I've read a few posts on the issue of TXVs. I am building a new home in Bakersfield, CA. The climate is hot in summer (often >100), relatively low humidity. Winters rarely are below freezing.
One contractor has offered me the option of having TXVs for an additional $350 per unit. He isn't making a hard sell, he's just offering the option and tells me that opinions vary as to the usefulness of TXVs.
There seems to be a fair amount if disagreement between the professional members of this site as to the value of TXVs.
I would welcome any opinions or hard facts that the professional members have on this issue.