On 12/6/2016 8:17 AM, cln wrote:
I did a quick math on my Furnace. Even when adding the air exchange vents, the air return is not even close to the same as what is fed in the floor vents and such. if I'm generous it may be 3:2 ~ out:return

I'd also like your opinion on if this should be replaced for efficiency?
Furnace is a late 1980 wood/electric Newmac.


One way to balance the heat around the house is to partly close the
vents in some rooms while keeping the others wide open. Doing that, the
ratio just changed.

What is important is having enough opening both in and out to handle the
capacity of the blower so it is not restricted.

As for replacing a 36 year old furnace, good chance you will save money
over time. You'd have to do some comparisons to see if it makes sense.
My oil fired boiler was in need of repair and possible replacement so
upgrading was an easy decision. Payback is about 7 years for me.