The Catamounts (14-7, 7-2), who won for the fifth time in six games, led 22-21 at halftime. Voelkel was the lone Catamount in double figures.
For Hartford (11-10, 4-4), Mark Nwakamma was the only Hawk to score in double figures. He also finished with 12 points, hitting 5 of 10 shots from the floor.
Voelkel, meanwhile, was 3 for 5 from the field, including a 3-pointer. He was also 5 for 6 at the foul line, where Vermont went 10 for 17. Hartford hit just 4 of 10 at the stripe.
The Hawks hurt themselves badly from long range, finishing 5 for 29 on treys. Wes Cole was 1 for 8, while Yolonzo Moore II and Nate Sikma each went 1 for 6.