High-pitch noise in all devices.

Hello guys, I usually do intensive search when I have a problem, but after 2 days I've given up and here I am asking what is happening. So here is the story: about two weeks ago we installed a heat exchanger in our house (to heat the house up in winter), and right after switching it up, almost all the other devices make a high-pitch noise (computer/tv/ anything with a transformer). When we switch the heat exchanger off, the noise stops, any ideas what exactly causes that noise, voltage fluctuations or what?



Submitted November 30, 2017 at 08:22PM by WexHex http://ift.tt/2niMtZi

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