Police discovered a hydroponic cannabis set-up at the home after it went up in flames.

Detective Senior Constable Derek Verity, of the Warrnambool police crime investigation unit, said he attended the Manifold Street property about 7pm after reports of the house fire.

He said once the fire was contained police discovered the property was a cannabis grow house.

"No one is living there and it is being used as a blatant drug house," Detective Senior Constable Verity said.

He said the fire was fully contained to the roof where an electronic bypass system was in place.

Detective Senior Constable Verity said investigations at the property, which had been blocked off to the public, would continue.

He said a neighbour spotted the fire shortly about 6pm on Tuesday.

"He has gone in to have a look, to see if anyone was inside and has suffered a suspected heart attack," the detective said.

"He was not involved at all. He was just a good Samaritan, who has was airlifted to hospital."

An Ambulance Victoria spokeswoman said paramedics were called to the property shortly before 6.20pm.

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"Paramedics treated a man in his 60s at the scene for a medical episode," she said.

"He was flown by air ambulance helicopter to Geelong Hospital in a stable condition."

Country Fire Authority crews were called to the scene shortly after 6.15pm to find the house fully ablaze.

Crews from Camperdown and Noorat helped to bring the blaze under control.

More to come.