What does the temperature of a deal mean?

The temperature indicates the opinion of the community on a deal: each member can give a positive vote (“hot”) or negative (“cold”) to each of the proposed good plans. The votes add up to give a higher or lower temperature. A deal with a high temperature is therefore acclaimed by the community: good value for money, best price ever seen for a given service, interesting offer … This temperature is subjective and indicative: you can quite find an interesting deal for yourself if the community did not rate it well, and vice versa.