Replynot particularly...especially if your refering to equally efficient furnaces and thats the input amount
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difference of 3000btu's furnace
is there a substantial difference between a 88000 btu lennox furnace vs. a 91000, it is a small amount but I want to be sure.
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not particularly...especially if your refering to equally efficient furnaces and thats the input amount
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Anything less than 20k BTU difference is not substantial IMO because most manufacturers make furnaces in 20k or 25k differences.
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The choice of furnace should always be predicated on an accurate Manual 'J' load calculation. That should include both heating and cooling loads so that the appropriate blower can be matched to the furnace. Many furnaces have several different blower options and matching the heating Btu's but ignoring the cooling airflow can be a recipe for disappointment if someone later tries to add AC to an existing furnace. Manual 'J' is the best way to establish the needs.
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