Heating · Nationwide

Carbon monoxide and gas appliance safety

If a CO alarm sounds, get everyone outside and call 911 or the fire department. Afterward, a licensed HVAC tech should test the furnace's combustion, inspect the heat exchanger and flue, and confirm the appliance is safe before it runs again.

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Written price before any repair

Indoor air quality monitor showing CO2 and particle readings

Carbon monoxide comes from incomplete combustion in gas furnaces, water heaters, boilers and fireplaces. Blocked flues, disconnected vent pipes, cracked heat exchangers and backdrafting are the usual causes.

Many states require CO alarms in homes with fuel-burning appliances or attached garages. Place one near each sleeping area and replace alarms at the end of their rated life.

Carbon Monoxide & Gas Safety at a glance

Category: Heating
Service area: Nationwide
Typical visit: Ventilate and verify → Combustion analysis → Inspect → Make safe
Urgent help: Yes. Call for the fastest connection.

Symptoms

Signs you need carbon monoxide & gas safety

CO alarm sounding
Headaches or nausea that ease outside the house
Soot around the furnace or water heater
Yellow, flickering burner flame
Condensation on windows near gas appliances

Process

How the Carbon Monoxide & Gas Safety visit works

1
Ventilate and verify
Ambient CO readings throughout the home.
2
Combustion analysis
Flue gas CO, oxygen and draft measured at the appliance.
3
Inspect
Heat exchanger, flue connections, vent termination and combustion air.
4
Make safe
Repair, or shut off and tag the appliance until it is fixed.

Cost

What affects Carbon Monoxide & Gas Safety cost

Every contractor sets their own prices. These are the things that move the number. Ask for a written price before work starts.

Number of gas appliances tested
Camera inspection of the heat exchanger
Vent repairs needed

Before the tech arrives

What you can safely do before Carbon Monoxide & Gas Safety

Safe to try

Test CO alarms monthly
Keep vents and flues clear of storage

Stop and call

Never stay inside with an active CO alarm
Don't relight an appliance that was red-tagged

FAQ

Carbon Monoxide & Gas Safety questions

Who do I call first if my CO alarm goes off?+

Leave the home and call 911. The fire department can measure CO levels. Then have an HVAC contractor diagnose the source before using gas appliances again.

Carbon Monoxide & Gas Safety city guides

Carbon Monoxide & Gas Safety by state

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington Washington, D.C.West Virginia Wisconsin Wyoming

Furnace RepairNo heat, ignition failure, short cycling and pilot or flame sensor problems.

Technician reading refrigerant gauges during AC maintenance

Furnace & Heat Pump Tune-UpFall safety and performance check before cold nights.

Hydronic heating pipes with a circulator pump and pressure gauge

Boiler & Radiant HeatHydronic boilers, radiant floors and baseboard in older and custom homes.

Multimeter and test leads used for HVAC diagnostics

HVAC Inspection for Home BuyersPre-purchase system evaluation with age, condition and readings.

Carbon Monoxide & Gas Safety guides

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