Georgia Winter Utility Forensics Case Year 2026–27 Metro Atlanta Home File

Heating Bill Investigation • Gas, Heat Pump, and House Performance

Cost of Winter Heating in Georgia: Gas vs. Heat Pump Guide

A mild Georgia winter can still produce an expensive month when auxiliary heat activates, a gas base charge meets a cold snap, ducts leak into an attic, or a large suburban home cannot hold the heat its equipment produces.

EVIDENCE 01 The utility bill Rate plan, fixed charges, kWh, therms, delivery fees, fuel costs, taxes, and billing period.

EVIDENCE 02 The heating equipment Furnace AFUE, heat-pump HSPF2, backup heat, sizing, service history, and thermostat controls.

EVIDENCE 03 The building envelope Attic, ducts, walls, windows, crawlspace, basement, air leakage, and room imbalance.

The cost of winter heating in Georgia cannot be estimated reliably from the words “gas heat” or “electric heat pump” alone. Two homes using the same fuel can produce very different bills because of equipment age, utility territory, rate plan, square footage, thermostat use, duct condition, insulation, appliance mix, and weather. Last reviewed: July 10, 2026.

This guide is written for buyers, renters, and homeowners comparing Atlanta-area suburbs such as Alpharetta, Milton, Johns Creek, Roswell, Sandy Springs, East Cobb, Marietta, Suwanee, Duluth, Peachtree Corners, Cumming, South Forsyth, and Peachtree City. It does not predict a specific monthly bill. It shows how to investigate the bill before a purchase and how to compare natural gas, electric heat pumps, and dual-fuel systems using actual household evidence.

Most important rule: request full utility statements rather than screenshots of the payment amount. Budget billing, FlatBill-style arrangements, credits, deposits, prior balances, and partial billing periods can hide the home’s actual monthly energy use.

CASE 01 • BILL ANATOMY

Cost of Winter Heating in Georgia Starts With the Full Bill Stack

A posted utility rate is not the same as the amount paid per unit after all charges are included. The electric bill may contain an energy component, fuel-related adjustments, taxes, fees, account charges, and terms specific to the selected rate plan. A gas bill in much of metro Atlanta may combine a marketer’s commodity plan and service fee with Atlanta Gas Light delivery- related charges.

WINTER UTILITY STATEMENT DO NOT ANALYZE PAYMENT AMOUNT ALONE

BILLING PERIOD

Count the actual service days. A 35-day cold billing cycle should not be compared directly with a 27-day mild-weather cycle.

ENERGY USE

Record electricity in kWh and natural gas in therms. These values describe consumption more clearly than the total payment.

VARIABLE CHARGES

Identify charges that rise with kWh or therm use, including the applicable energy or commodity price.

FIXED / SEASONAL CHARGES

Identify customer, service, meter, marketer, capacity, and delivery-related charges that may remain even when usage is low.

NON-ENERGY ITEMS

Separate deposits, late charges, prior balances, payment-plan adjustments, protection products, and one-time fees.

Effective household energy cost = current-period energy and utility charges ÷ current-period kWh or therms.

As reviewed in July 2026, Georgia Power’s standard Residential Service page displays an October-through-May energy price of $0.082 per kWh. That is not a universal final price for every Georgia household. Additional charges and fees may apply, customers can select other rate plans, and many Georgia residents receive electricity from an EMC, municipal utility, or another provider.

Georgia Power reported that its residential customers paid an average price of 16.29 cents per kWh during 2025. The difference between that all-customer average and a posted energy component illustrates why buyers should not multiply one headline rate by usage and treat the result as a complete bill.

Natural-gas warning: Atlanta Gas Light explains that its residential DDDC-related seasonal rate structure produces higher base charges in winter and lower base charges in summer. The gas commodity price and marketer terms are separate variables. Compare the current Georgia PSC marketer chart and the full AGL pass-through portion shown on the actual bill.

CASE 02 • EQUIPMENT BENCH

Natural Gas vs. Electric Heat Pumps Is Not a One-Variable Contest

Natural-gas furnaces generate heat by combustion. Heat pumps move heat from outside to inside using refrigeration equipment. Dual-fuel systems combine a heat pump with a gas furnace and switch between them according to equipment, thermostat, outdoor temperature, or economic settings.

GAS

Natural-Gas Furnace

Strong supply-air warmth with a separate gas commodity and delivery structure

Efficiency evidence Furnace AFUE rating, model number, installation date, combustion test, service history, and venting condition.

Bill evidence Therm use, marketer price, plan term, monthly service fee, AGL charges, DDDC factor, taxes, and other gas appliances.

Best-case profile Reasonably efficient equipment, sound ducts, predictable marketer plan, and a household already using gas for several appliances.

Primary risk Buyers focus only on the advertised therm price and ignore delivery, seasonal base, appliance, or aging-equipment costs.

Electric Air-Source Heat Pump

One refrigeration system provides both heating and cooling

Efficiency evidence HSPF2, low-temperature performance, equipment pairing, Manual J sizing, airflow, refrigerant condition, and thermostat compatibility.

Bill evidence Winter kWh, rate plan, auxiliary or emergency heat runtime, outdoor temperature, thermostat changes, and service history.

Best-case profile Modern equipment in a sealed and insulated house with balanced ducts, moderate thermostat changes, and limited resistance-heat use.

Primary risk Electric resistance strips operate frequently because of equipment, airflow, control, sizing, maintenance, or rapid temperature recovery.

Dual-Fuel Heat Pump and Gas Furnace

Heat pump operation in milder weather with gas available for colder conditions

Efficiency evidence Heat-pump specifications, furnace AFUE, thermostat model, outdoor sensor, balance point, and contractor commissioning records.

Bill evidence Both electric and gas statements must be reviewed together. One bill alone can make the system look artificially inexpensive.

Best-case profile Correctly sized and commissioned equipment with a switchover strategy matched to comfort, energy rates, and actual system performance.

Primary risk An inappropriate lockout or balance-point setting causes unnecessary gas use, excessive electric use, or comfort problems.

ENERGY STAR advises homeowners to have contractors determine appropriate equipment size through a Manual J heating-and-cooling load calculation. Replacing a failed unit solely with the same nominal capacity can reproduce an old sizing mistake rather than solve it.

CASE 03 • DELIVERED-HEAT MATH

Compare What It Costs to Deliver Heat Into the House

Electricity is billed in kilowatt-hours, natural gas is commonly billed in therms, and equipment efficiency determines how much useful heat reaches the home. Comparing cents per kWh with dollars per therm directly does not answer which system delivers lower-cost heat.

DELIVERED HEAT WORKSHEET • USE ACTUAL BILL AND EQUIPMENT DATA

Electric heat-pump variable cost

Cost per 1,000,000 Btu delivered ≈ effective electricity rate × 293.1 ÷ seasonal COP

One million Btu equals approximately 293.1 kWh of heat energy. A heat pump with a seasonal coefficient of performance above 1 delivers more heat than the electrical energy it consumes because it moves heat rather than producing all heat through electrical resistance.

Gas-furnace variable cost

Cost per 1,000,000 Btu delivered ≈ variable gas price per therm × 10 ÷ furnace AFUE

One therm equals 100,000 Btu. An AFUE of 0.90 means the comparison assumes approximately 90% of the fuel’s annualized energy becomes useful heat, subject to actual equipment and installation performance.

Add the charges the formula does not capture

Add monthly gas marketer fees, AGL seasonal and delivery-related charges, electric customer charges, taxes, and other fixed amounts separately. Also account for water heating, cooking, fireplaces, dryers, and other appliances sharing either bill.

This calculation is a screening tool rather than an HVAC design model. A contractor or energy auditor should evaluate actual equipment performance, balance point, load, ducts, controls, and combustion safety before a major replacement decision.

CASE 04 • THERMAL LOSS MAP

The House Can Overrule the Heating Equipment

A high-efficiency furnace or heat pump cannot compensate fully for a house that loses conditioned air through the attic, ducts, crawlspace, windows, doors, or building penetrations. Comfort complaints can also come from poor airflow, return-air restrictions, unbalanced rooms, or ducts located outside conditioned space.

HOUSE HEAT-LOSS FIELD MAP • INSPECT THE PATH, NOT ONLY THE UNIT

ZONE A • ATTIC

Check insulation depth and coverage, attic bypasses, pull-down stairs, recessed fixtures, plumbing penetrations, top plates, bath-fan discharge, and evidence of previous moisture.

ZONE B • DUCT SYSTEM

Identify whether ducts run through an attic, crawlspace, basement, garage, or conditioned area. Look for disconnected runs, crushed flex duct, damaged insulation, loose boots, poor return paths, and temperature imbalance.

ZONE C • WINDOWS AND DOORS

Check air leakage, failed seals, damaged weatherstripping, large glass areas, sunroom additions, exterior-door alignment, and rooms with persistent cold surfaces.

ZONE D • CRAWLSPACE / BASEMENT

Review foundation vents, rim joists, insulation condition, moisture, plumbing penetrations, air-handler location, return leakage, and whether the space is vented, sealed, or conditioned.

ZONE E • HOUSE GEOMETRY

Two-story foyers, vaulted ceilings, large open plans, bonus rooms over garages, extensive rooflines, additions, and high exterior-wall area can increase heating demand and room imbalance.

Georgia Power’s 2026 Home Energy Improvement Program includes eligible measures such as home energy assessments, attic insulation, air sealing, duct repair and sealing, HVAC maintenance, and certain heat-pump conversions. Program amounts, preconditions, installers, and eligibility can change and should be confirmed before work begins.

Buyers of older homes should combine this investigation with the Georgia home-inspection checklist and the slab, crawlspace, and basement comparison .

CASE 05 • COLD-SNAP EVENT LOG

How One Cold Week Becomes a High Utility Bill

A winter bill is usually the result of a sequence rather than one defect. Outdoor temperature falls, the house loses heat faster, the system runs longer, backup equipment may activate, and the billing cycle captures more heating hours than the household expected.

Event 01 — Outdoor temperature falls The difference between indoor and outdoor temperature grows, increasing the building’s heating load.

Event 02 — Runtime increases Furnaces burn more therms and heat pumps consume more kWh as they operate longer to maintain the thermostat setting.

Event 03 — Weak areas become visible Rooms over garages, bonus rooms, long duct runs, vaulted spaces, leaky returns, and poorly insulated areas may fall behind.

Event 04 — Supplemental heat may activate A heat pump may call for auxiliary heat because of outdoor conditions, capacity, rapid thermostat recovery, equipment settings, or a fault.

Event 05 — Household behavior changes Occupants raise the thermostat, use fireplaces or portable heaters, close doors or vents, and alter routines in ways that can change both comfort and energy use.

Event 06 — The longer billing cycle arrives The statement may include the cold spell, more service days, seasonal gas base charges, and higher overall household energy use.

Diagnose a high month by comparing daily weather, service days, therm or kWh use, thermostat history, auxiliary-heat indicators, and repair records. Do not assume that every increase is caused by a utility rate change.

CASE 06 • BUYER DOCUMENT FILE

Request 12 Months of Evidence Before Budgeting the House

Utility history is most useful when it covers summer and winter, identifies the actual usage units, and includes enough context to explain household behavior. A seller’s family size, thermostat preference, remote-work schedule, pool, gas logs, electric vehicle, and appliance mix may differ from yours.

WINTER UTILITY EVIDENCE REQUEST

Full electric statements covering the most recent 12 months

Full natural-gas statements for the same period, where applicable

Monthly kWh, therms, billing days, and total current-period charges

Rate-plan name, gas marketer, fixed or variable contract, and expiration date

Furnace, heat-pump, air-handler, and thermostat model numbers

Installation dates, service history, warranties, and recent repair invoices

Gas-appliance inventory, including water heater, cooktop, dryer, fireplaces, and pool equipment

Attic-insulation, air-sealing, duct, crawlspace, window, and addition records

Seller explanation of thermostat schedules, occupied hours, and unusual high-usage months

Confirmation that payment-plan credits or prior balances are excluded from the usage analysis

Some utilities may provide usage history to an authorized customer rather than a buyer. When complete seller statements are unavailable, request redacted copies showing the billing period, kWh or therms, current charges, and rate information.

Connect heating evidence with the broader Georgia hidden-utility-fee guide and Atlanta suburbs cost-of-living guide .

CASE 07 • IMPROVEMENT ORDER

Do Not Replace the HVAC Unit Before Diagnosing the House

Equipment replacement may be necessary, but the most expensive solution should not automatically be the first solution. A new system connected to leaking ducts, weak returns, insufficient insulation, or inappropriate controls can remain uncomfortable and expensive.

Confirm the billing evidence.
Separate usage, fixed charges, plan terms, billing days, and one-time adjustments before blaming equipment.

Complete maintenance and operating checks.
Inspect filters, thermostat operation, refrigerant or combustion condition, airflow, electrical components, condensate, blower, and system controls.

Test the ducts and building envelope.
Investigate attic, air leakage, returns, duct connections, insulation, crawlspace, basement, and room pressure before choosing equipment size.

Correct thermostat and backup-heat settings.
Verify that the thermostat matches the equipment and that auxiliary, emergency, or dual-fuel operation follows the intended control strategy.

Obtain a Manual J load calculation.
Account for current insulation, windows, orientation, additions, ducts, design temperatures, and planned envelope improvements.

Compare complete replacement proposals.
Review equipment match, efficiency, low-temperature capacity, backup heat, duct modifications, electrical or gas work, controls, commissioning, warranty, rebates, and total installed cost.

Verify current Georgia Power incentives before signing a contract. Rebates may require eligible equipment, participating installers, testing, preapproval, documentation, or application deadlines and are not guaranteed for every project.

CASE 08 • HOUSEHOLD FIT

Three Homes Can Produce Three Different Answers

Smaller or newer home with a modern heat pump

Lower load, tighter envelope, shorter ducts, and one heating-and-cooling system

Likely strength Efficient operation during much of Georgia’s heating season when the system is sized, maintained, and controlled correctly.

Primary investigation Auxiliary-heat runtime, thermostat recovery, HSPF2, duct balance, insulation, winter kWh, and low-temperature performance.

Do not assume A new house or new heat pump automatically has correct sizing, sealed ducts, balanced rooms, or low resistance-heat use.

Mid-size established home with a gas furnace

Familiar warm-air comfort with separate marketer and delivery-related charges

Likely strength Strong heating output during colder mornings when the furnace and duct system are in sound condition.

Primary investigation Furnace age and AFUE, marketer plan, AGL charges, DDDC, therm history, combustion safety, ducts, and other gas appliances.

Do not assume A low advertised therm rate represents the final bill or that strong vent temperature proves low operating cost.

Large suburban home with multiple systems or dual fuel

More zones, more equipment, more exterior area, and more opportunities for imbalance

Likely strength Zoned or dual-fuel operation can provide flexibility when systems are designed and commissioned as one coordinated house.

Primary investigation Separate-system age, zone controls, balance points, high ceilings, unused rooms, bonus spaces, attic ducts, gas and electric bills, and replacement timing.

Do not assume A premium home has premium ducts, insulation, controls, commissioning, or reserves for replacing several systems.

PRIORITY • LOW BILL

Choose documented performance: complete utility history, sound equipment, sealed ducts, adequate insulation, manageable square footage, and predictable charges.

PRIORITY • COMFORT

Look for even temperatures, quiet operation, appropriate humidity, good return paths, balanced airflow, gradual thermostat recovery, and reliable backup operation.

PRIORITY • OLDER HOME

Treat HVAC, attic, ducts, crawlspace, windows, electrical capacity, combustion safety, and near-term replacement reserves as one purchase file.

PRIORITY • FUTURE UPGRADE

Obtain load and envelope information before choosing gas replacement, heat-pump conversion, dual fuel, mini-splits, or a major duct redesign.

CASE 09 • QUICK ANSWERS

Georgia Winter Heating Cost FAQ

Is natural gas always cheaper than an electric heat pump in Georgia?

No. The result depends on the gas marketer plan, AGL charges, electric rate plan, furnace AFUE, heat-pump seasonal performance, auxiliary heat, equipment condition, house load, ducts, thermostat use, and fixed charges.

Why did my heat-pump electric bill rise after one cold week?

Longer compressor runtime, auxiliary resistance heat, a longer billing cycle, rapid thermostat recovery, weak airflow, maintenance issues, or a leaky house can all contribute. Compare kWh, daily weather, thermostat history, equipment indicators, and billing days.

Why does my natural-gas bill include charges when I use little gas?

Gas bills can include marketer fees and Atlanta Gas Light delivery or capacity-related charges in addition to commodity use. AGL’s residential seasonal structure can also produce higher base charges in winter.

Should I replace the HVAC system before improving insulation?

Diagnose both together. Envelope and duct improvements can reduce the required heating load and may affect the appropriate replacement size. Major work should follow an inspection, testing, and a professional load calculation.

What is the single best document to request before buying?

Request 12 consecutive months of complete electric and gas statements, including usage units, billing dates, current charges, rate-plan information, and enough context to separate heating from other household energy use.

Official Utility and Equipment Research Desk

Georgia Power Residential Service — Review current seasonal energy pricing, account terms, and notices that additional charges and fees may apply.
Georgia Power Residential Rate Plans — Compare the standard residential plan with time-based, FlatBill, and other available options.
Georgia Power Rate Changes — Check current fuel, storm, and base-rate developments before using an older utility-cost estimate.
Georgia Power Home Energy Improvement Program — Review current assessments, insulation, air sealing, duct, HVAC, heat-pump, and rebate eligibility information.
Atlanta Gas Light Rates and Tariff — Understand the DDDC concept, seasonal base-charge structure, and delivery-related gas charges.
Georgia PSC Gas Marketer Pricing Comparison — Compare current certified marketer plans using the PSC’s monthly charts.
Georgia PSC: Selecting a Natural Gas Marketer — Review plan structure, price, service, and contract questions.
ENERGY STAR Air-Source Heat Pumps — Review proper sizing, Manual J, dual-fuel systems, low-temperature performance, and contractor guidance.
ENERGY STAR Heat-Pump Product Criteria — Understand HSPF2 and other current efficiency measures.
U.S. EIA Energy Conversion Factors — Verify the standard Btu conversions used to compare electricity and natural gas.

FINAL FORENSIC FINDING

The Cheapest Fuel Cannot Rescue an Inefficient House

The cost of winter heating in Georgia is determined by a chain: the utility territory and rate plan price the energy; the furnace or heat pump converts or moves it; the ducts distribute it; the house retains or loses it; and the thermostat and occupants decide how the system operates.

Natural gas may be the better fit for one existing home. A modern heat pump may be the better fit for another. Dual fuel may work well where both systems are properly sized and controlled. None should be selected from reputation, vent temperature, or one utility advertisement alone.

Before buying or replacing equipment, collect the statements, record kWh and therms, identify fixed charges, inspect the envelope and ducts, document the equipment, and require a load-based proposal. That evidence is far more useful than assuming every Georgia winter is inexpensive.