I'm not sure that both types of optimisation need different icons. It's obvious which it is based on whether the next temperature change is an increase or a decrease.
But if it does need different symbols, I'd suggest a simple clock face icon with either a + or a - in the middle.
Something along the lines of Icon-Join-Optimise-Blue-on-White-220px.png, but more icon style.
Good UX obeys the "does what it says on the tin" principle.
P.
But if it does need different symbols, I'd suggest a simple clock face icon with either a + or a - in the middle.
Something along the lines of Icon-Join-Optimise-Blue-on-White-220px.png, but more icon style.
Good UX obeys the "does what it says on the tin" principle.
P.
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