Heating, Air-conditioning and Refrigeration Distributors International reported an 8.2 percent sales increase for December. The annualized growth through December was 5.7 percent.

"The cooler temperatures in the western region was responsible for the boost to sales at the end of the calendar year,” said HARDI Market Research and Benchmarking Analyst Brian Loftus.

The Days Sales Outstanding, a measure of how quickly customers pay their bills, is now at 49.9.