heat mats. If they were to truly look at electrical consumption and heat signature I don't believe this story. Just looking at power consumption maybe. Also when looking at heat signature there is a big difference between an entire house being used as a growing op and even a large reptile collection. A humans body temp gives off a higher thermal signature then cages with an ambient in the 80s. If I get a chance I will break out our thermal imager at work and show you a comparison.