Natural gas and propane are odorless from the ground; the rotten-egg smell is mercaptan, an additive whose only job is to be unmissable. Respect it accordingly. A faint whiff near an appliance that comes and goes deserves a prompt professional visit with windows opened meanwhile. A strong or spreading odor deserves the full protocol: everyone out, no switches, no flames, no phones until outside, then the calls. There is no version of gas-leak troubleshooting worth doing yourself from inside the house — the professionals' entire advantage is instruments that find what noses only suspect.

Those instruments are the detection half of our work: electronic combustible-gas detectors sensitive to traces far below what you can smell, swept along every joint, fitting, valve, and appliance connection; pressure testing that proves whether the system holds; and bubble-solution verification at suspect fittings. Leaks hide in predictable places — aging fittings, flexible appliance connectors past their era, valves loosened by decades of thermal cycling, and buried lines to outbuildings and propane tanks on rural properties. Finding all of them, not just the loudest one, is the standard, because a system that had one neglected fitting frequently has two.