Telus already faced complaints when it put in the new $500,000 cellphone tower on a West End building last March. The company said it was needed to meet high demands for cell coverage.
Then, a couple of weeks ago, Telus added a cooling fan for the tower, which has caused more grumbling.
"It's very frustrating, it's just continuous," said Alison Warner, who lives on the first floor with a window facing the fan.
Third-floor resident Andrea Jacques has also complained, saying the fan keeps turning on and off, making her lose sleep even with earplugs.
"If you can imagine having a big vacuum cleaner starting outside your window every five minutes, all night long, it's a little frustrating."
Noise levels within city bylaws, says Telus
Telus has added panels to reduce the sound, and wants to work with residents to come to a solution, said spokesman Shawn Hall.
"We certainly understand where they are coming from," he said. "We want to do what we can do to bring that noise level down."
Halls said a city crew measured the noise produced by the fan and found it within bylaw limits.