温热

On the temperature spectrum: 冷 (cold) — 凉 (cool) — 温 (warm) — 温热 (warm-hot, slightly stronger than 温) — 热 (hot) — 烫 (scalding). 温热 is the comfortable 'just-warmed-up' zone — bath water, baby formula, leftover soup.

memory

温 (warm) + 热 (hot) — picture warmth nudging into the hot zone. Also describes a comforting feeling: 温热的拥抱 (a warm embrace).