Oversized Furnace, Undersized Return Air vents and Low Heat Output.... ??
I just had a furnance "tune-up" done and the HVAC Tech reported the furnance was way oversized and the return grate too small. There are a total of (7) supply vents.
Anyways, for my sized home (1200 sq ft) he recommend a 60k btu furnace. Mine is a 125k btu.
He also mentioned a flow rate of 770cfms. This for the (7) supply vents. (110cfm/vent)
I also noticed a 10" pipe on the return air and the grate upstairs is 12"x 6". Both flow under 500cfm (??).
Would increasing the return air volume (larger return air grate) help with the heat output of our current furnace
Also, with the oversized furnace, would it be beneficial to add supply vents to the basement (no supply vents) Thereby make use of the extra furnace capacity ?