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How do i size up a new high efficency furnace and AC unit?

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There is a 'design temperature' for your locale that must be known for the calculations of the 'heat loss' and 'heat gain' of your structure. Here in the Midwest, those design temp are 5 degrees F for winter and 95 degrees F for winter.

Your target indoor temp for summer should be 75 -78 degrees F and the indoor target temp for the winter should be 65 - 70 degrees F.

There are on line calculators that determines your losses and gains as long as you enter correct information as to the type of windows, wall insulation and construction, attic insulation etc. They are reasonably self-explanatory.

Also, you should really take advantage of the free estimate offers of local HVAC contractors to see if they determine the same capacity system is required as you come up with. If not, you will be more readily prepared to ask reasonably intelligent questions about the system you need.

Posted on Apr 20, 2015

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There are factors in estimating the amount of btu needed, insulation, sun facing, windows, and basicaly How to Calculate BTU Per Square Foot

Posted on Apr 20, 2015

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