Keeping things not too hot and not too cold-that's the tricky task of HVAC techs! Discover how these trained professionals help keep homes cool in summer and cozy in winter, food fresh, and the planet from getting too warm. Learn how you can pursue a career in this in-demand field! With the Skilled Trade Careers series, readers will get an in-depth look into the fascinating skills and tools behind trade careers. This high-interest, lower-reading-level series for young readers describes what it takes to pursue one of these in-demand careers and how dedicated professionals in these fields keep our high-tech world running. Each book features glossary words defined on the page where they appear, boosting reader comprehension and confidence.