In most locales, it’s not illegal to install your own heating system, but it is ill-advised if doing so is not your line of work. You do have to pull a permit, however. Certain types of units also require a license before they’ll be approved. But—just like with Goshen furnace repair—we do NOT recommend trying to replace your own furnace. Seemingly small mistakes can cause dangerous problems like carbon monoxide poisoning, raging house fires, and even widespread electrical issues. Moreover, no manufacturer will cover a unit installed by an unlicensed homeowner.