Heating · Montana
How Much Does It Cost to Run an Oil-Filled Radiator in Montana?
The short answer
In Montana, an oil-filled radiator drawing 1,500W costs about $0.16 per hour — roughly $38.30 a month if it runs 8 hours a day.
Montana’s average residential rate was 15.0¢ per kWh in July 2026 (EIA), 18% below the US average.
Source: U.S. EIA, July 2026 data · Updated
Oil-Filled Radiator cost by daily use in Montana
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 31.9 | $0.16 | $4.79 | $57.45 |
| 2 hours/day | 63.9 | $0.31 | $9.58 | $115 |
| 4 hours/day | 127.8 | $0.63 | $19.15 | $230 |
| 8 hours/day | 255.5 | $1.26 | $38.30 | $460 |
| 12 hours/day | 383.3 | $1.89 | $57.46 | $689 |
| 24 hours/day | 766.6 | $3.78 | $115 | $1,379 |
Montana vs other states
At typical use, an oil-filled radiator costs $460 a year in Montana — $1,012 less than in Hawaii and $69.60 more than in Louisiana.
Montana has the 14th-cheapest residential electricity of the 50 states and DC. Montana price per kWh · all states ranked
Electricity price trend in Montana
15.0¢/kWh in July 2026 — ▲ +5.0% from a year earlier.
How to lower the cost of running an oil-filled radiator
An oil-filled radiator heats sealed-in oil, which then releases heat slowly through the fins. It is not more efficient than a fan heater — electricity to heat is still about 1:1 — but the stored heat means the thermostat switches the element off for longer stretches once the room is warm. We assume the element is on about 70% of the time, so a 1,500W radiator averages roughly 1.05 kWh per hour of use. Expect the real number to be higher in a cold, drafty room and lower in a well-insulated one.
- Set the thermostat dial to the lowest comfortable setting and let the oil do the work.
- Place it near the coldest wall or under a window, away from furniture that blocks the fins.
- Switch to the lower power setting (600–900W) once the room is up to temperature.
- Winters in Montana are long, so heating appliances often run more hours here than the national default — adjust the hours above to match your home.
Questions
Frequently asked questions
How much does it cost to run an oil-filled radiator for 24 hours in Montana?
Running a 1,500W oil-filled radiator for 24 hours uses about 25.2 kWh, which costs about $3.78 at Montana’s average rate of 15.0¢/kWh.
How many kWh does an oil-filled radiator use per month?
At 8 hours a day, a typical oil-filled radiator uses about 256 kWh a month. In Montana that costs $38.30.
Is it expensive to run an oil-filled radiator in Montana?
Montana has the 14th-cheapest residential electricity of the 50 states and DC at 15.0¢/kWh — cheaper than most. Running an oil-filled radiator here costs about $460 a year at typical use, compared with $561 at the national average rate.
What is the electricity rate in Montana right now?
The average residential electricity rate in Montana was 15.0¢ per kWh in July 2026, according to the latest EIA data — up 5.0% from a year earlier.
Are oil-filled heaters cheaper to run than fan heaters?
Per watt, no — both convert electricity to heat at about 100%. In practice an oil-filled radiator often uses a little less because its thermostat cycles off for longer once the oil is hot.
Oil-Filled Radiator costs in nearby states
Other appliances in Montana
Cheapest and priciest states
Comparisons
Sources & method
- Electricity rates: U.S. Energy Information Administration, Electric Power Monthly — average residential retail price, July 2026 (latest available). Retrieved .
- CO₂: EIA State Electricity Profiles, 2024 emissions rate of in-state power generation.
- Default usage for oil-filled radiator: 8 hours a day, 70% duty cycle. Typical power 1,500W.
- Formulas, duty cycles and limitations: methodology. Data download: open data (CC BY 4.0).