You can only "warm" anything from a lower temperature to a higher temperature.
To warm something from 42oC the temperaure will become higher than 42oC.
To get to 15oC you will have to COOL it i.e. extract heat to get to a lower temperature.
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Yes, it is.
15 degrees C
difference between -9 degrees and 13 degrees
59 F = 1.8*C + 32 Where C=15, F = 1.8*15 + 32 = 27 + 32 = 59.
15 - 32 = -17-17/9 = -1.9-1.9 X 5 = -9.515 f = -9.5 c