Lennox International Inc., Dallas, TX, announced that its 1999 net income increased 39% to a record $73.2 million, up from $52.5 million in 1998. Earnings per share were $1.81, a 23% gain over $1.47 in 98. The pro forma calculation, assuming a January 1 initial public offering (IPO), shows earnings per share increased 28% to $1.69 in 1999 from $1.32 the previous year. The company said sales for 99 increased 30% to a record $2.36 billion from $1.82 billion in 98.