The 670 W value is from the Frigidaire product support page (opens in a new tab), checked September 26, 2026. This discontinued model supplies a documented example, not a purchase recommendation. The eight-hour schedule is a chosen scenario. Confirm the wattage and voltage for your model before using it.
The $0.1834/kWh comparison uses the June 2026 US residential average in EIA table 5.6.A (opens in a new tab). Enter the variable price from your own summer bill when assessing this unit.
Calculate from the rated input
Monthly kWh = cooling watts ÷ 1,000 × scheduled hours per day × active days per month × duty cycle ÷ 100.
At 100% duty, 670 ÷ 1,000 × 8 × 30 = 160.8 kWh. At $0.1834/kWh, 160.8 × 0.1834 = $29.49072, displayed as $29.49.
The duty input represents the share of scheduled time at the stated cooling input. A thermostat may stop the compressor while controls or a fan remain active. Enter 100% when you use a measured average watt value over the complete observation period. Do not apply a guessed duty percentage to a kWh reading that already includes cycling.
Compare a schedule and a rate
The table holds the model's 670 W, 30 days and the EIA benchmark. Hours are chosen scenarios.
| Hours/day | Monthly kWh at 100% duty | Cost at $0.1834/kWh |
|---|---|---|
| 2 | 40.2 | $7.37 |
| 4 | 80.4 | $14.75 |
| 8 | 160.8 | $29.49 |
| 12 | 241.2 | $44.24 |
At a chosen $0.25/kWh price, the eight-hour scenario is $40.20. The 160.8 kWh does not change. This is why the rate on your bill matters more than a national benchmark when you are checking a particular month.
BTU is capacity, watts is input
BTU per hour describes cooling capacity. Watts describe electrical input. They are related through efficiency, so do not convert a BTU label to watts by using a single universal multiplier. Use the electrical input or measured kWh shown by the manufacturer and your meter.
The product page's 670 W is a model-specific cooling value. It is not a wattage for every 8,000 BTU unit. Features, voltage, controls and test conditions can differ. If the label shows amps and volts but no watts, a qualified person can help interpret it safely. Do not open the unit.
Check installation and operation safely
Follow the manufacturer's installation instructions and keep the unit supported as specified. This guide does not provide mounting or electrical instructions. A circuit, outlet or cord that feels hot needs attention from a licensed electrician.
Clean and airflow conditions can change runtime. Record filter cleaning, outdoor temperature and the thermostat setting in your notes. These observations help explain a meter result without assigning an invented percentage to weather or insulation.
Compare rated input with a measured average
Keep the planned schedule the same when comparing two kinds of evidence. In a hypothetical meter log, 5.4 kWh recorded over 12 hours gives an average of 0.45 kW, or 450 W. That average already includes any cycling during the observation. It is a teaching example, not a measurement we took from the Frigidaire model.
| Evidence used | Input in calculator | At 8 hours/day for 30 days | At $0.1834/kWh |
|---|---|---|---|
| Model's cooling input | 670 W, 100% duty assumption | 160.8 kWh | $29.49 |
| Hypothetical 5.4 kWh / 12-hour log | 450 W average, 100% duty | 108 kWh | $19.81 |
The second row uses 5.4 ÷ 12 × 8 × 30 = 108 kWh. Applying another duty-cycle reduction would count cycling twice. The difference between rows is not a savings claim: one is a rated-input scenario, while the other extrapolates a hypothetical observation. A hotter period, another thermostat setting or a different fan mode can change the next reading.
For your own log, record the model, start and end times, total kWh, thermostat setting, fan mode, outdoor conditions and filter condition. Compare periods of equal length where possible. Use a monitor only when its rating and the appliance instructions permit it; ask a licensed electrician if unsure. Do not open the unit or alter its electrical connection.
Use the estimate within its limits
The estimate excludes fixed utility charges, taxes, demand charges, and equipment purchase or maintenance. A single rate does not model time-of-use pricing. It does not compare a window unit with central air. Use the electricity-rate guide for tariff details, the appliance measurement guide for meter readings and the EnergyGuide guide for label context.
Enter the model's watts and your schedule in the appliance running-cost calculator. Its output is a planning estimate for the stated input, not a guarantee of your next bill.