The House That Used 2000 kWh More Than Its Twin Ne

A few years ago, I got a call from a woman named Diane. She lived in a subdivision where all the houses were built in the same year with the same floor plan. Her next‑door neighbor had the exact same house, same orientation, same appliances. But Diane’s summer electric bill was regularly $80 higher than her neighbor’s. She couldn’t figure out why. She thought maybe her AC was broken. I told her I’d come take a look.

I spent about two hours at her house. I did a blower door test, a duct leakage test, and a thermal scan. I walked through every room. I checked the attic, the crawlspace, the water heater, the refrigerator, the light bulbs, the thermostat schedule. Everything seemed normal. Then I went next door and asked the neighbor if I could do the same audit. He said yes. I found the difference within fifteen minutes. Diane’s neighbor had a programmable thermostat set to 78°F during the day and 80°F when he was at work. Diane kept her thermostat at 72°F all day because she worked from home. That difference of 6‑8 degrees, over the course of a hot summer, added up to about 500 kWh per month. At $0.16 per kWh, that’s $80.

That’s the thing about energy comparisons. People assume that if two houses are identical, their bills should be identical. But behavior matters more than most people realize. The way you use your house has a bigger impact than the house itself.

I’m not saying equipment and insulation don’t matter. They do. But after you’ve sealed the leaks and added insulation, the biggest variable is you. Your thermostat setting. Your laundry schedule. Your shower length. Your refrigerator temperature. Whether you close the blinds. Whether you turn off your computer at night. These things add up.

Diane was shocked. She thought her neighbor must have a more efficient AC. He didn’t. He just liked his house warmer. She decided to try raising her thermostat to 76°F. She was skeptical. She said she’d be uncomfortable. I told her to try it for a week. She did. She said the first two days were warm, but then she adjusted. Her bill dropped $45 the next month. She was still $35 higher than her neighbor, but she was okay with that because she worked from home and needed the house cooler during the day.

Another comparison I did was between two identical apartments in a rental building. One tenant had an electric bill of $90. The other had $160. Same floor plan, same appliances, same insulation. The difference? The first tenant used LED bulbs, unplugged her phone charger, set her water heater to 120°F, and used a drying rack. The second tenant had incandescent bulbs, left everything plugged in, set her water heater to 140°F, and used the dryer for every load. The behavioral gap was huge.

I have a client named Steve who lives in a duplex. His side and the neighbor’s side are mirror images. His electric bill is consistently $50 lower than his neighbor’s. He asked me why. I asked him about his habits. He runs his dishwasher at night, uses the cold water cycle for laundry, and keeps his fridge at 37°F. His neighbor runs the dishwasher at 5 PM, uses hot water for laundry, and keeps the fridge at 33°F. Those small differences add up to about $600 a year.

The fridge temperature is a big one. Every degree below 37°F increases energy use by about 2%. A fridge set to 33°F uses about 8% more energy than one set to 37°F. That doesn’t sound like much, but over a year it’s 50‑100 kWh. At $0.15 per kWh, that’s $7‑$15. Not huge, but it’s free money.

The same goes for the water heater. Most are set to 140°F from the factory. That’s too hot. You can turn it down to 120°F and save about 10% on water heating costs. That’s $20‑$50 a year. And you won’t scald yourself.

Diane ended up making a list of all the little things she could change. She switched to LED bulbs, even though she already had CFLs. She started unplugging her phone charger. She set her water heater to 120°F. She started closing her blinds on south‑facing windows during the day. Those changes saved her another $30 a month. Her bill eventually got down to within $10 of her neighbor’s. She was satisfied.

The point is that you don’t need a new AC or solar panels to cut your bill. You need to look at what you’re doing. Keep a log for a week. Write down every time you use a major appliance. Note your thermostat setting. Note when you turn off lights. You’ll find patterns. Then change one thing at a time.

I have a tool that helps you compare your usage to similar homes.