I spent two and a half hours at the backyard today. I sat down right by the air conditioning unit and waited. At about 10am the Costa's came out and fed for a while. The purple on the side of the neck was glowing in the sun particularly brightly. I also saw two different Rufous Hummingbirds and a third hummingbird that I think was a female Ruby-throated? All green, no gorget, off white on throat, chest and belly. No facial pattern. It wasn't around long enough for me to see the white spot behind the eye or white on the tail feathers.
When other flocks came in, that's when hummers started showing up and would feed by the fence in particularly sunny moments. Also saw AMGO, CEDW, HOFI, CACH, TUTI, RBWO, PIWO, AMCR, NOMO, NOCA, CAWR, SSHA, RSHA, TUVU, YRWA, BLJA and I think that was it.