Councillor Fran Lister said it was “clearly very distressing” for residents living nearby.
“I remember when this went through planning as a holiday let and we had no objections, as long as it’s not too noisy for the neighbours.
“It’s not fair that the neighbours are feeling this impact,” she said.
The building dates from mid-19th Century and closed as a school more than 70 years ago.
A spokesperson for Halkyn Estates said it had been trying to find solutions and had even preserved some of the original features of the building when it was renovated.
“We spent £1.6m to buy the building and refurbish it – preserving it for the community.
“We even included original artefacts, furniture and school photos from when it was a school in the interior,” they said.
The spokesperson said they understood the noise issue and had installed a shut-off system for the sound.
“We have done everything by the book,” they added.