Placement of support columns lower than a single floor home? I have a 24x60 single floor fish farm style home and...

I have a 24x60 single floor fish farm style home and I want to beef up the main support floor joist because it is sagging.
How masses feet apart should I place the support columns?
Thanks.
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It depends on the nouns it is carrying. There are charts to determine spacing requirements for support beams.
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How would you save cool?
One support column could be ample.

Consult with an plot or architect.
Obtain a building permit.
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Answers:    This is difficult to answer in need knowing the dimensions of the main floor joist. I suggest you have an architect or obtain have a look.