Sadly, not only must industrial controls not emit too much RFI (deep information at http://www.arrl.org/tis/info/rfigen.html ) but such controls must not fail when subjected to bursts from say a cell phone. If your system is affected by a laptop with wifi, then a cell phone is of some 100X more power and the same issue would exist. I'm writing from my background as an embedded controls designer.

I never discount such claims, but I've yet to find this effect in a home system. However it was noted in an elevator control under an unusual condition. The elevator service person had the control panel off, a diagnostics system attached and proceeeded to make a cell phone call. The diagnostic controls picked up the cell phone burst and the elevator in turn got a command from the diagnostic controls... It was repeatable. The fix was to install a shield on the diagnostic system but that was never tested because it's not a normal part of this system.

OK, you've read all that. My reply is this. I'm going to write... doubtful.

Bob