Based on the shell and pair effects and the decay energy, we investigate the comparative half-lives of − -decay for some iron group nuclei and mainly discuss the electron energy, beta decay threshold energy, and the antineutrino energy losses by − -decay of several typical iron isotopes in the presence of strong electron screening (SES) and in the framework of linear response theory. Our main findings include the following: (a) antineutrino energy losses increase greatly by the SES, and the screening enhancement factor can reach 1,018 due to the Q-value correction and shell and pairing effects in the case of SES; (b) the antineutrino energy loss rates can be suppressed at a relatively lower density and in a higher temperature environment (e.g., 0.1 < 7 < 900, T 9 > 30); and (c) the screening enhancement factor can be decreased by about 16.62% (e.g., for 56 Co).