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Thread: Converting from Central Heat to Central heat and A/C - Long Island

  1. #1
    Join Date
    May 2021
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    Converting from Central Heat to Central heat and A/C - Long Island

    Hi,

    I just bought have a split level house(roughly 2000 sq. ft three levels not including attic or garage, hallways) and looking to add central A/C. The house currently has forced heat and A/C's in the wall's. I have a 4 quotes, 2 of which are reasonable, 1 is semi reasonable and one which is almost double. The first three states I can add a coil on top of my 11 year old gas furnace and then add a condenser. The fourth one said I need to do 2 small systems and a coil on top wont fit. He wants to put one in the basement and one in the attic, creating 2 zones. He also stated some ducting would need to be changed and add bigger registers in certain areas. He stated with my current setup the A/C would be on all the time. It's difficult to swallow the cost of the 2 small systems but he stated this was the most efficient and only way he'll do it for peace of mind.

    Is it possible to put a bigger single unit to compensate for the 2 small units and add dampers?

    Thanks for your help!

  2. #2
    Join Date
    Aug 2002
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    Southold, NY
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    I like the 4th one. 2 stories 2 systems.

    That duct work was designed for heating CFM's and probably has little if any insulation. A/C requires higher CFM's that require larger ducts with insulation and vapor barriers to prevent condensation from forming.

  3. #3
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    May 2021
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    Thread Starter
    I understand but itís literally double the price. What kind of insulation does the ducts need?

  4. #4
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    Quote Originally Posted by datsun72 View Post
    I understand but it’s literally double the price. What kind of insulation does the ducts need?
    Properly installed Insulation with a vapor barrier

  5. #5
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    Dec 2010
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    I’d take the bid with two systems. If it’s not in the budget wait till you can afford to do it right. You’ll be happier in the long run.

  6. #6
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    May 2021
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    Thread Starter
    Unfortunately I canít wait, we have no acís in the house. What about a bigger single unit, or put the AC in the attic or move the whole system to the attic? I have seen houses larger than mine with a single unit.

  7. #7
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    Jul 2019
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    Oklahoma home its in the name
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    Quote Originally Posted by datsun72 View Post
    Unfortunately I canít wait, we have no acís in the house. What about a bigger single unit, or put the AC in the attic or move the whole system to the attic? I have seen houses larger than mine with a single unit.
    Walmart usually has cheap window units if those are allowed in your area.

    Sent from the Okie state usin Tapatalk

  8. #8
    Join Date
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    Quote Originally Posted by datsun72 View Post
    Unfortunately I canít wait, we have no acís in the house. What about a bigger single unit, or put the AC in the attic or move the whole system to the attic? I have seen houses larger than mine with a single unit.
    2 stories
    2 systems

    Short on funds....... 1 system for the 2 Nd floor. Do the 1 st next year.

  9. #9
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    Sep 2002
    Location
    Virginia
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    2 systems without a doubt

    THe 2nd story has people complaining all of the time with 1 unit " its too hot up here "

    So you decide ....

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