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If you can smell gas in your home right now, stop reading and do this. Get everyone out of the house, including pets. Do not flip any light switch, do not touch a thermostat, do not use the fireplace switch or a remote, and do not open the garage door with the opener. Leave the door you exit through open behind you. Once you are outside and well away from the building, call your gas utility’s emergency line, or call 911.
Do not go back in to look for the source. Finding a leak is the utility’s job, they will come out for it, and they do not charge you for showing up to a gas odor call. Nothing in your fireplace is worth staying inside for.
That is the whole answer for a strong smell. The rest of this is for the milder situations people also call me about, because not every gas odor is a leak, and it helps to know the difference.
Why a real leak smells the way it does
Natural gas has no smell of its own. An odorant is added to it deliberately so that people notice it, and it is designed to smell unpleasant and unmistakable — rotten eggs, sulfur, a struck match. It is not subtle. It is not something you talk yourself into.
That is the practical test. If you are standing there asking yourself whether that might be gas, and it is faint, and it fades as the fire runs, you are probably smelling one of the ordinary things below. If it hits you as you walk into the room or gets stronger near the fireplace, treat it as a leak and go outside. Being wrong in that direction costs you an inconvenient afternoon. Being wrong the other way costs a great deal more.
The first fires of the season
This is the call I get every October, and it is usually nothing.
A fireplace sits idle from March to autumn. Dust settles on the logs, the burner and the metal inside the firebox, and the first time you run it, all of that burns off at once. It smells like scorched dust — the same smell your furnace makes on its first run of the year, because it is the same thing happening.
What tells you it is dust: it appears while the fire burns, not when it is off. It is strongest early and fades, weaker on the second and third fire, gone by the fourth. Crack a window during those first burns and let the room clear.
What does not fit that pattern: a smell that is present with the fireplace cold and unused. That is not dust, and that is worth a call.
Vented gas log sets and their own odor
A vented log set produces some smell simply because of how the flame is designed to burn. The tall yellow flame that makes it look like wood is a slightly less complete burn than a blue flame, on purpose, for appearance. Some of that odor reaches the room, particularly if the damper is not fully open or the flue has not established draft yet.
Two things are worth knowing. The damper on a vented log set must be open whenever it burns, and many are clamped so they cannot be shut. And a flue that has been cold for months needs a minute to start drawing — until it does, some of what should go up comes into the room instead.
If the smell is persistent, if the room gives people a headache while the fire runs, or if soot marks appear above the opening, something is wrong with how it vents and I would want to look at it. That is part of what I check on a gas fireplace service visit.
Carbon monoxide is a separate problem
Worth saying clearly, because the two get confused. Carbon monoxide has no smell at all. You cannot detect it by sniffing, and a gas odor is not a carbon monoxide warning.
Every home with a gas appliance should have working carbon monoxide alarms. If one sounds, the response is the same as a gas smell: everyone outside, then call from outside. Do not wait to see whether it stops.
What I do when you call me about a smell
First I make sure it is not an active leak, because that belongs to the gas utility and not to me. Once that is settled I go through the burner and pilot assembly, look at how the flame is burning, and check the venting, the damper, and whether the room is fighting the flue.
I photograph what I find and show you on the spot, and if anything needs doing you get a written estimate before I start. I am not going to talk you into work by describing a hazard you cannot see. If it turns out to be summer dust and a half-shut damper, I will tell you that.
To repeat the one thing that matters: a strong gas smell means leave the house and call the utility from outside. Everything else can wait. Once it is safe, if you want someone to go through the fireplace properly, call or text me at 214-300-5295.