I have a project where I use a 12V supply that feeds two LM7805CT Linear Voltage Regulators in parallel in order to feed with 5V and 2A to the PCB. The problem I have is that the device is inside a housing and the temperature rises too much. I have seen these devices are not very efficient and dissipate a lot of heat. I would like to know what other options do I have available in order to design a power supply that doesn't generate any heat inside the housing. I would like for the new design to be able to supply 4 A, what would you recommend?