Mainstream Engineering Corporation manufactures specialised products for heating, ventilation, air conditioning and refrigeration (HVAC/R) technicians. Their product range includes items for moisture and acid removal, drain line cleaning, generator pads, and indoor air quality solutions, all designed to minimise downtime and deliver fast results. Many products originated from research contracts with NASA and the Department of Energy, then reengineered for commercial use and made in-house in the USA. They would be a good referral for HVAC/R service businesses and technicians seeking high-quality maintenance products and educational resources.