delstu

HVAC 102: Not all HVAC companies follow the designers specifications. They cut corners to cut costs.

Having 2 returns on the first floor and an intake on the furnace itself is not a closed system!

Seldom does a design naturally balance out. There are too many variables in air flow dynamics depending on the type of medium used. That's why vents are adjustable. HVAC systems provide both heating and cooling and often require different vent adjustments depending on the season.

Since you have an open filtered intake on the side of the furnace, intake will always have more capacity than output.

silentdub

Adjust as necessary.

profenx

wow i'm confused. I have central air and heating on same unit. I have vents in every room (even the bathrooms although they are smaller vents) I thought if i closed the bathroom vents and some room vents i will get more air out of other vents like the family room which is bigger and takes longer to cool. I have a large filter in the hallway. is this the intake? or is it the return? what the freak is a return? Anyhow i should leave every vent open? adjust the room vents so that they feel the same temperature and that should improve my system? Cuz it takes forever for the 20x20 family room to cool but my bedrooms cool much faster.

Sorry if this is common sense. Thanks for the advice. I've never heard of keeping the vents open to. all new.

paul52446m

I have been doing heating for 40 years and this is how i engineer a house.
First take a heat loss on every room of the home. This tells me what size furnace i need. Furnaces come with different blowers and speeds. So to get the right blower i need, we use a rule that we find out the cubic of air in each room, and all the air in the home should be able to go through the heating and cooling unit 5 times per hr. so we can properly treat the air. So now we convert heat needed in each room into CFM of needed in each room. From that we lay out our duct system.
We can balance the system, but people have different wants and needs.
You need to move enough air through the furnace so you don't over heat it. You also need to move enough air across the cooling coil so it wont freeze up, But normally turning off 2 or 3 hot air reg. will not effect you system that much. It will just up the static pressure and move a little air out the other open. If you go into a bedroom and shut the door and close the hot air open, when you furnace comes it will pull a fast vacuum on the room and then you will not get any more air flow out of the room.
So in a base in the summer most people will close some of the opening.
In a upper story you have to close the opening down some in the winter, and open them back up in the summer time to cool it. Later Paul

delstu

I became disabled before getting in 40 years as Paul did. Paul obviously did not design your system or it would have at least 1 additional supply line with vent to your family room to properly balance the system.

Not everyone in the business follows the same technique Paul does. I'm sure he has followed behind another company to correct problems many times. I know I did, quite often to correct work done by some of the largest companies in my area.

Scott_W

Hey Guncho, how much did it cost you? Im also planning to buy and install a centralized aircon. Thanks.

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