The Dwyer Group Inc. reported a net income of $695,000 for the first six months of 1999, an increase of nearly 500 percent over last year's $140,000.

Burnham Corp. announced its 1999 second quarter sales at $45.6 million, an increase of $8.4 million, or 23 percent, over last year's $37.2 million. Emcor Group Inc., which ranked second in PM's 1999 Pipe Trades Giants list, reported its second quarter results with a net income of $5.4 million, an increase of 47.7 percent over last year's $3.7 million.

Meuller Industries Inc. reported a 29 percent increase in net income for the second quarter of 1999 with $25.4 million, or $0.64 per diluted share. This compares to $19.7 million, or $0.50 per share in 1998.

Service Experts Inc. announced its net revenue for the second quarter of 1999 at $152.8 million, a 48 percent increase over last year's $102.9 million.