A typical apartment in the United States uses about 54.4 million BTUs of energy per year, which translates to roughly 660 kWh of electricity per month when combined with natural gas or other fuel sources. That’s about half the energy a detached single-family home consumes. Your actual number depends on your apartment’s size, age, climate zone, and how many energy-hungry appliances you run.
The Average Apartment vs. a House
The gap between apartments and houses is striking. EPA data drawn from the Residential Energy Consumption Survey shows that a multifamily apartment unit uses about 54.4 million BTUs per year, compared to 108.4 million BTUs for a detached single-family home. Townhouses and row houses land in between at roughly 89.3 million BTUs. The reasons are straightforward: apartments are smaller, and shared walls, floors, and ceilings mean less surface area exposed to outdoor temperatures. A middle unit in a large building is essentially insulated on most sides by other heated or cooled apartments.
In electricity terms alone, most one-bedroom apartments use somewhere between 500 and 750 kWh per month, while two- and three-bedroom units can push 750 to 1,000 kWh or more. At the current national average residential electricity price of about 17 cents per kWh, that puts a typical apartment electric bill between $85 and $170 per month. If your apartment also uses natural gas for heating or cooking, add another $30 to $80 depending on the season.
Where the Energy Actually Goes
Heating and cooling dominate. Air conditioning accounts for roughly 16% of household electricity use, and space heating adds another 10%. Water heating takes about 9%. Together, those three functions consume more than a third of your total energy.
After climate control, the biggest electricity draw is your refrigerator, which runs 24 hours a day and accounts for about 14% of household electricity. Lighting adds around 9%. The remaining share goes to everything else: your washer and dryer, dishwasher, oven, TV, and the constellation of smaller electronics scattered around your apartment.
Phantom Loads Add Up Quietly
Devices that appear to be “off” still draw power. A University of Oregon study that metered three apartments found that phantom loads, the trickle of electricity consumed by plugged-in devices in standby mode, accounted for 33% of total metered energy use. That number is higher than most people expect.
Individual devices don’t seem like much on their own. A microwave in standby pulls about 2.7 watts. A gaming console draws 2.9 watts. A desktop computer uses 2.6 watts even when shut down, and a printer that was never once used during the study still consumed 6.3 watts around the clock, representing 5% of total metered energy by itself. Laptops were the lightest offenders at about 1.4 watts. But when you add up every charger, speaker, set-top box, and appliance with a clock or standby light, the combined draw becomes meaningful. Unplugging devices you rarely use, or connecting entertainment centers to a power strip you can switch off, is one of the simplest ways to trim your bill.
Climate and Location Make a Big Difference
Households in colder states consume more total energy than those in warmer states, largely because heating demands more energy than cooling. Midwest homes, particularly older ones, burn significantly more natural gas than the national average. In the warmest parts of the South and Southwest, nearly 5% of households don’t use space heating at all, which eliminates one of the largest energy categories entirely. But those same households may run air conditioning eight or nine months of the year, which shifts the load to electricity.
Where you live also affects your rate. The national average is about 17 cents per kWh, but state-level prices range from under 10 cents in parts of the Mountain West to over 30 cents in Hawaii and parts of New England. An apartment using 700 kWh per month costs $70 in a cheap-electricity state and $210 in an expensive one.
Why Building Age Matters So Much
An apartment built in the 1960s and one built in 2020 can have dramatically different energy profiles, even if they’re the same size in the same city. The biggest factor is insulation. Older buildings often have minimal wall insulation, single-pane windows, and air leaks around doors, outlets, and window frames. Every gap is a path for heated or cooled air to escape, forcing your HVAC system to work harder.
The Department of Energy recommends insulation levels based on climate zone, and the requirements increase substantially as you move from warm southern zones to cold northern ones. In colder climates (zones 5 through 8), walls should have significantly higher insulation values, and attics need the heaviest insulation of all. Most pre-1980 apartments fall well short of these standards. If your apartment has old single-pane windows and you can feel drafts around the frames in winter, your heating costs are likely 20% to 30% higher than they would be in a modern, well-sealed unit.
Modern buildings designed to meet energy efficiency standards perform substantially better. Buildings that earn ENERGY STAR certification, which requires scoring in the top 25% compared to similar buildings nationwide, use about 35% less energy and cost roughly $0.54 less per square foot to operate than average. If you’re apartment hunting and energy costs matter to you, newer construction or certified green buildings will consistently deliver lower utility bills.
Practical Ways to Estimate Your Own Usage
Your utility bill is the most accurate source, but if you’re moving to a new apartment and want to estimate ahead of time, start with these rough benchmarks for monthly electricity use:
- Studio or one-bedroom: 400 to 700 kWh
- Two-bedroom: 600 to 900 kWh
- Three-bedroom: 800 to 1,200 kWh
Then adjust upward if the building is older, you’re in an extreme climate, or you run window AC units (which are far less efficient than central air). Adjust downward if the building is newer, you’re on a middle floor with units above and below you, or you use LED lighting throughout. Electric heating in cold climates can easily double winter bills compared to summer, so ask the landlord or previous tenant about seasonal swings before signing a lease.
You can also ask the utility company for the average usage history at a specific address. Most providers will share 12 months of historical consumption data for any unit, giving you a realistic picture of what to expect across all four seasons.