NSC Applied Products Group is a division of NSC that was formed in 2013.  We are built on NSC values and the importance of treating customers like friends (because they are).

NSC can trace its early roots to the contracting company, Nabbefeld Heating Company which opened in the late 1930’s.  The company was founded  by brothers John and Joe Nabbefeld. Due to rationing programs of the U.S. War Production Board during WWII, the company was forced to close after basic supplies were made unavailable.

In 1946, the Nabbefeld brothers began a new venture selling to contractors instead of doing contractor work. National Sales Company (NSC) was founded as a wholesale distributor primarily focused on heating products such as steam traps, radiators, fittings, and pipe. John Nabbefeld used his expertise as a pipefitter and relationships with fellow pipefitters and plumber friends to quickly establish a thriving business. Due to the fact that he was of German descent and the existing political climate post-WW2,  John incorporated his U.S. patriotism into the naming the new company National Sales Company and choosing Red, White, & Blue as its company colors.

72
Serving you proudly for 72 years!

History of NSC

Cool Timeline

1938
1938

NABBEFELD HEATING & COOLING

NABBEFELD HEATING & COOLING

The Nabbefeld brothers founded Nabbefeld Heating and Cooling.

1946
1946

NSC IS FOUNDED

NSC IS FOUNDED

National Sales Company (NSC) is founded and established 1st location on West Pine

1960
1960

MOVE TO TOWER GROVE

MOVE TO TOWER GROVE

NSC headquarters is moved to Tower Grove location.

1972
1972

ST. CHARLES LOCATION

ST. CHARLES LOCATION

NSC establishes its St. Charles location.

1980
1980

MOVING ON UP

MOVING ON UP

NSC headquarters moves for the 2nd time to Duncan Avenue in St. Louis’ Central West area.

1981
1981

FIRST AQUISITION

NSC acquires Independent Plumbing.

1982
1982

GOODBYE ST. CHARLES

GOODBYE ST. CHARLES

The St. Charles location is moved to O’Fallon, Missouri.

1984
1984

THE NEW GENERATION

THE NEW GENERATION

Mike and Nancy Jersa purchase NSC from John and Joe Nabbefeld (Nancy’s father and Uncle)

2007
2007

THE FAMILY BUSINESS

THE FAMILY BUSINESS

Lenny and Susanne Knese take over leadership from Mike and Nancy Jersa (Susanne’s Father and Mother).

2012
2012

CONSOLIDATION

CONSOLIDATION

NSC’s Duncan Avenue headquarters and the O’Fallon location are consolidated into one main location on Delmar Boulevard in downtown St. Louis.

2013
2013

A NEW FOCUS

A NEW FOCUS

The NSC Applied Products Group begins as a new division within the NSC family. The strategic focus of APG was centered around a partnership with Samsung and their VRF & Ductless equipment offering.

2014
2014

THE RISE OF APG

THE RISE OF APG

NSC Applied Products Group expands into Kansas City and establishes a small sales office.

2018
2018

BIGGER, AND BETTER THINGS

BIGGER, AND BETTER THINGS

NSC begins construction of NSC APG’s expanded location in Lenexa, Kansas.