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Revenue Recognition (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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