Create a detailed illustration of a solar heating mat placed inside a window frame. The mat is made of a special black material designed to absorb sunlight and convert it into heat. It is flexible and fits snugly within the modern white aluminum window frame. Sunlight streams through the window, hitting the mat and causing it to warm up. The room is bright and filled with natural light, with a view of green trees outside. Inside, the space looks cozy and inviting, with a comfortable chair near the window and a small table with a cup of tea. The overall ambiance suggests an eco-friendly and sustainable lifestyle, highlighting the efficient use of solar energy for home heating.