It was a relative who found the pair and alerted police shortly after 1pm on Saturday.
Police said that there was a suspicion of crime.
"We have opened a murder investigation," Veronica Andersson of the local Västernorrland police told the Aftonbladet newspaper.
Andersson refused to divulge any details about the deceased pair.
The police added in a statement that there was "no suspicion that an outsider was involved", though did not go into further detail.
The home has been cordoned off and the family of the deceased have been notified.