Tim Hoysradt has served as Indoor Air Quality Division Manager at Riddleberger Brothers, Inc. since 2017. Prior to RBI, Mr. Hoysradt served as owner and President of Twins, LLC from 1993 through 2017. He has over 43 years of HVAC and IAQ experience including working for various companies as a technician, sales rep, and owner. Tim also served as the National Air Duct Cleaners Association Board Director, Regional Coordinator, and Instructor. From 2005 to present, he’s served as an instructor for Certified Indoor Environmental Consultant, Certified Mold Remediator, and Certified Indoor Environmentalist Classes at Indoor Air Quality Training Institute.

Tim’s training and certifications include: Environmental Control Systems Installer & Servicer, Master Mechanic, NADCA Air Systems Clean Specialists (ASCS), Atlantic Engineering Training Duct Technology, IAQ Training Institute Certification Mold Remediation, IAQA Certified Mold Remediator (CMR), NADCA Certified Ventilation System Inspector (CVI), Certified Indoor Environmentalist (CIE), Certified Indoor Environmentalist Consultant (CIEC), National Institute of Decontamination Specialists – Crime &  Trauma Scene Bio Recovery Technician, NADCA Ventilation System Mold Remediator (VSMR), Indoor Air Quality Association Member, National Air Duct Cleaners Association Member, and OSHA 30.