I had Keith in to do a tuneup/duct cleaning on a home I recently purchased/post renovations. I've used him before, but I've never met him in person until recently.
I was a little surprised at first, but there is absolutely no doubt that his attention to detail is top knotch and he takes pride in a job well done. I can only imagine the more swearing I heard meant the value I was getting was increasing.
No BS, absolutely blunt, focused on making sure the job is properly completed and willing to explain what he's doing/toss in a few furnace tips as he goes along. IMO, it's a little old school, but awesome.
He's definitely the first guy I'll be calling for furnace upkeep going forward.