A Calgary woman who was found inside a Sunnyside home by firefighters is now in hospital in Edmonton recovering from smoke inhalation.

Initially, the woman was taken to hospital in Calgary in critical, life-threatening condition.

She was upgraded but had to be taken to Edmonton for treatment using a hyperbaric chamber.

Crews were initially called to the home in the 800 block of 9A St. N.W. at about 6 p.m.

Firefighters found the woman inside a basement suite during their search of the home shortly afterwards.

Battalion Chief Allan Ball said that crews aren't sure why the woman wasn't able to get out of the home. "The smoke detectors were working, we're not sure why this person wasn't able to egress the building but just so that we get that public safety message out with Fire Prevention Week starting tomorrow, having working smoke detectors save lives and reduce damage."

Three other people from the home made it out safely.

There is no word on what caused the fire, but investigators say there is no evidence to suggest the fire is suspicious.