The Triangle's heating ledger is unusual for this guide's genre: the heat pump is already the incumbent across much of the metro, which means the most common comparison here is not heat pump versus oil but new heat pump versus the builder-grade one limping through another January on its backup strips. The rest of the ledger still runs wide. Natural gas serves a large share of the core and the newer subdivisions. Electric strip heat and baseboard hide across the older stock of Oakwood, Mordecai, and the university rental blocks, the most expensive warmth on the grid. Propane trucks serve the county edges past the last mains, from Johnston County farm roads to the Chatham County countryside. Oil furnaces survive in scattered older farmhouses. This guide runs the conversion arithmetic for each case, with a cooling-dominated climate improving every answer, and with Duke's rebate tiers pointing at the two strongest cases by name.
The Ledger in One Table
| Existing heat | Case for a heat pump | Strength |
|---|---|---|
| Electric strip heat | Same meter, a half to a third the consumption, plus Duke's $1,000 tier | Strongest |
| Aging heat pump | Modern variable-speed machine retires the strip habit, plus Duke's $500 tier | Strong |
| Propane | Usually the region's most expensive delivered heat | Strongest |
| Heating oil | Truck-priced fuel loses to metered kilowatt hours moved at multiple efficiency | Strong |
| Natural gas | Closest race; the air conditioner's calendar usually settles it | Honest maybe |
Electric Resistance: The Case the Utility Pays Double to Close
Strip heat and baseboard convert one unit of electricity into one unit of warmth, full price, every hour. A heat pump on the same meter at the same rate moves two to three units of warmth per unit purchased: the same bill simply shrinks toward a half or a third for the heating share, with no fuel forecast or rate speculation in the calculation. Duke Energy Progress underlines the arithmetic with its own money: the Smart Saver strip-replacement tier pays $1,000, double the standard tier, because resistance heat is the grid's most expensive warmth, per our rebates guide. In the older rental and conversion stock where strips still hide, every line converges: the strongest operating case collects the largest rebate and adds real cooling to the same invoice.
The Aging Heat Pump, the Triangle's Most Common Project
North Carolina adopted heat pumps early and broadly, and the subdivisions from Cary to Apex to Wake Forest hold builder-grade machines that were honest in their day and are strip-heaters in this one. Below the temperatures where their compressors fade, they hand the load to electric resistance backup at full resistance rates, precisely when a cold snap makes the load largest. The bill signature is unmistakable: tolerable shoulder months, ugly statements after every January front, and summer bills a modern machine would beat anyway, which matters more here because the summer is the longer season. A variable-speed replacement, specified against published capacity tables per our cold-weather guide, holds output through the design nights around twenty degrees, retires the strip habit, out-cools the old machine through the long half of the year, and collects the $500 tier on the way in.
Delivered Fuel: The Truck Stops Coming
A household past the gas mains buys heat in large lumps, a tank fill at a time, at prices that swing with a market it cannot negotiate with. A heat pump replaces those gallons with kilowatt hours that move two to three units of heat per unit of electricity, billed monthly at rates that move slowly. The saving shows up in four figures for most conversions, and its shape is distinctive: the delivery line disappears entirely, the winter electric bill rises, and the year-total falls. The Triangle sweetens the deal from the other season, because the same machine replaces the aging air conditioner these households were going to buy anyway. These are the fastest-payback whole-home projects in the region, priced in our installation cost guide.
The Honest Gas Paragraph
A household with a functioning gas furnace faces the closest race in this guide, and deserves it stated coldly. Gas is cheap heat, and displacing a mid-life furnace rarely pays on fuel savings alone. The conversion cases that clear anyway are calendar cases, and in this climate the calendar's louder hand is the air conditioner: cooling equipment works a long, humid season, dies on schedule, and its replacement dollar buys a machine that heats too. Dual fuel, a heat pump carrying the season with the furnace held for the coldest snaps, is a legitimate configuration a good contractor prices without being asked. What no honest bidder does is promise a gas household dramatic savings; a bid that does has failed the first test in our contractor guide.
Reading the First Year Correctly
Judge the conversion by shape, not by a single statement. The delivered-fuel convert sees a larger winter electric bill and a smaller year, because the truck line vanished. The strip-heat convert sees the same warmth cheaper immediately, plus better cooling. The heat pump replacer sees the January snaps flatten and the summer improve. The discipline that makes all three legible is one ledger: last year's total heating and cooling spend, every source, next to this year's, read whole year against whole year each spring. A single January statement is the wrong number in a region that spends its real money on the cooling season.
Renters, Landlords, and the Split Incentive
The Triangle's most expensive heat disproportionately warms people who cannot replace the equipment: strip heat in older conversions around the universities, tired builder-grade heat pumps in rental blocks from Downtown Durham to the streets off Cameron Village. The tenant pays the bill; the owner owns the fix; and the arithmetic in this guide reads identically for both, with only the beneficiary line changing. The owner's case needs no charity: Duke's top tier on the strip swap, a large operating improvement, better cooling through a Carolina summer, and a property that rents better for both. A tenant's cheapest and most effective move is forwarding this page to whoever holds the deed, with one sentence attached: the heating system is costing us both money.
One Rule Before Any Conversion
Every case above assumes the machine was specified for the Triangle's actual coldest nights: published capacity at the design condition beside a room-by-room load calculation, backup sized as a safety net rather than a crutch, and the summer's humidity load counted with the seriousness this climate has earned. The arithmetic in this guide is fuel arithmetic; the specification discipline is what keeps it true through the first January snap and the first August week alike.
The Short Version
Strip heat loses on a single bill's multiplication and collects Duke's $1,000 tier for surrendering. Aging heat pumps, the Triangle's most common project, lose on their strip habit and collect the $500 tier. Propane and oil lose on truck-versus-meter arithmetic. Functioning gas furnaces make it a fair fight that the air conditioner's calendar usually settles. The math carries every case from Oakwood to Apex, and the rebate arrives on the invoice.
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