The policy of "selling" Cornwall as a magnet for second home owners has been criticised by a local councillor.
Second home owners are pushing up Truro prices according to Shelter
County Councillor Mark Kaczmarek has called for the removal of a poster at Newquay Airport urging visitors to come to the county to buy holiday homes.
"Cornwall has a huge problem in providing our own residents with affordable housing," he said.
But Councillor Andrew Mitchell, who oversees the economy, said the county gets 30% of its income from tourism.
Mr Kaczmarek wrote to the authority: "When in the departure lounge at this County Council-owned Newquay Airport building I was shocked to see a very large advertisement poster on the wall offering holiday homes for sale.
"As most people are aware Cornwall has a huge problem in providing our own residents with affordable housing and I strongly believe that this council should not be seen promoting holiday homes in any of our buildings.
"I ask you to remove this offensive poster immediately."
But Mr Mitchell dismissed the call, saying the poster was clearly designed specifically for holiday home owners.
"Cornwall is reliant on the tourist industry," he said.
The housing charity Shelter has criticised the number of second homes in Truro, claiming they have pushed up prices.