Don't let painters and sheet rock guys mess up your heater!

The OEMs say no:

On those rare occasions where they say yes, the list of requirements is so long that those requirements are never met:

If you do let them run it during construction, the following will happen:

That is actually a very mild case of drywall dust contamination.
And this is only the part you can see. The cooling coil and heat exchanger may be fouled as well.
I have seen instances where the inside of the furnace looked like it had been through a snow storm.
Drywall dust is a mineral. It makes an excellent abrasive for screwing up motors and circuit boards.

Incidentally, I'm not Bob. I'm John. This is Bob [not to be confused with this Bob. :-)].

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