Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Disaggregated net sales by major source:

	Years Ended December 31,
	2019		2018		2017
	(in thousands)
Rooftop Units	$	349,427	$	333,105	$	317,414
Condensing Units	18,475		18,282		19,276
Air Handlers	24,265		21,905		22,570
Outdoor Mechanical Rooms	1,643		2,408		3,238
Water Source Heat Pumps	25,447		14,660		9,911
Part Sales	33,331		26,732		20,756
Other	16,745		16,855		12,067
Net Sales	$	469,333	$	433,947	$	405,232

Other sales include freight, extended warranties and miscellaneous revenue.

Disaggregated units sold by major source:

	Years Ended December 31,
	2019	2018	2017
Rooftop Units	14,448	15,273	16,003
Condensing Units	1,738	2,007	2,252
Air Handlers	2,372	2,500	2,577
Outdoor Mechanical Rooms	33	38	64
Water Source Heat Pumps	7,716	5,334	2,485
Total Units	26,307	25,152	23,381