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The issue with RF interference is around Pulse Width Modulation (PWM) used to drive power in the heater straps. As you are toggling power on and off, every time you switch power if creates a small power spike that also create an RF spike with multiple RF harmonics. This RF came induce RF noise into USB and other cables if they are in close proximity. The solutions to this are 1) Dont run your heater cables near your USB cables 2) Dont run your camera power and heater power from the same power source.
It affected earlier cameras and cables more than they do now. if you notice lines or bands through your images, then RF interference from your dew heaters could be one source. If you image dont have patterned artifacts through them then dont worry.
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