warm
煦 centers on gentle, comforting warmth, like the sun's heat that soothes and nurtures.
煦 combines 昫 (warmth of the sun) with 灬 (fire), reinforcing the idea of gentle heat. The exact historical development is uncertain, but the components consistently point to warmth.
The top part 昫 suggests the sun's warmth, and the bottom 灬 is fire. Together they create a cozy, warming glow.
For ク, imagine a cool breeze turning warm as the sun rises: cool -> ク, but the 煦 warmth makes it comfortable.