The systems and methods described herein are directed to an air purification system that can draw in air from the outside of a structure and purify the air to at least a level that is generally healthy for human inhalation. In addition, the air purification system may function to provide warmer or cooler purified air to the inside of a structure. Furthermore, the air purification system can include a feature to purify circulated air to the inside or indoor space of a structure. The air purification system can also include a solar heating element that functions to increase the temperature of the air purified in the air purification system.