Zygo tribe; cool growing advice

[Dollythehun]

I'd like your opinion (which I may not follow).

My Zygo 'Advance Australia' is growing and blooming wonderfully in my cool/cold greenhouse window min 61f, max 72f). I also have a Tsb. 'Melinda Marie' and a Zygonesia 'Blue Birds' in that same window. The former is hanging on and has bloomed, the later is growing but, not bloomed.

Most of the area is taken up by phals. According to what I read lately, they should never survive in this cool window (in fact I felt so guilty, I bought them a tiny heater, which lowered their humidity). But, they've thrived for years in this window.

My question: should I let the health of the Zygo or the other two be my guide? (I understand the later two are hard to grow). I'd like to ditch my phals and grow more in the Zygo family. Thoughts or suggestions?