Portland is one of the few markets in the West where the oil comparison in this guide's title is not a formality. The metro's older neighborhoods, Irvington, Ladd's Addition, Sellwood, the foursquare blocks of the inner east side, were built in oil's era, and a meaningful number of those basements still hold an oil furnace with a tank buried somewhere under the yard. Around them sits the rest of the region's heating inheritance: zonal electric and wall heaters in the bungalow stock, NW Natural furnaces across the postwar rings, propane past the mains, and, increasingly, heat pumps that came in with the last decade's remodels. This guide runs the conversion arithmetic against each, in a climate so friendly to the machine that the arithmetic mostly runs downhill.
The Ledger in One Table
| Existing heat | Case for a heat pump | Strength |
|---|---|---|
| Heating oil | Truck-priced fuel loses to metered kilowatt hours; tank risk retires | Strongest |
| Zonal electric / wall heaters | Same meter, a half to a third the consumption | Strongest |
| Propane (past the mains) | Same truck-versus-meter arithmetic | Strongest |
| Aging heat pump | Modern variable-speed machine beats it both seasons | Strong |
| Natural gas | Closest race; cooling and the stack settle it | Honest maybe |
Oil: The Fuel That Retires With Its Tank
The oil case has three layers, and only the first is the fuel bill. Oil arrives by truck at prices that swing season to season, while a heat pump moves two to three units of heat per unit of electricity purchased at rates that move slowly; across a Portland heating season the operating gap is wide and persistent. The second layer is the equipment: most surviving oil furnaces are decades old and running on borrowed time. The third is the tank, and it is the layer unique to this comparison: an aging buried tank is a liability sitting in the yard, and a conversion retires it, with decommissioning priced as a named line, per our installation cost guide. No other fuel on this page pays you three ways for leaving it.
Zonal Electric: The Multiplication That Never Misses
The metro's bungalows and mid-century stock lean heavily on zonal electric, wall heaters, ceiling heat, and baseboards, all converting one unit of electricity into one unit of warmth at full price. A heat pump on the same meter moves two to three units per unit purchased, so the heating share of the bill shrinks toward a half or a third with no fuel forecast in the calculation. Because these houses usually have no ducts, the conversion is a ductless project, which this metro executes as routinely as anywhere in the country, and the same heads deliver the first real cooling the house has ever had, per our cold-weather guide.
Propane and the Edges of the Map
Past the gas mains, toward Sandy and Estacada, out the valley toward Molalla, along the coast range edges and across the high desert around Bend and Prineville, households heat on propane delivered by truck. The arithmetic reads like oil without the buried tank: truck-priced fuel against metered kilowatt hours, and the meter wins by a wide margin. In the colder eastern stretches, Bend, Redmond, La Grande, Baker City, the specification tightens to machines with published cold-night capacity, because the high desert runs real winters the valley never sees, and the arithmetic still clears with room to spare.
The Honest Gas Paragraph
A household with a functioning NW Natural furnace faces the closest race in this guide, and deserves it stated plainly. Gas is cheap heat, the metro's winters are mild, and displacing a mid-life furnace rarely pays on fuel savings alone. What moves the 2026 verdict is the whole rest of the ledger: the Energy Trust layer trims the conversion, per our rebates guide; the summers have stopped being optional to cool, and the heat pump buys cooling and heating in one machine while the furnace buys only one of them; and at equipment failure, when the replacement dollar must be spent anyway, the marginal cost of choosing the heat pump is small. Dual fuel remains a legitimate configuration a good contractor prices without being asked. What no honest bidder does is promise a gas household dramatic heating savings; a bid that does has failed the first test in our contractor guide.
The Climate That Flatters the Machine
Every comparison above leans on the same background fact: this is close to ideal heat pump country. Design nights sit in the mid-twenties, where modern equipment retains most of its rated capacity without cold-climate premiums; the long shoulder seasons reward machines that modulate low and run steadily; and the dry summers give the same machine a second full-time job the housing stock never planned for. A heat pump here is not a compromise being defended; it is the tool the climate was waiting for, which is why the conversion math on this page runs downhill in a way colder markets have to work for.
Reading the First Year Correctly
Judge a conversion by shape, not by a single statement. The oil convert sees the delivery line vanish and a modest rise in winter electricity. The zonal-electric convert sees the same warmth cheaper immediately. The gas convert at failure time sees a similar winter and a far better summer. The discipline that makes all three legible is one ledger: last year's total heating and cooling spend, every fuel and every truck, next to this year's, read whole year against whole year. A single January bill misleads in a climate where the savings are spread thin and wide across ten mild months.
Renters, Landlords, and the Split Incentive
The metro's worst heating economics disproportionately serve tenants: zonal-electric units billed to renters through the wet season, window units dragged out for the hot weeks. The tenant pays the bill; the owner owns the fix; and the arithmetic reads identically for both, with only the beneficiary line changing. The owner's case needs no charity: the zonal conversion is among the strongest math on this page, the Energy Trust layer trims it, and a unit with real heat and real cooling rents better in every season. A tenant's cheapest move is forwarding this page to whoever holds the deed.
The Short Version
Oil loses three ways: on the fuel, on the dying furnace, and on the tank in the yard. Zonal electric loses on a single bill's multiplication. Propane loses on truck-versus-meter arithmetic, hardest in the cold east. Aging heat pumps lose both seasons to a modern machine. Functioning gas is the honest race, and the cooling line plus the Energy Trust stack settles it more often each year. The math carries every case from St. Johns to Sellwood to the far side of the mountains, and the machine that wins it was practically designed for this climate.
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