Results 1 to 6 of 6
  1. #1
    Join Date
    Oct 2011
    Location
    Colorado
    Posts
    1

    multiple proposals - mismatch outdoor unit & coil

    Hi all- I am getting bids to replace my furnace and A/C, and have received multiple. The proposed vendors are Lennox, Amana, Rheem and American Standard.

    Two of the companies have proposed using a 3.5 ton A/C (outside unit) with a 4 ton coil with the furnace. Both have indicated that this will provide greater efficiency.

    It is interesting to note that in Colorado that Xcel Energy provides tiered rebates for replacing the A/C with a newer and/or more efficient system - but they specifically exclude any rebates for mismatches as described above.

    Can anyone provide comments on the benefits or deficiencies of such a combination?

    Many thanks for any feedback.

  2. #2
    Join Date
    Feb 2011
    Location
    North East Ohio
    Posts
    742
    That isn't a mis-matched system automatically. Look up the combination on AHRI directory and see if it is a good match. We regularly put a larger evap coil on a system for efficiency reasons. Especially with R-410a. Good luck

  3. #3
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    Quote Originally Posted by NCHeat View Post
    That isn't a mis-matched system automatically. Look up the combination on AHRI directory and see if it is a good match. We regularly put a larger evap coil on a system for efficiency reasons. Especially with R-410a. Good luck

    this has been done for many years.

    as long as its an AHRI rated match you're good to go.

  4. #4
    Join Date
    Jun 2009
    Location
    Albuquerque NM
    Posts
    2,476
    I'm not a pro* so I can't give advice, but if I got such proposals and had your concern, I would ask for the ARI certification numbers for these combos. I have a 2.5 ton condenser with a 3.5 ton coil and it is a ARI match.
    Do wah diddy diddy dum diddy do

  5. #5
    Join Date
    Jun 2011
    Location
    Wake Forest, NC
    Posts
    352
    Quote Originally Posted by garya505 View Post
    I'm not a pro* so I can't give advice, but if I got such proposals and had your concern, I would ask for the ARI certification numbers for these combos. I have a 2.5 ton condenser with a 3.5 ton coil and it is a ARI match.
    Hypothetically speaking, of course.
    It's not rocket-science...

    It's electromechanical thermodynamic engineering

  6. #6
    Join Date
    Oct 2004
    Location
    So Cal
    Posts
    3,319
    Many manufacturers don't have 1/2 size coils so a 4 ton coil IS a match to the 3 1/2 ton condenser- especially Rheem.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event