"We want to show the community what's been done," said fire company president James Herr.
The open house is the first the volunteers have held since they housed their ladder truck in 2003, he said.
The open house will also be an opportunity to publicly thank municipal officials for their financial support and contractors who donated materials and services for the project.
"There was a lot of stuff donated that we would otherwise had to pay for and that would have run the price up a good bit," Herr said. "That doesn't happen other places like it does here."
The station's expansion was completed in 2017.
"We were going to do this [the open house] last year but we wanted to do it when we can have the doors open and that wouldn't have worked in the colder months," he said.
In September, 2015, the volunteers voted to build an addition onto the south side of the State St. station. The decision came after structural engineers determined that the floor of the original portion of the station was not strong enough to hold the two engines housed there.
That part of the fire house was built in 1932 and was constructed to hold engines weighing seven to nine tons. The company's two engines, neither large by modern standards, weigh about 17 tons each. Their weight was causing the concrete floor to flex.
The new addition is the second the volunteers have had built. The first was constructed in 1974 to house a tank truck and a ladder truck, both too large for the original fire house.
The firefighters moved into the expansion last year. It allows the firefighters to keep the heavier equipment on solid floors and made room for lighter equipment like the command vehicle and fire police van to be moved inside. Prior to that, those vehicles were parked outdoors.
The open house will be held at the station, 217 E. State St., from 6 to 9 p.m. on Thursday, June 14. There will be apparatus tours, live demonstrations, rides in the bucket of the company's ladder truck, and a candy drop. A smoke trailer will also be open. The trailer, which has rooms similar to those in a house, can be filled with non-toxic smoke to help adults and children learn how to safely escape a burning building.
The open house will be held rain or shine.