What is a common indicator of a gas leak in a home?

The presence of a rotten egg odor is a common indicator of a gas leak in a home because natural gas, which is typically odorless, is intentionally infused with a sulfur-containing compound called mercaptan. This compound gives gas its distinctive smell, comparable to that of rotten eggs, which serves as a safety measure to help people quickly detect leaks. Recognizing this odor is crucial for safety, as it prompts immediate action to address the potential danger.

In contrast, increased energy bills may indicate usage trends or inefficiencies rather than a specific leak. Unusual sounds from appliances could suggest operational issues, but they are not definitive signs of gas leaks. Discoloration of walls might occur due to various factors, including moisture or mold, but it does not specifically indicate a gas leak. Thus, the odor associated with a gas leak is the most reliable and immediate indicator that warrants attention.