Upon its release, Siberia Acoustic debuted at number seven on the BillboardCanadian Albums Chart and at number 86 on the Billboard 200, her second-highest peak on either chart at the time. The album received generally positive reviews from contemporary music critics, who found that the acoustic production put emphasis on Lights's songwriting talents but also made the songs less compelling than in their studio renditions.
Siberia Acoustic received mostly positive reviews from contemporary music critics for showcasing her abilities as a singer-songwriter. At AllMusic, reviewer Matt Collar wrote that "although Lights normally makes electronic pop that often features electric guitars, keyboards, and dance-influenced beats, she is at her core a melodic singer/songwriter. Not surprisingly, many of the songs on Siberia... lend themselves to these intimate re-recordings." He rated the album 4 stars out of 5. Brent Faulkner of PopMatters responded positively to Lights' vocals on the album ("Lights sounds superb throughout," he writes) but ultimately felt the acoustic soundscape "fails to compel as much" as Siberia′s original production. "All in all," he summarized before delivering a 6/10 rating, "Siberia Acoustic is enjoyable if sometimes bland."
Conversely, Alex Beebe of Sputnikmusic deemed the new version equally worth the listen and declared the album a "massive progression in maturity" both personally and artistically. Beebe writes that "while most acoustic albums prove to be forgettable and throwaway renditions of infinity superior songs, Lights has shown the proper way to go unplugged and remain just as interesting with Siberia Acoustic." Claire Louise Sheridan of Alter the Press! gave a particularly complimentary review in which she highlights Lights's vocal range and interpretive abilities. "No matter what your previous impressions of Lights may be," writes Sheridan, "cast them aside. Siberia Acoustic is a truly different experience which allows appreciation of the overwhelming beauty of her talent and thus the true basis of her appeal."