There is an ever-present buzzing noise at certain parts of Twiggs County's Middle-High school complex.
It may not be music to everyone's ears, but at that school, the low hum is the sound of progress.
"It's a complete HVAC renovation. We've pretty much taken the whole system completely out," Mike Harnage with Parrish Construction explains.
The company has replaced it with a new $1.5 million heating and cooling system funded in part through a penny sales tax.
"We started in mid-March and we'll finish up in about two more weeks, right before school starts," he said.
Twiggs Superintendent Elgin Dixon says the upgrades will make the school day more comfortable than the previous 24-year-old system allowed.
"They will be cool when it is hot and warm when it is cold," he said.