Most likely states "Assembled in the USA".
Do you promote your products as “Made in the USA”? Under the law, some products must disclose U.S. content. For others, manufacturers and marketers who choose to make claims about the amount of U.S. content need to know about the FTC’s Made in USA Labeling Rule and Enforcement Policy Statement...
www.ftc.gov
Although two major HVAC manufacturers have plants that "make" HVAC equipment, they can only claim "Assembled in the USA" due to the amount of foreign made parts that are used.
Ironically enough it wasn't until I became intimately familiar with these two manufacturers that I came to the realization that sometimes I would rather have a product actually made outside our country than made in our country (at least when it comes to HVAC equipment).