What Does It Cost to Run a Window AC in Massachusetts?
Running a window ac in Massachusetts costs about $63.61 a month — $773.95 a year — at the state's average rate of 29.45 ¢/kWh. That's roughly $266.22 a year more than a household paying the national average pays for the exact same window ac. The estimate assumes a typical 900-watt window ac running 8 hours/day, at the all-in average rate (delivery, fixed charges, and utility fees already included; locally billed taxes vary by area).
Key metrics
| Metric | Value |
|---|---|
| Average wattage assumption | 900 W |
| Typical usage assumption | 8 hours/day |
| Estimated monthly electricity use | 216.0 kWh |
| Estimated monthly cost | $63.61 |
| Estimated yearly cost | $773.95 |
Window AC cost vs U.S. average
At the state average rate, a window ac in Massachusetts costs $21.88 more a month than it would at the U.S. average rate.
How much electricity does a window ac use?
A window ac draws roughly 500-1,500 W; we use 900 watts running 8 hours/day. That comes to 7.20 kWh a day — 216.0 kWh a month, or 2628.0 kWh over a year — using kWh = watts × hours ÷ 1000.
A window unit clicks on and off with the thermostat, so what it actually costs you rises and falls with the weather and where you set the dial. Nudging it up a couple degrees on a hot afternoon is the easiest way to spend less. Massachusetts prices that energy at 29.45 ¢/kWh, against a 19.32 ¢/kWh national average.
Window AC operating cost estimate in Massachusetts
| Time period | Energy use | Cost |
|---|---|---|
| Per hour | 0.90 kWh | $0.27 |
| Per day | 7.20 kWh | $2.12 |
| Per month | 216.0 kWh | $63.61 |
| Per year | 2628.0 kWh | $773.95 |
These figures use the all-in average rate. Your actual bill can run higher when separately billed taxes, seasonal pricing, and fixed monthly fees apply.
What changes the cost the most?
Two things move this number: your state's rate, which you can't change, and how hard the appliance works, which you often can. For a window ac, that mostly comes down to BTU size, climate, thermostat setting.
Using yours more lightly or heavily than our assumption? The state calculator and usage-cost pages below model your exact scenario at the same rate.
For calculator-style comparisons, use the Window AC calculator in Massachusetts to compare light, typical, and heavy usage profiles.
Comparison entry points
Browse related comparisons from the energy comparison hub:
City pages for selected metros in Massachusetts
These city pages add local rate context for the same appliance assumptions. City values are estimates.
| City | City rate | Monthly estimate | Yearly estimate | More detail |
|---|---|---|---|---|
| Boston | 30.04 ¢/kWh | $64.88 | $778.61 | City electricity context |
City electricity pages focus on local rate context. The table above uses the statewide average rate.
Related appliance cost pages for Massachusetts
- Space Heater cost in Massachusetts — Typical 750-1,500 W estimate with state-specific pricing
- Portable AC cost in Massachusetts — Typical 700-1,400 W estimate with state-specific pricing
- Central AC cost in Massachusetts — Typical 2,000-5,000 W estimate with state-specific pricing
- Air Purifier cost in Massachusetts — Typical 25-100 W estimate with state-specific pricing
Frequently asked questions
How much does it cost to run a window ac in Massachusetts?
At 8 hours/day and the state average rate of 29.45 ¢/kWh, you'd pay about $63.61 a month.
Does this estimate include delivery fees and taxes?
Yes — the all-in average rate already includes delivery, fixed charges, and utility fees; locally billed taxes vary by area.
Where else can I compare this appliance?
See the appliance comparison guide, or the Massachusetts bill estimator for whole-household profiles.
State cost and bill pathways for Massachusetts
- Average power price in Massachusetts — What a kWh of electricity costs in Massachusetts
- Massachusetts electricity rates — Core authority page with statewide pricing context
- Electricity cost in Massachusetts — State-level cost, affordability, and value overview
- Electricity cost in Boston, Massachusetts — City electricity page with methodology notes where city coverage is available
- Massachusetts monthly electricity bill estimate — What a typical monthly bill looks like
- Electric bill estimator scenarios in Massachusetts — Estimate your bill from your monthly usage
Historical and trend pages
- Historical electricity prices in Massachusetts — Historical context and trend interpretation
- Electricity inflation in Massachusetts — State electricity inflation analysis
- Massachusetts electricity price volatility — Volatility and rate movement profile
Fixed-usage and calculator pathways
- 300 kWh cost in Massachusetts — Cost for this usage amount in the same state
- 100 kWh cost in Massachusetts — Cost for this usage amount in the same state
- 500 kWh cost in Massachusetts — Cost for this usage amount in the same state
- Custom usage calculator for Massachusetts — Custom kWh and scenario cost calculation
Appliance and estimator pathways
- Refrigerator cost in Massachusetts — Appliance operating-cost page for this state
- Refrigerator calculator in Massachusetts — Calculator page for adjusting wattage and usage for this appliance
- Space Heater cost in Massachusetts — Appliance operating-cost page for this state
- Space Heater calculator in Massachusetts — Calculator page for adjusting wattage and usage for this appliance
- Window Ac cost in Massachusetts — Appliance operating-cost page for this state
- Window Ac calculator in Massachusetts — Calculator page for adjusting wattage and usage for this appliance
State comparison pathways for Massachusetts
- Compare Massachusetts with other states — State-to-state comparison hub
- Massachusetts vs California electricity cost — Head-to-head comparison page
- Massachusetts vs Florida electricity cost — Head-to-head comparison page
Discovery and navigation hubs
- Massachusetts electricity hub — Guide to this state's electricity rate, usage, comparison, and tool pages
- Electricity cost scenario hub — Entry point for residential and industry scenario pages
- Massachusetts electricity cost overview — State-level electricity cost page with rates and typical bill context
- Massachusetts average electricity bill benchmark — Typical monthly bill estimate using a standard household usage assumption
- Massachusetts electricity bill estimator — Household profile bill scenarios for this state
- Electricity usage hubs — Browse cost pages by common household usage tiers
Consumer electricity drivers
- Price drivers in Massachusetts — Understand what influences state electricity prices
Source & Method
Source: U.S. Energy Information Administration (EIA) Retail Sales of Electricity. Updated: April 2026. Estimates use the EIA all-in average residential rate — energy, delivery, fixed charges, and utility fees together, not just the electricity itself. Fees are inside the rate, not an extra on top; how your own bill splits fixed versus per-kWh charges varies by utility. For what's inside the all-in rate, see hidden electricity fees; for how rates and estimates are defined, see the methodology hub.