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I am house hunting in Houston. Every 2000-2004 house we've seen so far uses old A/C Unit and coils for R-22 Freon and not the newer R-410A Puron.

Reference: http://www.ac-heatingconnect.com/whats-the-difference-between-r-22-and-r-410a/

What are all the parts (units, coils, etc) that need to be replaced?

share|improve this question
Pricing questions are off topic here since they vary significantly with time and location, making answers impossible. But the rest of this question looks good, so I edited the pricing part out. – BMitch Mar 31 '14 at 21:07
Thanks for clarification @BMitch – Danger14 Mar 31 '14 at 21:13

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