Return to the Heating & Air Conditioning Forum | Post a Follow-Up

 o
Can 1 AC Unit Cool 1st & 2nd Floor of 200 yr old house?

Posted by BishBash (My Page) on
Fri, Jun 10, 11 at 15:58

I have a 2100 sq ft, two story colonial built in 1800. The oil furnace and blower push plenty of warm air thru the ductwork to both floors-- it heats up FAST.

Now I want to install central air, hoping it would be easy to add a coil above the furnace and set a 2 1/2 or 3 ton condenser on a pad 4 just feet from the basement furnace.

But more than one salesmen has told me I won't be able to cool the 2nd floor. I have NO returns on the 2nd floor, just the stairwell. The one return I do have is on the 1st floor near the bottom of the stairs.

After considering several costly options, including an attic AC unit, I'm wondering: can't I direct enough cool air to the 2nd floors by closing off first floor vents, or the use of a damper near the head of the ductwork? The next, least costly option would be to add one return from the 2nd floor, though it wouldn't be in the optimum location. First I'd try the system without it.

I've had a two story home before with a single central AC unit, so I know the 1st floor needs to be chilly to keep the 2nd floor comfortable -- but that house did have a 2nd floor return. Anybody with a historic home can understand why I'm trying to make the least invasive (and least expensive) plan work. I can only spend $4000-$6000.

I'm hoping to hear that one unit will be ok, even if not ideal.

thanks


Follow-Up Postings:

 o
RE: Can 1 AC Unit Cool 1st & 2nd Floor of 200 yr old house?

I suggest that you find out about the suitability of using an attic air handler and current ductwork. You may need to under cut the doors about 1 inch to allow for return air. While my home is not as old as your, it does have radiators for heat, and plaster walls and stone foundation. Our main return air is in the ceiling in the upstairs hall and is about 24x36, and unit is above in the attic.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Heating & Air Conditioning Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here