Contact Haas Systems Physical Address: Haas Systems 57140 Woodhouse Dr Dowagiac, MI 49047 Billing Address Haas Systems PO Box 624 Dowagiac, MI 49047 Phone: 888.782.5530 Phone (Locally): 269.782.5530 Fax: 269.782.5530 Website: www.haassystems.com Directory extension list. Call 888.782.5530: Eric Haas - Communications - extension 119 Stephanie Holloway - Operator Services/Billing - extension 102 Chris Carlson - Security - extension 117 Scott Green - Technician - extension 135 Bailey Haas - Technician - extension 108