Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Disaggregated net sales by major source:

	Years Ended December 31,
	2020		2019		2018
	(in thousands)
Rooftop Units	$	400,946	$	349,427	$	333,105
Condensing Units	21,149		18,475		18,282
Air Handlers	23,931		24,265		21,905
Outdoor Mechanical Rooms	2,842		1,643		2,408
Water-Source Heat Pumps	19,053		25,447		14,660
Part Sales	32,561		33,331		26,732
Other	14,069		16,745		16,855
Net Sales	$	514,551	$	469,333	$	433,947

Other sales include freight, extended warranties and miscellaneous revenue.

Disaggregated units sold by major source:

	Years Ended December 31,
	2020	2019	2018
Rooftop Units	15,713	14,448	15,273
Condensing Units	1,920	1,738	2,007
Air Handlers	2,073	2,372	2,500
Outdoor Mechanical Rooms	33	33	38
Water-Source Heat Pumps	6,492	7,716	5,334
Total Units	26,231	26,307	25,152