some rooms get more air than others

Old 07-10-12, 09:27 AM
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some rooms get more air than others

We have central heat and air in our home. Some rooms get much colder/hotter than the other rooms. We have opened the vents in all the rooms so that is not it. Is this something I can fix or do we need to call someone.
Old 07-10-12, 09:43 AM
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Welcome to the forums.

What's different about the rooms? Like what's under/above/next to them, how far away are they from the furnace, how many vents in the room vs square footage of the room, ceiling height,.... Also, what's the airflow feel like at all of the vents?
Old 07-10-12, 03:39 PM
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Your not alone in this. You have duct issues. Over 95% of homes have this. If your builders hvac guy installed the system this is what you get liw bid = low quality. You should call a good hvac company. They will have to do a heat load first to fiqure out what's wrong.
Old 07-12-12, 02:33 PM
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After a Home Energy Efficiency Audit & retrofit work, all duct systems should be engineer designed using Manual D.

Your duct system should also have been installed with dampers on each branch take-off so you could manually balance the air flow.

It is very important to try to get enough Return Air filter area so the initial velocity through a clean filter does not exceed 300-fpm velocity.

A 3-Ton A/C needs at least 1200-CFM / by 300-fpm = 4-sq.ft. of free-open air filter area (Ak) as listed on Hart & Cooley website.

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