How many square feet does this cool?

Thank you for your question. As a general rule of thumb, 12,000 BTU will typically cool a space that is around 400 sq. ft. However, there are several factors that do affect this, such as the climate zone the space is in and how well it is insulated. Please reference our Sizing Guide. If you have any questions, please give us a call at 1-888-377-2850.