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What size central a/c,heater do I need to cool-heat a 2400 sq/ft house in west Texas

I like to run the ducts under the house so the cool air or heat will come from the floor up and go through the house.

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You haven't included enough information to give you an accurate number. Things to consider are:
- R value of attic and wall insulation
-cubic footage of the living area
-are the windows single double or triple paned... low E ?
-how many hours of direct sun?
-how many points of return air do you have?

Its better to over size your system than to undersize.

One more thing to consider.... heat rises, cooled air falls and if you want to run your ducting under the house? insulate the crawlspace walls.

Posted on Nov 20, 2013

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SOURCE: amps needed to run a central air unit

Central air requires a 2 pole 30 amp breaker or fuse. You may be able to get by without it but 200 amp service is recommended.

Posted on Jan 31, 2009

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SOURCE: AC not cooling

first off you should have a four ton unit. what is your super heat? is it pulling attic or outside air?

Posted on May 28, 2010

SOURCE: Air condition unit of sufficient size??

You currently own a 2.5 ton AC Unit
500 square feet equals a ton of cooling/ you need a 3.5 ton unit.
If your home is well insulated, good windows and doors and pretty good
shade that covers your house, then I can see a 3ton unit cooling your
house.

Thats another 6,000 btus you do not have and that is a best case for a
energy effcient home.

Posted on Jul 08, 2010

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Sincerely,
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PS CFM is cubic feet per Minute.

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