Recent studies demonstrated that the physical feeling of warmth could make people judge others more favorably, act more generously (Williams & Bargh, 2008) and induce greater social proximity (IJzerman & Semin, 2009). In the present study, we examined whether temperature is implicitly associated with positive or negative valence. In Experiment 1, subjects judged the valence of the emotion words and pictures with two response buttons, of which one is physically warm and the other is physically cold, and measured the reaction time. The response button assignment can be either congruent (warm-positive / cold-negative) or incongruent (warm-negative / cold-positive). We found that for emotion words, the warm-positive / cold-negative congruence holds. However, for emotion pictures, reverse results were obtained. To further examine the thermo-valence association, follow-up implicit association tests (IATs) were conducted with positive/negative words and warm/cold words in Experiment 2, and positive/negative pictures with warm/cold pads in Experiment 3. The results from Experiment 2 show a tendency towards warm-positive / cold-negative congruence. However, such tendency was not found in Experiment 3. In summary, our results indicate that when the valence is presented semantically, it is implicitly associated with both physical thermal experience (EXP 1) and abstract thermal concept (EXP 2), and the association follows the common expectation of warm-positive / cold-negative congruence. However, when the valence is presented visually, the association is not consistent (EXP 1 & EXP 3). These findings suggest that temperature might interact differently with valences being elicited by semantic and visual information.