From the furnace closet cometh a sharp, metallic rattling-intermittent yet persistent. Is it the pump? Is it the pipes? Is it as Sam theorizes Tommyknockers? Or my own theory, that Spyware/Malware got installed on the furnace and it needs a scan and clean done.
I guess I will know more after my Landlord takes a look at it, and a listen.
Update- Under certain circumstances, it appears that air in the pipes can sound like a sack of marbles rolling down a tin roof- strange but true
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