Revenue Recognition

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Recognition

Disaggregated net sales by major source:

	Years Ending December 31,
	2018		2017		2016
	(in thousands)
Rooftop Units	$	333,105	$	317,414	$	309,641
Condensing Units	18,282		19,276		13,987
Air Handlers	21,905		22,570		19,792
Outdoor Mechanical Rooms	2,408		3,238		4,515
Water Source Heat Pumps	14,660		9,911		5,835
Part Sales	26,732		20,756		20,374
Other	16,855		12,067		9,833
Net Sales	$	433,947	$	405,232	$	383,977

Other sales include freight, extended warranties and miscellaneous revenue.

Disaggregated units sold by major source:

	Years Ending December 31,
	2018	2017	2016
Rooftop Units	15,273	16,003	16,764
Condensing Units	2,007	2,252	1,639
Air Handlers	2,500	2,577	2,114
Outdoor Mechanical Rooms	38	64	65
Water Source Heat Pumps	5,334	2,485	316
Total Units	25,152	23,381	20,898