hey shellshock, my father's in-floor heating tube system had some cheap plastic part bust (maybe a fan or something, dunno, didn't pay too much attention) and it caused the whole thing to tear itself apart (motor, computer, etc). cost like $600, or maybe $1000. he was real pissed about it. maybe you should let your friends at big hvac know so they improve the quality of the plastic part.
if you need the name of the part, i can get him to tell the story again and i'll pay attention this time. he loves to tell the story.