Indoor environments, even on a very hot Summer day, are not hot enough to melt wax. Beeswax will alone will melt at around145°F. Encaustic medium is made with damar resin which raises the melting point further. By adding damar the melting point of an encaustic painting is 180-200°F.
Don’t leave an Encaustic painting in a car, heat of the sun is intensified through car windows. Still, it is advised not to hang the painting in direct sunlight or very close to a heat source. When hanging or storing any fine art, temperature control and sunlight exposure should be considered.
