Gas Leaks Minimize the risk to you and your home by following these simple instructions. Ventilate your home by opening all doors and windows. Turn off the gas at the gas supply meter Call a professional. If you suspect that there is a gas leak, do not turn on any electrical switches, such as your lights, or ignite any flame, including a cigarette. Although the problem could simply be that a gas appliance was left on, it is better to be safe and take the necessary precautions.