Home Repair forum - A/c balancing

Author

A/c balancing

Mark Savoy

2006-05-27, 10:21 am

I have one upstairs bedroom that is consistently cooler than the other two
bedrooms. The two warmer rooms are over the garage. A friend of mine
mentioned that this might be fixed by balancing the a/c. I have zoned a/c so
any changes shouldn't affect the downstairs rooms.

I asked my a/c guy about balancing and he asked if I had the cfm ratings for
each room; apparently this is on the blue prints for the house which I don't
have. I am pretty handy and I was wondering if the balancing could be done
without the cfm room ratings. How do you go about balancing the a/c?

Thanks in advance for any suggestions.

Mark

Robert Gammon

2006-05-27, 10:21 am

Mark Savoy wrote:
> I have one upstairs bedroom that is consistently cooler than the other two
> bedrooms. The two warmer rooms are over the garage. A friend of mine
> mentioned that this might be fixed by balancing the a/c. I have zoned a/c so
> any changes shouldn't affect the downstairs rooms.
>
> I asked my a/c guy about balancing and he asked if I had the cfm ratings for
> each room; apparently this is on the blue prints for the house which I don't
> have. I am pretty handy and I was wondering if the balancing could be done
> without the cfm room ratings. How do you go about balancing the a/c?
>
> Thanks in advance for any suggestions.
>
> Mark
>
>
>
Without CFM ratings, without BTUH dissipation for the rooms, it is hit
or miss.

There are several things that can be done

1. Restrict the airflow to the cooler bedroom so that a larger fraction
of the cool air from the upstairs A/C goes to the two warmer rooms. AC
supply houses sell inline adjustable baffles that can easily be inserted
into a AC duct to restrict flow on a branch.

2. Run new, larger diameter, insulated ducting to the two warmer rooms.

3. Get a higher CFM fan for the upstairs A/C.

4. Put more insulation under the floors of the bedrooms over the
garage. Remember that the cool bedroom has an uninsulated floor and
relies on the downstairs A/C to take care of any heat from below.

Goedjn

2006-05-30, 2:21 pm

On Sat, 27 May 2006 13:00:46 GMT, Robert Gammon <rgammon51@yahoo.com>
wrote:

>Mark Savoy wrote:
>Without CFM ratings, without BTUH dissipation for the rooms, it is hit
>or miss.
>
>There are several things that can be done
>
>
>1. Restrict the airflow to the cooler bedroom so that a larger fraction
>of the cool air from the upstairs A/C goes to the two warmer rooms. AC
>supply houses sell inline adjustable baffles that can easily be inserted
>into a AC duct to restrict flow on a branch.
>
>2. Run new, larger diameter, insulated ducting to the two warmer rooms.
>
>3. Get a higher CFM fan for the upstairs A/C.
>
>4. Put more insulation under the floors of the bedrooms over the
>garage. Remember that the cool bedroom has an uninsulated floor and
>relies on the downstairs A/C to take care of any heat from below.

5. Move any furniture that's blocking the supply or return flow
in the warmer room. Take the grill off entirely.

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