Gas Leak & Carbon Monoxide Safety Inspection in Carlisle, PA

What a proper safety inspection includes

• Ambient CO measurement throughout the living space with a calibrated instrument
• Combustion analysis at each fuel-burning appliance — CO in the flue, O2, stack temperature, and efficiency
• Draft testing and spillage testing at the draft hood or vent connector
• Worst-case depressurization testing: exhaust fans, dryer, and fireplace running together to see whether appliances backdraft
• Heat exchanger inspection, visually and by combustion signature
• Gas line leak detection at every accessible joint with an electronic detector and bubble solution
• Vent and flue inspection for corrosion, disconnection, blockage, and correct sizing
• Combustion air verification — a very common problem in tightened-up older homes
• CO alarm placement, age, and function review

The orphaned water heater problem

This is the risk almost nobody warns homeowners about. In older Carlisle houses, the furnace and gas water heater often share a masonry chimney. When the furnace is upgraded to a 95% condensing model, it moves to PVC sidewall venting — and the water heater is left alone in a chimney sized for two appliances.

A small water heater cannot generate enough heat to establish draft in that oversized flue. Exhaust cools, condenses, and can spill back into the basement instead of going up. That is a carbon monoxide pathway created by an energy-efficiency upgrade.

We check for this on every furnace replacement quote and price the chimney liner or water-heater change when it applies. If someone replaced your furnace and never mentioned the water heater, get it tested.

CO alarms: placement, age, and the thing people miss

• One on every level of the home and outside each sleeping area, at minimum
• Alarms expire. Most sensors are rated for 7–10 years from the manufacture date — check the date on the back, not on the box
• Test monthly and replace batteries on schedule, or use sealed 10-year units
• Do not mount within about 15 feet of a fuel-burning appliance, or the nuisance alarms will make you disable it
• A UL-listed alarm sounds at CO levels well below immediate danger — but low-level chronic exposure can still make people sick below the alarm threshold, which is why annual combustion testing matters
• If you have an attached garage, put an alarm near the door into the house

Gas leak detection

If you smell gas, leave the building, do not touch light switches or your phone until you are outside, and call the gas utility from a safe distance. That call is free and they respond urgently. Then call us.

We locate leaks at appliance connections, unions, valves, drip legs, and the sections of piping we can access, and we make the repair on the appliance side. Meter-side and service-line issues belong to the utility.

A common finding we see in older borough basements is a decommissioned gas line — an old range or space heater connection that was capped decades ago and now weeps at the valve. Those get found on a proper inspection and nowhere else.

Why carbon monoxide exposure gets missed for weeks

Low-level carbon monoxide exposure does not feel like poisoning. It feels like a headache that clears when you go out, tiredness that does not match how you slept, nausea, or a household that all seems to have a lingering cold through the winter. Those symptoms are easy to attribute to anything else, which is precisely why the exposure continues.

Two patterns are worth knowing. If symptoms improve when you leave the house and return after a few hours at home, that is a signal worth taking seriously. If more than one person in the building, including pets, is unwell at the same time in the heating season, that is another.

None of this replaces an alarm, and an alarm sounding is not something to investigate at leisure. If an alarm activates, get everyone outside into fresh air and call 911 from outside. If anyone is confused, drowsy or unconscious, that is an emergency ahead of any consideration of the heating system. Our inspection comes after the building is safe, not instead of making it safe.

Combustion air: why sealing up a house can create the hazard

An atmospheric appliance, an older furnace, a standard water heater, a cast-iron boiler with a draft hood, needs air from the room to burn and needs the flue to draw properly to carry the products away. Both of those depend on air being available to replace what goes up the chimney.

Improve a house without accounting for that and the balance can change. New windows, air sealing, an added bathroom or kitchen exhaust fan, or a new dryer can each increase the depressurisation of a basement to the point where the flue no longer drafts reliably and combustion products spill into the room instead.

This is the specific reason we run worst-case depressurisation testing rather than simply checking whether an appliance lights. Turning on every exhaust device and closing the house down reproduces the condition that actually occurs on a winter evening, and it reveals spillage that a still afternoon test would never show.