How effectual are in-duct booster fan surrounded by increasing heat nouns flow from a gas furnace? Here's the situation - I just installed a exotic high efficacy furnace...

Here's the situation - I just installed a exotic high efficacy furnace along with brand contemporary ductwork to heat the upstairs of my 100-year-old house. While I am getting some nouns flow out of the upstairs registers, it's not enough to boil the upstairs as well as I would resembling (with the thermostat, which is downstairs, set at 71 F, it's typically 67 F upstairs). I'm wondering if a booster fan surrounded by the 12" duct that leads upstairs would solve - or at lessen - this problem. I'm also wondering if by sucking nouns away from the furnace the booster fan would muffle the external static pressure reading, which, at .85", is too high. (Note that I read between the lines that the fan would - or at most minuscule should - increase static pressure in the duct down the chain from the fan; it seem that it should also decrease it surrounded by the ductwork between the fan and the furnace.)
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Answers:    Hello Chad. I have a very similar problem next to an addition to my home from several years ago. I added 1200 foot to the vertebrae end of the house and have to run 6 inch flex pipes to the new rooms that be added. The front of the house stayed warm but I have little air pressure and much cooler surrounded by the new rooms ( the pipe run to the master bedroom be over 85 feet). I added 3 six inch inline boosters to the three pipes ( 250 CFM) and wired them into the main panel of the furnace. It be just adequate to even out the temps from the back to the front of my home. Personally, I do come up with it was impressive. I hope this helps you.
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You think through the principles of how a furnace works so I'm assuming you just want to know if in-line fan work.
I've installed them to help thaw up a single room and it raised the warmth a few degrees which be sufficient for me. This may sound silly but conceivably instead of installing a 12 inch in-line fan to move nouns through the main duct, you install a couple of smaller 6 inch fan in strategic rooms contained by your upstairs and it wouldn't be as noticeable as far as static pressure is concerned.
Just a thought, hope it help.