Originally Posted by yuri
In 95% of our homes here the ducts are large and we have very few airflow/oversizing issues. We also size our furnace for extreme cold of -40F or -40C as they meet there. With LOTS of experience I and Carmon can size a furnace perfectly. In a milder climate you can undersize and run them longer but we need the capacity for the extreme cold and older drafty poorly insulated homes. Thats the way it is.
Also with people buying 3 stage and modulating furnaces with variable speed ECM blowers they rarely hit high fire so they are actually not oversized.
Why would anyone want to pay a lot of money for a furnace size they will never use?
like buying a bus for a family of 4
We are in a more cooling climate and in our area cooling and heating loads are pretty equal. I can see where you are the heating load is greater than the cooling loads and you ducts are probably sized for heating with a higher delta T.
It might be a regional thing, so no offense to you or carmon when I say around my region boneheads here "been doin' this for xx years....everyone else is wrong, you need 500sqft/ton.....or the other sharp fella that told one of my customers you multiply the square footage by 20%