Thermographic cameras, used for thermal imaging, can range in price significantly based on their capabilities, with basic models costing between $3,000 to $5,000 and advanced versions priced from $20,000 to over $100,000. The ability to capture thermal images through walls is highly dependent on the wall material; for example, aluminum or concrete may hinder imaging, while wood structures may allow for better results. No current technology enables true visibility through walls, as infrared cameras cannot penetrate solid surfaces effectively. Terahertz imaging is a developing technology that might offer some capabilities, but it remains expensive and not widely available, with high-end models costing around $450,000. Overall, while thermal cameras can detect heat signatures, they do not provide the ability to see through walls as often depicted in media.