Seems to depend on when you bought your S5 - I got 2 coupons for buying out of the first "batch 7" (used) group.
Not sure if I'm going to use both, but definitely plan to use one of them when I get the coin together.
The S5 might have "officially" limited at 35C, but it could run hotter - just had to downclock it some.
Mine have seen brief periods pushing 40c ambient.
I'm sure the S7 will run at >40, just that's the max temp the "specified" rate is more-or-less guarenteed to be achieveable at.
Day-night rates never pay for mining, as a flat usage pattern will cost more on that sort of tariff.
It varies, the "Time of Day" rate here (which I presume is the sort of tariff you're talking about) DOES in fact save money for anything that's on 24/7. +40% for 65 hours vs -50% for 103 hours, which is actually inferior to the "ToD" rate modifications from the last 2 places I lived.
well lets see how bitmain will deal with this overpriced miner issue
Unfortunately, by recent Bitmain pricing standards, it's not overpriced. It's actually a hair LESS than I expected for the TH and power draw.