How gas appliances work: furnaces, water heaters, ranges and dryers, and how much of your Georgia gas bill each one drives.
Every therm on your bill was burned by an appliance. Knowing which ones, and roughly in what proportion, turns an abstract number into something you can act on — both when you compare Georgia natural gas rates and when you decide what to repair or replace.
Gas appliances all do the same thing: mix natural gas with air in a controlled ratio and ignite it, then transfer the heat to air, water or food. A gas valve meters the flow, an igniter starts combustion, a burner shapes the flame, and a heat exchanger or burner grate moves the energy where it is needed. Combustion by-products are vented outside through a flue.
Older appliances used a standing pilot — a small flame burning continuously, consuming gas around the clock. Modern units use electronic ignition, which lights only on demand. If you still have standing pilots, that is a real if modest year-round draw.
In a gas-heated Georgia home, space heating is typically the large majority of winter consumption and close to zero in summer. That is why bills swing so hard seasonally: it is volume, not a rate change, as explained in understand your natural gas bill.
Efficiency is rated as AFUE. An older 80% unit sends a fifth of the gas you pay for up the flue; a modern condensing furnace runs 90–98% by extracting heat from exhaust that older designs waste.
A tank water heater keeps 40–50 gallons hot continuously, losing heat through the tank wall and reheating to compensate. This standby loss is why your summer bill is not zero. Tankless units heat only on demand and eliminate standby loss, though they cost more to install.
Cooking and drying are a minor share of annual therms for most households. Replacing a gas range to save money rarely pays back; replacing a 20-year-old furnace often does.
Gas fireplaces vary enormously. A decorative unit left running on a mild evening can burn more gas than the furnace it is not replacing.
A healthy natural gas flame burns blue and steady. A yellow, orange or lazy flame suggests incomplete combustion — worth a service call, because incomplete combustion produces carbon monoxide. Other warning signs: soot near a burner or vent, a pilot that will not stay lit, loud booming on ignition, or condensation on windows when an appliance runs.
Carbon monoxide is colorless and odourless. Every home with gas appliances should have working CO alarms near sleeping areas. See natural gas safety for the full picture, and do you smell natural gas? if you suspect a leak right now.
More in natural gas energy savings tips and energy conservation tips.
Efficiency reduces therms; shopping reduces the price per therm. Both help, and they are independent. Once you know your usage, compare plans at your actual volume on the rate comparison page, or review marketers such as Gas South and Walton EMC Natural Gas. Weighing gas against electric appliances entirely? See gas vs electric.