How a Fireplace Heat Shield Provides Benefits to Your Home it will save energy, prevent chimney rebuild, get inspection in illinois. Fireplace heat shields in Illinois can help the home stay warmer than without a fireplace heat shield. But why install a fireplace heat shield in the first place? Many fireplaces over time develop gaps, cracks and deteriorate over time. If you use the fireplace often and have decided that getting the chimney and fireplace cleaned and inspected is unnecessary, we can tell you that smoke buildup, leaks, weakening of the chimney and fireplace…and even fires can form.