If you have an HVAC system in your home, you may have heard that one way to prevent it from developing rust and corrosion is to flush it with dry nitrogen gas. While this method can be effective, it's important to understand how it works and what its limitations are.
Dry nitrogen gas is less dense than air, so when it's introduced into the HVAC system, it displaces the air inside. This can help to remove moisture from the system, which can prevent rust and corrosion. However, nitrogen gas is also a very good conductor of heat. This means that if there's any moisture left in the system after flushing with nitrogen gas, it could actually accelerate the rusting process.
Another potential problem with using dry nitrogen gas to flush an HVAC system is that it can damage certain components if not done correctly. For example, if the nitrogen pressure is too high, it can cause seals and gaskets to fail. It's important to consult with a professional before attempting this method of flushing an HVAC system.