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the 410 system is sized like a 22 system make the old system wasproperlysized the old unit may have been over sized insure it is sized to the square footage of the house also insure the house has at least R-30 in the attic the old unit may have beenover sizeddo to the lack if insulation in this case you may be able to down size & save money on HVAC equipment over sizing will result in short cycling KILLING your HVAC over sizing will also cost more to operate also insure the walls & floor have insulation as well some houses have duct work in the crawl space check for proper sealing of ducting.

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Q: Does a house need to be sized to replace a R22 system to a R410a sustem?
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