A step up from the Home Office becomes available after Coal Burner is researched. It uses the same upgrades, so switching up to it becomes a no-brainer. The price may seem high in comparison to it`s selling power, but at this time of game, player most likely already invested in a few office upgrades.
Just like any other office, it has some nominal heat capacity, but it exists only to make sure it explodes at any heat contact then anything else.