A device and method for electrostatic powder coating include: obtaining continuously a working fluid constituted by air deprived of undesirable substances; supplying the working fluid, between 0.5 bar and 10 bar, in a container containing an amount of coating powder; extracting from the container; a first flow made up of working fluid and powder; atomizing the first flow with working fluid at a pressure of between 0.5 bar and 10 bar; supplying working fluid at a pressure of between 0.5 bar and 10 bar to create a second transport flow made up of working fluid and atomized powder; charging the second flow electrostatically under pressure; and sending the second electrostatically charged flow of working fluid and atomized powder onto a substrate, at a temperature of between −15° C. and +45° C., and a device and method for electrostatic painting including heating/cooling temperature adjustment of the painting mixture.