The Glencoe crypto operation is owned by Bit49, a Colorado-based company. Cody Nelson, Bit49's chief operating officer, said the company has gone to great lengths to respond to the couple's concerns.

"We've done everything we can," he said. "We consult professionals; they say, 'Do this,' and we do it."

Nelson said the company has taken a number of steps to mitigate the noise from its operation, which opened last winter. They're operating fans at lower RPM and have installed sensors that reduce the fan speed in cooler weather when the computers run less hot. Exhaust vents now have hoods and baffles that help diffuse the sound, and the company added an evaporative cooling system to further reduce the need for fan cooling.

Just last week, the company installed a polymer soundproofing blanket along the fence, which Nelson said could significantly reduce noise.

"That was an expensive fence," Nelson said, costing tens of thousands of dollars. "We won't be doing any more of that fence. It would be cheaper to buy their house."

When Bit49's crypto operation first opened, it was producing sound levels of 80 to 85 decibels, which is about the same as a gasoline-powered lawnmower or leaf blower running 24 hours a day. Nelson said the noise is now in the 70- to 75-decibel range, equivalent to a washing machine or dishwasher. The soundproofing blanket could reduce that by 20 decibels or more, he said, and the company plans to retest the noise level now that the soundproofing is installed.

Gould and Olson really shouldn't have any expectation of quiet solitude, Nelson said, given that the land across the street from their home has been zoned for industrial use for decades.

"Honestly, in my opinion, they're making noise because they think we make a lot of money and they think they'll get something out of it by fighting us," he said.

"We're worried about our health. We're worried about our sanity," Gould said. "We feel greatly oppressed."

Said Olson: "I'm just crossing my fingers that this one will go under."