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The Heat Pump She Suddenly Saw on Every Street

A customer in Hennessey told me, two weeks after I installed a new heat pump in her house, that she could not believe how many heat pumps were going in around town. She said she saw them everywhere. She named six driveways within a mile of her house where a new outdoor unit was sitting in the gravel. I told her, kindly, that those units had been there for at least the last year. Most of them since before her install. What had changed was not the town. It was her. There is a name for this. The linguist Arnold Zwicky coined the phrase frequency illusion in 2005, and recorded the older nickname…

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