According to the Air-Conditioning, Heating, and Refrigeration Institute’s (AHRI’s) historical data, the year of 2005 marked the height of the past 20 years (since 1998) for combined air conditioning and heat pump shipments.
source https://www.achrnews.com/articles/139794-hvac-sales-are-on-the-rise-will-2018-be-a-record-breaking-year
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