They have a top lid for accessing its contents and so, they lose less cold air when opened thus, providing effective cooling. If you have any information contact this numbers: 040 65556635, 040 69994603, 8374199399 etc……. All types of brands are available in this service center. http://homeappliancesservicecenter.bravesites.com/entries/general/lg-air-conditioner-service-center-in-hyderabad