Town chairman David Bosomworth is optimistic Harvey can guide the club to safety after making him Halifax’s third manager of the season.
His first match as permanent boss is Halifax’s Boxing Day trip to Lincoln, with The Shaymen six points adrift of safety in the National League.
Bosomworth says it was vital to appoint someone before the start of the transfer window next week and praised Harvey’s impact since replacing Kelly last month.
“In the short-term he’s changed the results around, with three wins and two draws,” he said.
“We’re getting close to the transfer window now and we felt it was important to get the manager in before then.
“He understands the players and knows what we’ve got at our disposal.
“He understands training and he’s up for the challenge.
“Now is his chance and we’re positive about what the outcome will be.”
Bosomworth is now calling on the Town supporters to get behind the manager, with The Shaymen hosting a festive double-header against Wrexham and Lincoln next week.
He added: “There’s a lot of hard work ahead of us and we need the fans to get right behind us now, starting with our next two home games against Wrexham and Lincoln.
“It’s important they turn out in big numbers and cheer us on because we need their support.”