Thanks so much for your super quick response
Will definitely take your advice on the smaller splits ... like I said in my post we have tried everything from smaller splits to large ones that took up the whole space! Today we ran it fully open, thinking if we did not choke down on the air at all it might improve.
I would think regardless of split size that if we kept a roaring fire going that it could heat 500sqft past 72 on a normal fall day?! The room that it is in has all new windows and the house for its age is well insulated.
Curious, how hot does the air feel that comes out of your blowers?