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That would depend on a number of things, including the size of your furnace and heat loss rate and size of your home. Example: I replaced a 100,000 btu furnace with a 50,000 btu to heat my 1200 sq ft home. Both do/did the job but the 50,000 is more correctly sized and thus runs longer and cycles less. The 100,000 on the other hand was oversized, cycled more often for shorter periods and as you can imagine the air out of the ducts was warmer than with the 50,000. Bottom line,the proper sized furnace correctly installed will do the job better with less wear and tear on the equipment than an oversized unit. Though the oversized unit will give you warmer temps at the duct outlets. To see if you can raise your duct outlet temps, have a contractor perform a heat rise test on your furnace and if there is room to do so he may be able to give you warmer air temps by slowing down the fan. Be aware, all furnaces have a maximum heat rise rating set by the mfr and this cannot be exceeded, But if by chance you are moving too much air in the heat mode there may be room to slow it down without compromising the life span of the equipment.

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