Lenny and Susanne Knese take over leadership from Mike and Nancy Jersa (Susanne’s Father and Mother).
Serving the Mechanical Contractor and HVAC Industry
Join Our Mailing List
Follow Us On LinkedIn
St. Louis Office
1533 Delmar Blvd.
St. Louis, MO 63103
(314) 531-3200
Kansas City Office
7500 College Blvd.
Suite 578
Overland Park, KS 66210
(913) 218-3953
© 2026 • National Sales Company • All Rights Reserved