Gas Furnace Sizing

QUESTION:

On the very coldest mornings of winter my furnace runs less than 1/3 of each hour. The a/c people said a smaller furnace would be quieter and give more even heat. They are proposing installing a new furnace about 1/2 the size of the current furnace's output. Would this be big enough? Current furnace is 100,000 btu Input / 67,500 output. A _lot_ of insulation, caulking and new windows have been added since the old furnace was installed.
I offered to have a manual-J (?) done, but nobody here will do that.

ANSWER:

That doesnt sound like too long of a run time actually. A new more efficient unit might save you money but why would you just let someone guess as to what size your house needs? Tell the bums to get the hell out of your house if they are too lazy to do a proper Right J load calculation on your home. A competent company will be happy to do it for you


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