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HOME ABOUT WHAT WE DO CAREERS UNION DIRECTORY CONTACT MEMBERS More. Looking for a REWARDING CAREER. HEAT FROST INSULATORS LOCAL 41THE MECHANICAL INSULATION PROFESSIONALS PROVIDING technical SERVICES THAT MAINTAIN A CLEAN AND SAFE COMMUNITY FOR ALL OF US. For more than 80 years our highly trained and highly skilled insulation professionals have been safely and expertly providing insulation industry services to the West Central Ohio and Northeast Indiana region.