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Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) unit | Dec. 31, 2019 USD ($) unit | Dec. 31, 2018 USD ($) unit
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 116,700 | $ 134,772 | $ 125,596 | $ 137,483 | $ 122,574 | $ 113,500 | $ 119,437 | $ 113,822 | $ 514,551 | $ 469,333 | $ 433,947
Total Units | unit |  |  |  |  |  |  |  |  | 26,231,000 | 26,307,000 | 25,152,000
Rooftop Units |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 400,946 | $ 349,427 | $ 333,105
Total Units | unit |  |  |  |  |  |  |  |  | 15,713,000 | 14,448,000 | 15,273,000
Condensing Units |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 21,149 | $ 18,475 | $ 18,282
Total Units | unit |  |  |  |  |  |  |  |  | 1,920,000 | 1,738,000 | 2,007,000
Air Handlers |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 23,931 | $ 24,265 | $ 21,905
Total Units | unit |  |  |  |  |  |  |  |  | 2,073,000 | 2,372,000 | 2,500,000
Outdoor Mechanical Rooms |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 2,842 | $ 1,643 | $ 2,408
Total Units | unit |  |  |  |  |  |  |  |  | 33,000 | 33,000 | 38,000
Water-Source Heat Pumps |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 19,053 | $ 25,447 | $ 14,660
Total Units | unit |  |  |  |  |  |  |  |  | 6,492,000 | 7,716,000 | 5,334,000
Part Sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 32,561 | $ 33,331 | $ 26,732
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 14,069 | $ 16,745 | $ 16,855

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