Innovation. Efficiency. Sustainability. Since our first customer in 1985, CRT has become an industry leader in developing innovative, green products to fulfill HVAC maintenance needs. We have a full-time, on-site research and development lab and each of our products are independently certified. Our products are connected by a common thread. Each one is designed to work together to extend the lifetime of air handler units by effectively cleaning, sanitizing, protecting and when necessary, resurfacing. This saves you time, labor and replacement costs.