Some HVAC guys use the term "POS" when referring to (I think) old NG
furnaces with exposed burners and continuously-lit pilot lights.
I think the acronym has something to do with the pilot light, but I'm
Anyone know what the "POS" acronym stands for?
I think the reason the "pros" don't like those old furnaces is that while
they might not be "efficient" they run "forever." The replacement parts
are dirt cheap and the furnaces often go 10 to 20 years without requiring
The "new" stuff (variable speed blowers, electronic ignition control, etc.)
often has a failure requiring a service call every few years.
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