Andrew Griffith, MP for Arundel and South Downs, said he had heard examples of his constituents having booked heating oil orders cancelled.
“These are often the most vulnerable people, living often on their own and far away from the town,” he told BBC Radio Sussex.
“I don’t want to tar every business with the same brush by any means, but there is some profiteering.”
The Conservative politician called on the government to create a price comparison website for heating oil so consumers could shop around.
He pointed out heating oil prices also lacked a price cap, in contrast to electricity.