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REVENUES | 12 Months Ended
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Dec. 31, 2018
REVENUES | 2. REVENUES We adopted the New Revenue Standard on January 1, 2018 using the modified retrospective approach. The New Revenue Standard did not have an impact on the amount or timing of our revenue recognition; however, certain payments to customers were reclassified from advertising expenses to a reduction from revenues, resulting in an immaterial impact to the individual financial statement line items of our consolidated statements of income. Results for reporting periods beginning on and after January 1, 2018 are presented under the New Revenue Standard, while prior period results have not been adjusted and continue to be reported under the accounting standards in effect for those periods. Disaggregation of Revenues The following table presents our revenues disaggregated by primary geographical regions and major product lines within our single reporting segment:
Years Ended December 31, |  | 2018 |  |  | 2017(1) |  |  | 2016(1) |
Primary Geographical Regions: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,126,639 |  |  | $ | 3,919,684 |  |  | $ | 3,813,204 |
Canada |  |  | 291,685 |  |  |  | 269,603 |  |  |  | 267,220 |
Mexico |  |  | 128,329 |  |  |  | 152,668 |  |  |  | 140,278 |
|  | $ | 4,546,653 |  |  | $ | 4,341,955 |  |  | $ | 4,220,702 |
Major Product Lines: |  |  |  |  |  |  |  |  |  |  |  |
HVAC equipment |  |  | 67 | % |  |  | 67 | % |  |  | 66 | %
Other HVAC products |  |  | 29 | % |  |  | 28 | % |  |  | 29 | %
Commercial refrigeration products |  |  | 4 | % |  |  | 5 | % |  |  | 5 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
(1) | As noted above, prior period amounts have not been adjusted under the modified retrospective method and remain as originally reported for such periods.
Practical Expedients We generally expense sales commissions when incurred because the amortization period is one year or less. These costs are recorded within selling, general and administrative expenses. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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