At TSI, we believe your comfort experience is imperative. On average, Americans spend nearly 90% of their time indoors. With such a high percentage of your time being spent in conditioned spaces, we make the quality of said air our biggest priority. Whether you're looking to install new equipment, repair something old, or clean the air you breathe, you can count on TSI to get the job done right. Our technicians are union trained, certified, and licensed to provide the best repairs and replacements with high-quality products. We value our community and love serving all Central Illinois residents and businesses.