The two refrigeration units being replaced came with Air Force One in 1990 and are different from at-home refrigerators and the "coolboxes" found in other planes.
The complex "bespoke equipment requirements" of the plane's interior design and electrical system are said to be the reason behind the massive pricetag - and not just price gouging on behalf of Boeing, Defense One first reported.
"It's not a contractor issue, it is a requirements issue", said Richard Aboulafia, vice president of analysis at the Teal Group consulting firm.More news: Swedish IKEA founder Kamprad dies at 91
Although the new fridges will use standard industry technology, they have a unique capacity to provide about 70 cubic feet of cold storage, meaning crews will not have to re-stock for extended periods of time.
The current refrigerators have not been updated since 1990, when the two aircraft were introduced.
Previous senior consultant to President Barack Obama Eric Schultz derided the high sticker price in a tweet on Friday, saying, "we would have been reprimanded".More news: Z Calls Donald Trump a 'Superbug,' Trump Responds
She added that while Air Force One is regularly maintained, there have been increasing failures with the chillers due to "hot/humid environments". "It's not getting people rich". They will also undergo strict testing by Boeing and the FAA.
In December 2016, about a month before his inauguration, he complained of the expense in a Twitter post that "Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion".
Still, it only took a few days in office, and a trip on the plane, for Trump to change his opinion of Air Force One. "The units depended on the innovation at the time and intended for here and now nourishment stockpiling", Air Force representative Ann Stefanek told CNN.More news: President Moon congratulates tennis sensation Chung Hyeon