Investigators are trying to figure out what started a house fire in Holden that sent the homeowner to the hospital. It also took crews from eight departments to finally knock it down.Firefighters from Holden, Bangor, Brewer, Dedham, Eddington, Hampden, Milford and Orrington were called to Balsam Drive around 11 this morning. Crews found heavy flames in the basement and the homeowner outside, trying to fight the fire, too.Assistant Fire Chief Ryan Davis says crews had a tough time in the beginning and had to back out of the building after the first floor caved-in.”We weren’t getting at it because the floor had collapsed and the fire was underneath the floor, which then spread up through the house. And we couldn’t really get a direct attack on the fire, which meant we had to go into a defensive operation and pulled everybody out and just fought it from the outside.”Davis says crews also had to work hard to get equipment to the house, which was at the top of a snow-covered hill. Water had to be trucked in from a mile away, too. We’re told the homeowner was taken Eastern Maine Medical Center in Bangor to be treated for smoke inhalation. His name and condition have not been released. Davis say the house is a complete loss. Firefighters are expected to remain there for much of the evening, putting out hot spots.