Guide
It's hard to cut a bill when you don't know where the money is going. This guide gives ballpark monthly running costs for common household appliances and — more usefully — the simple formula to estimate any device yourself. Real numbers depend on your local rate and how much you actually use each appliance, so treat these as starting points, not precise figures.
Every appliance cost comes down to one calculation: watts ÷ 1,000 × hours used × price per kWh. The result is dollars per period. A 1,500-watt space heater running 5 hours a day at 19 cents per kWh costs 1.5 × 5 × 0.19 = about $1.43 a day, or roughly $43 a month. Find your own price per kWh on your bill — it's usually printed near the usage total — or use the current U.S. residential average of 18.83 cents (April 2026) from the EIA Electric Power Monthly as a stand-in.
The table below assumes typical usage and an average U.S. residential rate. Your rate and habits will shift these up or down.
| Appliance | Typical use | Est. monthly cost |
|---|---|---|
| Central air conditioning | Heavy summer use | $45–$130+ |
| Electric water heater | Daily household | $45–$65 |
| Refrigerator | 24/7 | $8–$16 |
| Electric clothes dryer | 5 loads/week | $11–$20 |
| Space heater (1,500 W) | 5 hrs/day | $40–$50 |
| Dishwasher | Daily | $5–$9 |
| EV charging | ~1,000 mi/mo | $25–$45 |
| Desktop PC / gaming | Several hrs/day | $6–$16 |
National data confirms which appliances dominate. The U.S. Energy Information Administration reports that in the average home, air conditioning is about 19% of annual electricity use, space heating about 12%, and water heating about 12% — with refrigerators and lighting the next-largest end uses. In other words, three temperature-related jobs account for well over a third of the typical bill before you even count the fridge. You can see the full breakdown on the EIA's electricity-use-in-homes page.
Your refrigerator: a modern fridge draws roughly 350–500 kWh a year. Take 450 kWh × $0.19 = about $86 a year, or around $7 a month. A failing 15-year-old unit can easily use two to three times that — which is why an old second fridge in the garage is a classic hidden cost.
Your electric dryer: a typical load uses about 3 kWh. Five loads a week is roughly 15 kWh, or about $2.85 a week at 19 cents — call it $12 a month. Air-drying even half your loads cuts that in half. The math is always the same three numbers: watts (or kWh), hours, and your price per kWh.
Because heating, cooling, and water heating dwarf everything else, that's where your attention pays off most:
Links to Amazon are affiliate links — as an Amazon Associate we earn from qualifying purchases at no cost to you.
Chasing phantom loads on chargers matters, but it's a rounding error next to your air conditioner. Prioritize accordingly.
Individually, always-on devices are cheap; collectively they're not. A game console left in an always-ready state, a set-top box, a second refrigerator, and a rack of chargers can together draw 50–100 watts around the clock. At 75 watts continuous and 19 cents per kWh, that's 0.075 × 24 × 30 × 0.19 ≈ $10 a month — roughly $120 a year for electricity you're barely using. A switched power strip on the entertainment center and home office reclaims most of it.
Central air conditioning is the reason many bills double from spring to midsummer. A 3.5-kW central system running 6 hours a day through a hot week uses about 21 kWh a day — roughly $4 daily, or about $120 over a heavy month, at 19 cents. Raising the thermostat a few degrees, running ceiling fans, and keeping the unit serviced so it isn't overworking all pull that number down. Because cooling is the single most weather-sensitive load, it's also where a smart thermostat pays back fastest.
You don't need to measure everything — just the handful of loads that matter. List your air conditioner or heat pump, water heater, dryer, refrigerator, and any EV or space heater; estimate the hours each runs; and apply the watts ÷ 1,000 × hours × rate formula to each. Sum those five or six lines and you'll typically account for 70–80% of your bill. The remaining lighting, electronics, and small appliances round out the rest and rarely repay the effort of measuring individually. Start with the appliance that runs the most hours at the highest wattage — in most homes in summer, that's the air conditioner.
How do I measure an appliance's exact draw? A plug-in watt meter (around $25) shows real-time watts and accumulated kWh, removing all the guesswork for anything that plugs into a standard outlet.
Why is my summer bill so much higher? Air conditioning is the single largest swing factor — it barely registers in winter and can add $45–$130+ a month in peak summer, which is why bills often double from spring to July.
Do "energy vampires" really matter? They're real — often $100–$150 a year for a typical home — but modest next to HVAC and water heating. Tackle the big loads first, then reclaim standby draw with power strips.
Once you know what your big appliances cost, our electric bill forecast tool puts it in context and projects where your total is heading. For standard appliance energy-use data and efficiency guidance, Energy.gov and the U.S. Energy Information Administration are the authoritative references.