The Soleus Air 12,000 BTU cooling with 10,000 BTU of Heat, extra efficient Inverter compressor and Wi-Fi. Size for extra thick walls up to 12.5" thick walls and sill. Because of Soleus’ industry-exclusive Saddle design, the unit sits low and over the wall, eliminating the chances of the unit falling out of the window and any need to drill holes in the window for support.