An Alberta man living in a camper trailer has died, likely of carbon monoxide poisoning, just days after a couple living in a school bus near Edmonton suffered a similar fate.

The body of the 38-year-old man was discovered Sunday in Bonnyville, northeast of Edmonton. A small camper trailer parked in a yard had been the man's home for several months, according to police.

He was using a propane heater to stay warm, but there wasn't proper ventilation and the man probably died as a result of carbon monoxide poisoning, RCMP said.

On Thursday, two people who were living in a broken-down school bus were found frozen solid in Spruce Grove, west of Edmonton.

Police suspect they also died of carbon monoxide poisoning from running a propane heater inside the vehicle.

With Alberta in the midst of a cold snap, RCMP are advising people to be extremely careful when heating buildings or trailers with propane or other fuel heaters and to use carbon monoxide monitors.

"These heaters need adequate ventilation when in use, if not, carbon monoxide levels will rise to fatal levels within the structure they are being used in," said police in a release.