If your natural gas bill suddenly doubled, first determine whether your gas usage also doubled. If consumption jumped, colder weather, longer furnace runtime, thermostat changes, hot-water use or other gas appliances may be involved. If usage stayed similar, investigate the gas rate, delivery charges, fixed charges, adjustments and previous balances instead.
Treat that as a safety issue rather than a billing problem. CPSC advises leaving the home immediately and contacting local gas authorities from outside. Do not operate electronics, lights or phones before leaving.
First: Did Your Gas Usage Double Too?
This is the fastest way to narrow down the cause.
| Example | Previous Bill | Current Bill |
|---|---|---|
| Gas usage | 60 therms | 118 therms |
| Billing days | 30 | 31 |
| Bill | $78 | $158 |
| What stands out? | Both consumption and the dollar bill increased sharply. | |
In this fictional example, the first investigation should be the large consumption increase—not simply fees.
10 Things to Check When Your Gas Bill Doubles
Compare Gas Usage
Look for therms, CCF, Mcf or the other consumption unit used by your utility.
If the previous bill showed 60 therms and the new one shows 118 therms, consumption increased by about 97%.
That does not identify the cause, but it immediately tells you that increased usage is a major part of the bill change.
Check How Cold the Billing Period Was
Natural-gas consumption commonly rises during cold weather because of space-heating demand. EIA reports that U.S. natural-gas consumption typically peaks during the winter heating season, and increasing heating degree days are associated with higher space-heating demand. :contentReference[oaicite:1]{index=1}
Compare the current billing period with:
- The previous month
- The same month last year
- Periods with similar weather
A colder month can produce much more furnace runtime even if you did not intentionally change the thermostat.
Check Thermostat Settings and Schedules
A thermostat set to the same temperature does not guarantee identical consumption.
When outdoor temperatures fall, a heating system may need to operate much longer to maintain the same indoor temperature.
Also check whether:
- The temperature was raised.
- A nighttime setback was removed.
- The programmed schedule changed.
- The thermostat was placed on hold.
- Someone was home more often.
Look at Furnace or Boiler Runtime
If your home uses natural gas for space heating, unusually long heating cycles can increase gas consumption.
Consider:
- Colder outdoor temperatures
- Dirty filters where applicable
- Restricted airflow
- Drafty doors or windows
- Open windows
- Heating equipment needing professional attention
Check Gas Water Heating
If your water heater uses natural gas, increased hot-water demand can add to consumption.
Think about changes such as:
- More household members
- Longer or more frequent showers
- More laundry
- More dishwashing
- Changes to water-heater settings
During winter, colder incoming water can also mean the water heater has more work to do.
Check Other Gas Appliances
Your furnace may not be the only appliance using natural gas.
Depending on the home, gas may also serve:
- Water heaters
- Clothes dryers
- Ranges and ovens
- Fireplaces
- Pool or spa heaters
- Outdoor equipment
Look for new equipment or unusually heavy use during the billing period.
Check the Number of Billing Days
A longer bill can increase both consumption and cost.
For example:
- Previous bill: 27 days
- Current bill: 35 days
Compare average daily usage:
Gas usage ÷ billing days = average daily usage
This prevents a longer billing cycle from looking like an unexplained consumption surge.
Check Whether the Gas Rate Changed
EIA explains that household natural-gas spending depends on both consumption and the retail price. Cold weather can also increase overall gas demand and place upward pressure on prices. :contentReference[oaicite:2]{index=2}
Compare:
- Commodity or gas supply rate
- Delivery/distribution rate
- Customer charge
- Riders or adjustments
- Taxes and other applicable charges
Even a moderate rate increase becomes more noticeable when combined with sharply higher winter consumption.
Check Meter Reading and Account Adjustments
Look at whether your bill identifies the meter reading as actual, estimated, corrected or adjusted.
Also check for:
- Corrections from an earlier period
- One-time adjustments
- Credits that ended
- Additional charges
If the reading or adjustment is unclear, ask the utility to explain how the billed usage was calculated.
Check for a Previous Balance
A doubled amount due does not necessarily mean the current gas charges doubled.
| Fictional Account Item | Amount |
|---|---|
| Current gas/service charges | $90 |
| Previous balance | $85 |
| Total amount due | $175 |
In this example, current service did not suddenly cost $175.
Did My Gas Bill Really Double? Calculator
Enter your previous and current bill, usage and billing days. The calculator compares both the dollar change and average daily gas consumption.
Gas Bill Double-Check Calculator
Use the same gas-usage unit for both bills.
Can Cold Weather Really Double Gas Usage?
It can cause a large increase in homes using natural gas for space heating, although the size of the increase depends on the home, weather, heating system and household behavior.
EIA reports that natural-gas consumption typically peaks during the winter heating season because colder temperatures increase residential and commercial space-heating demand. :contentReference[oaicite:3]{index=3}
EIA also explains that unexpectedly cold or severe weather can increase natural-gas demand and put upward pressure on prices. :contentReference[oaicite:4]{index=4}
This creates a situation where a household could experience both higher consumption and a different retail price environment.
What If Usage Stayed Almost the Same?
If consumption is similar but the dollar amount nearly doubled, the problem is unlikely to be explained by consumption alone.
Compare:
- Commodity/supply rate
- Delivery/distribution charges
- Customer or fixed charges
- Riders and adjustments
- Taxes and other fees
- Expired credits
- Previous balances
See our detailed guide: Gas Bill High but Usage Is the Same? What to Check.
Could a Gas Leak Explain the Increase?
A utility bill alone cannot diagnose a gas leak.
If you smell gas or hear gas escaping, do not continue checking appliances or searching for a billing explanation. Current CPSC guidance says to leave immediately and contact local gas authorities from outside the home. :contentReference[oaicite:5]{index=5}
5-Minute Double-Bill Checklist
Check These in Order
- Compare total gas usage.
- Compare average daily usage.
- Compare billing days.
- Compare with the same month last year.
- Check weather differences.
- Review thermostat schedules.
- Consider furnace or boiler runtime.
- Check hot-water use.
- Check other gas appliances.
- Compare commodity/supply rates.
- Compare delivery and fixed charges.
- Check meter-reading status.
- Look for adjustments and credits.
- Check the previous balance.
What Should I Ask My Gas Utility?
- Why did my billed usage increase?
- Was the meter reading actual or estimated?
- How does my usage compare with the same period last year?
- Did my gas supply rate change?
- Did my delivery rate change?
- Did any fixed charges change?
- What does this adjustment or rider mean?
- Does the amount due include a previous balance?
Bottom Line
If your gas bill doubled, don’t assume there is one single cause.
Start with consumption. If average daily gas usage also rose dramatically, investigate weather and heating demand first. If usage stayed approximately the same, investigate rates and account charges instead.
The most useful comparison is not simply old bill versus new bill. Compare usage, billing days, rates and individual charges separately.
Authoritative Sources
U.S. Energy Information Administration:
Factors Affecting Natural Gas Prices
U.S. Energy Information Administration:
U.S. Natural Gas Consumption and Winter Heating Demand
U.S. Consumer Product Safety Commission:
Winter Gas and Carbon Monoxide Safety