The Hot-Kold was the result of a partnership between the refrigeration company Frigidaire and General Iron Works, which made furnaces. Unaffordable for most people during the Great Depression, it didn’t last long.
Indoor air quality isn’t just about UV bulbs. It’s about humidity, airflow, filtration, and how well a home’s systems work together. For contractors, that’s shifting how they approach IAQ: no longer as a one-stop shop but rather a whole-home strategy that starts with fundamentals.