They haven’t even finished up their bachelor’s degrees, but University of Maine students and twin brothers Matt and Pat Brann already appear to have cornered the market on Bangor’s nightlife.

The 24-year-olds from Hampden own one of the city’s newest clubs, Club Gemini on Harlow Street. The name is appropriate because Gemini is the Zodiac sign for twins.

The pair always had dreamed of owning their own business and since the club opened March 18, the Branns are finding out that business is good. On Fridays and Saturdays especially, the club typically is jampacked with people from all ages and all walks of life, which means the brothers rarely get a break.

“We’re definitely having a blast and we’re learning as we go,” Pat said recently from the empty club where he and his brother enjoyed a quiet moment.

“It’s way more work than we thought it would be, especially since we’re still trying to finish school,” Matt admitted. “But we couldn’t pass up the opportunity.”

The Harlow Street site, tucked in along the bank of the Kenduskeag Stream, formerly was home to the Spectrum, a Bangor nightspot that was known for many years as a gay bar. Since the Branns took over, the space has undergone extensive renovations and the brothers said more could be on the way.

“Right now, things are changing all the time,” Matt said. “Really what we’re trying to do is bring to Bangor what it’s been lacking.”

And Bangor is lacking plenty in terms of nightlife, they said. Indeed, the city has few nightclubs in the traditional sense of, say Portland’s Old Port, where bars and clubs are clustered among cobblestone streets and all are within walking distance of each other. Bangor, on the other hand, doesn’t have an area known for its nightlife.

So Gemini would fit in perfectly in the Old Port or on Boston’s Landsdowne Street, where patrons waltz in and out of bars with abandon, searching for the perfect fit. But in Bangor, the club seems a little out of place, especially from the inside.

A rectangular open floor plan spills into a dance floor, which is set apart by two partitions where patrons can set their drinks and watch the dancers until they gather the courage to go out on their own.

The floor is hardwood, expect for black and white tiles on the dance section. The walls are faux brick. There are no windows and the ceiling is exposed, giving Gemini a basement-like feel, but the ceiling is high and it’s spacious enough so patrons don’t feel claustrophobic.

“We’re near capacity every night, but it never feels like we’re packed in,” Pat said.

The horseshoe-shaped bar takes up a good portion of a side wall, where a colorful cluster of hard liquor bottles peeks out behind fresh, empty glasses and beer taps. Another cash bar sits at the back wall where patrons can order from a limited selection without waiting in a line at the main bar.

The Branns readily admit they are not business experts, but they know what they like and they know how to sell it. They advertise a little on local radio stations but said they haven’t really needed to; word of mouth has been the biggest asset.

“It’s still new, but down the line we could be looking at more advertising,” Pat said.

The brothers grew up not far from Bangor and like many twins, it was hard to tell them apart. Both attended Hampden Academy and then UMaine. While they were in college, both worked at Margarita’s in Orono, gradually earning the trust of management while their responsibilities increased.

They also spent six months in Florida, where they worked in a variety of nightspots. All the while, their minds were turning over ideas about what they could bring back to Maine.

“We like Maine the way it is, but we got to thinking ‘where’s the enthusiasm?” Matt said. “It seems like the city shuts down at 10 p.m. … There is no reason Bangor can’t offer entertainment later at night.”

If the Branns have a weakness, it might be that they have too many ideas. They haven’t defined their demographic, which means the club draws from many different categories of age, social status and lifestyle. But for now, that’s fine with them.

“The crowd tends to get younger as the night goes on, people seem to like to end up here,” Pat said. “But, the great part is, we can hold so many people.”

“I think we can make it even bigger,” his brother added.

The Branns got the money to lease the club in part by mortgaging a house left to them by their grandparents, but they found out quickly that the costs started to add up.

“Just for the licenses, I think we spent more than $2,000,” Matt said.

If crowds are any indications, the Branns are more than making their money back. But more crowds also have translated into noise complaints and Gemini has reached the radar of local law enforcement. The Branns said their relationship with the city has been good so far, and police agree, but still are keeping eyes on the club.

“If [club owners] refuse to work with the police, I think you’ll see the city begin to impose some tighter restrictions on liquor licenses or special amusement permits,” Bangor Deputy Police Chief Peter Arno said.

Already, the city has adopted a loitering ban largely as a result of increased traffic in Gemini’s parking area. The ban affects the upper Abbott Square and Haynes Court parking lots, but not the lower Abbot Square parking lot, or the one closest to Club Gemini, which owns no parking spaces of its own.

Gemini also was the focus of a recent City Council subcommittee meeting that looked at ways to mitigate noise and other problems connected to the Harlow Street site.

“We’re going to have our problems with noise and fights; it’s inevitable,” Pat said.

But Gemini doesn’t have much competition right now and its problems might be magnified. Its effervescent young owners said a lack of competition could be a bad thing in the long run.

“We’re always watching other clubs in the area,” Matt said. “Competition is good for the entire community.”