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  1. #1
    Join Date
    Apr 2008
    Location
    Corpus Christi, Tx
    Posts
    1

    Need new AC in south Texas

    Greetings all,

    I have done a ton of research and am more confused now than when I started. I have a two story house built in 1967 in Corpus Christi, Tx with a 600 SF upstairs and 1200 SF down stairs. The house has not cooled well since I got it a year and a half ago. Last summer I just closed off all the vents and doors upstairs and did not go up there and the downstairs was ok. This last winter my sister-in-law moved in upstairs and I need to fix the AC to be able to cool both spaces adequately. The system I have now consists of a 14 year old Carrier evp coil (CD5BXA036000AAAA) and gas furnace (58PAV070-12) and an 18 month old Payne compressor (PA13NR036-C), the previous owner replaced the compressor when we bought the house. I have had 5 companies out to inspect the system and give quotes. They have ranged from replacing the old evp coil downstairs and adding a 2nd 1.5 ton 13 SEER unit upstairs $,$$$, to replacing the whole down stairs unit with a Carrier Infinity 21 SEER 5 ton unit with zone damper system, BIG $$,$$$. None of the companies have offered to do a manual J on the house and when I asked one of them about it they said that they only do it for big jobs or commercial use and proceeded to tell me that I needed a 5 ton unit because it was 1 ton per 400 sf. All I really want is for the whole house to be comfortable and to control the humidity in the house. I am not sure what my best option is at this point. Should I just patch up the system I have now and add a second unit upstairs or should I go with a larger unit with a variable speed fan and two stage compressor? Finance is a big concern but on the other hand I do not want to spend money over and over again to keep the system working. Any help would be appreciated.

    Chris

  2. #2
    Join Date
    Mar 2008
    Location
    N Texas
    Posts
    67
    You have sereral issues here. Bein' that your new here, look through several of the older threads and you'll find that "load calcs" are necessary and in my company MANDATORY. Keep looking for a contractor who will do the calcs PROPERLY.

    You have a 3Ton system now and it is not doing the job for both levels, but when you close off upstairs downstairs is tolerable -- HMMMMM? How did the second story come into existence? Was it part of the original construction design. I don't think so. My guess probably added/carved out later and existing AC was ducted into new space.

    Single system with out zoning will always leave the upstairs hot (heat rises). Either consider one system properly zoned for up/down or consider two seperate systems. Existing system is 14 yrs old -- your living on borrowed time. This system merits replacement consideration based on age and efficiency alone. Proper zoning should cost less than 2 systems installed, but only slightly less. There are merits to both approaches.

  3. #3
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151

    Confused

    I would not consider a contractor that would not do a heat calc. Old house, any updates to insulation, windows, etc. would make a tremendous difference in what type of system/systems would suit your needs. A two story house always presents a challenge for heating/cooling. A good contractor doing an onsite could give you the best advice if He/She is worth his salt. Good Luck!

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,808
    Click on the link in my sig. Its a link to a map, their may be a contractor from this board near you listed on it.

    We have several from Texas.
    A load calc should be done. Unfortunately many companies won't, or don't know how to do one.
    You may wish to call some more contractors. But screen them on the phone. If they don't do them, don't waste theirs or your time.

    Your duct system may not be big enough to handle a 5 ton unit. Your furnace only has a 3 ton drive in it, I find it hard to believe that your ductwork is sized to carry 5 tons of cooling.

    If the 3 ton cools the first floor ok, and is running reliable. You might want to consider just installing a 1.5 ton for the second floor.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,308
    Contact these people and tell them Al in Houston told you to call.

    http://www.aireserv.com/corpuschristi/default.aspx

  6. #6
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,065
    We have several members from the humidity capital of the US. http://www.ccac-ac.com/ David Mathews - Owner Tom Mooney Tech Sales Have fixed hundreds of homes in CC TX. Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  7. #7
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,545

    Talking what he said

    Quote Originally Posted by classical View Post
    Contact these people and tell them Al in Houston told you to call.

    http://www.aireserv.com/corpuschristi/default.aspx
    I know this man, he is a good man...........met him in Waco.
    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  8. #8
    Join Date
    May 2004
    Location
    Austin, TX
    Posts
    1,732
    I know Corpus well, tons of humidity, and wind. I do not know your home,
    but from what I know you should go with 400 to 500 sq ft per ton. Again
    remember I have not seen your home, but would put a 1.5 ton upstairs
    and leave the rest as is.

  9. #9
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,308
    Quote Originally Posted by edward301 View Post
    I know Corpus well, tons of humidity, and wind. I do not know your home,
    but from what I know you should go with 400 to 500 sq ft per ton. Again
    remember I have not seen your home, but would put a 1.5 ton upstairs
    and leave the rest as is.
    Are you serious!!!

  10. #10
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    705

    Hey you Texans...unrelated.

    Thinking about retiring to the hill country of Texas any ideas.

    Freezin in Minnesota.

    MA

  11. #11
    Join Date
    Jan 2004
    Location
    Burleson, Texas
    Posts
    1,741
    Quote Originally Posted by BadgerBoiler MN View Post
    Thinking about retiring to the hill country of Texas any ideas.

    Freezin in Minnesota.

    MA

    IMO, stay away from the Austin area go farther west or Northwest....

  12. #12
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,308
    Quote Originally Posted by BadgerBoiler MN View Post
    Thinking about retiring to the hill country of Texas any ideas.

    Freezin in Minnesota.

    MA
    What are you looking for; yeah stay away from Austin they think they are in California there.

    New Braunfels is very nice especially if you like German food and heritage.

    Marfa & Alpine are nice small towns in the Davis Mountains if you want to be near a lake Amistatd and Falcon are on the border.

  13. #13
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Posts
    705
    Definitely don't want California, that's why I quit looking in Montana - too many Bistros - German is good, the wife is full blooded. I want a good place to shoot, hunt and fish.

    Might have to brush up on my solar and geothermal skills, not much radiant floor and boilers in the Texas I've seen.

    Looking at Boerne, Mason, Fredricksburg? NW of San Antone area I guess.

    MA

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