Founded in 1917 by Henry Eckhardt and James Johnson, Eckhardt & Johnson is New Hampshire's longest-serving mechanical contractor. Through good times and bad, even the Great Depression, Eckhardt & Johnson has survived and grown because of its dedication to customer service and the highest standards of workmanship. Each successive generation of shareholders, carefully selected men and women, upheld those founding principles; we stake our reputation on it. Eckhardt & Johnson began as a residential plumbing and heating company.