Indoor air quality is a crucial aspect of maintaining a healthy and comfortable living space. Poor air quality can lead to the development of respiratory problems, allergies, and other health issues. In San Jose, where outdoor air pollution can have a significant impact, ensuring proper indoor air quality is especially important. One essential factor in improving indoor air quality is the selection and maintenance of appropriate heating and air conditioning systems. Here, we discuss the role of heating and air conditioning in San Jose in indoor air quality and explore some ways to ensure clean and fresh air inside your home.