Hi saecho! My area is like yours, with intense hot sun, but my area gets shaded by city trees, so I put some of my Hoyas outdoors during summer in a part shade area. Before, I tried to put them in full sun, and they get badly bleached by the hot sun, so I keep them in part shade. I have also learned now to step up watering or spraying the vines, so it encourages more leaf growth. When I know our forecast is about to go into triple digits, I water the media and spray the vines early in the morning to help cool down the plants.
I used to have Hoya pubicalyx 'Silver Pink', don't know if that is the same as your Pink Silver. The one I used to have is rather sensitive to cold, so if it is the same plant, make sure you bring it indoors during winter. The only Hoya I have that have so far survived being outdoors year round is Hoya carnosa 'Krimson Queen' All my other hoyas stay indoors during winter.
