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Old 11-03-2010, 06:39 AM   #1
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HVAC Sizing Question


I live in the Peidmont of NC and just purchased a house built in the Late 50's, a Cinder Block house. still has old windows so it gets cold in hte winter. I am replacing hte HVAC Package unit with a new Package heat pump. the house is 1400 square feet. My question is from my calculations the correct size for HVAC would be 2.5 ton ...BUT I think that I neeed to up it to 3 ton. Please advise

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Old 11-04-2010, 08:08 AM   #2
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HVAC Sizing Question


Have your HVAC contractor do a load calculation. Not sure how you came up with 3 Ton, but the correct way is to use Manual J (for cooling) and the corresponding manual for heating. It is a fairly involved process. In the Eastern part of the US, you round down (for cooling) rather than up because of the need to remove moisture from the air.

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Old 11-04-2010, 08:05 PM   #3
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HVAC Sizing Question


I second that suggestion for sure... You can really shoot yourself in the foot when installing a larger unit to an older home as well, as you need more return air for the larger system. Its not just.. "Install a 3-ton"... its Install a 3-ton, add a second return air run to increase the volume going back to the unit so it doesn't turn into a block of ice, and sound like a vacuum cleaner! :-)

Have your contractor run a load is a great way to get it right!
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