CFRG has some info on them. especially on variety and chill hours
http://crfgsandiego.org/Documents/LOW%20CHILL%20KIWI%20FRUIT.pdf
A. arguta is supposedly the "cold hardy" kiwi that is smaller and not fuzzy.
Actinidia chinensis is the "normal" fuzzy kiwi you see in stores. normally "Hayward" variety i think.
Actinidia kolomikta
is the hardiest species in the genus Actinidia, at least down to about −40 °C (−40 °F)
The plant is attractive to cats, which find it more attractive than catnip or valerian and can severely damage the vine.
https://en.wikipedia.org/wiki/Actinidia_kolomikta
i did some reading on this a while back
i cant find the links now
but, you would think that because A. Chinesis is not as cold hardy,
it would do better in warm, or "hot" environments
i had read something that said this wasnt true, and some species had a more narrow temp range
and some had a wider range.
- "Chinensis" was more in the narrow, and "kolomikta" was wider i think.
GRIN list
https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysimple.aspx?Actinidia
more here...
https://hort.purdue.edu/newcrop/proceedings1999/v4-342.html
http://sfp.ucdavis.edu/pubs/brochures/Kiwi/
The ones I've seen fruiting nicely here, are all A. chinensis cultivars. However I've seen at least 4 different, sizes and shapes, of fruit, wich means at least 4 cultivars do ok here. I'm not sure if they really need chilling hours or not; however I can say, here they don't get those chilling hours, as in allmost all the places I've seen them growing, they are at less than 700m from sea level, and it never gets colder than 10C (50F), and if it happens it never lasts more than a few hours; and as I said before, they fruit nicely.
The only option, is the temperature feeling! As 10C with 80% humidity, and 30Kmh wind, feels much colder than it actualy is; but it usualy is true for humans, not sure if works the same way with plants...
I've tried with other species, but until now, had no good results...
I'm growing, A. chinensis (2 cultivars), A. arguta (4 cultivars), A. kolomikta, and A. polygama, that is yet more atractive to cats, than A. kolomikta. Only the A. chinensis, and A. arguta Dr. Szymanowski, had flower for me, but the A. arguta never set fruit by absence of polinator, at the time, and I ended up loosing that plant.
Nélio.