Guest Article by Victoria Weber
Hünfeld's mysterious whistling finally traced to a faulty heating system
For months, a mysterious whistling noise had been heard in Hünfeld's city center—particularly around Lindenstraße and Josefstraße. The sound appeared irregularly, lasting only a few seconds at a time, making it difficult to pinpoint.
Now, the source has been found: a heating system in the basement of a mixed-use residential and commercial building at Großenbacher Tor was responsible for the whistling.
"We're very relieved that the noise has been located," says Mayor Benjamin Tschesnok. Over the past few weeks, city utility workers had inspected several buildings, including the transformer substation on Lindenstraße, but the culprit remained elusive. Even the heating system in question had been checked recently—with no issues detected.
Last week, the city of Hünfeld commissioned a noise measurement station to investigate the whistling and track its origin. Scheduled for installation in May, the equipment can now be canceled.
One of the most persistent investigators was Olaf Brinkmann, a regional reporter for Hitradio FFH covering East Hesse. Alerted to the problem by a resident on Josefstraße, he repeatedly searched for the source. Just days ago, he and a team from Würzburg-Schweinfurt University of Applied Sciences visited the site, using an acoustic camera to try to capture and locate the 800-hertz tone—without success.
However, when the radio station later shared a video of the search on social media, viewers flooded in with theories about the noise's origin. A tip about a similar case in Dortmund provided the breakthrough: a gas heating system was likely the cause.
In Dortmund, though, the noise had been constant—not intermittent, as in Hünfeld—making it even harder to track down. Then, on Friday, Brinkmann noticed that smoke from the chimney of the building at Großenbacher Tor intensified whenever the whistling occurred.
"It sounded like Grandma's old whistling kettle," the reporter wrote. That observation finally led to the source.
The heating technician responsible for maintaining the system—contracted by the city's utility company—is now working to resolve the issue, so the noise should soon be silenced for good. Ironically, the building's own residents had never even noticed the whistling.
