Where was Swelter filmed?
2014 film
Swelter (2014) was filmed in Piru, 1 place named in its Wikipedia article's Production section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Towns & cities
Piru
United States
Census-designated place in Ventura County, California
“Though set in Baker, Nevada, the film was entirely shot in Piru, California per the DVD credits.” Wikipedia
Also shot in these places
Happy, TexasComedy film1999