Roommate Wastes Electricity? How to Stop It

The AC is set to 65 in an empty bedroom. Every light is on at 2pm. The TV is “background noise” for a room no one is in. Your electric bill jumped from $90 to $180 over three months and you know exactly why.

When a roommate wastes electricity, it’s annoying because you’re paying for it. Half their behavior shows up in your half of the bill. Here’s how to actually fix it instead of just turning lights off behind them and quietly fuming.

Why this feels worse than it sounds

It’s not really about the lights. It’s about feeling like you’re being charged for someone else’s habits. When the bill is split 50/50 but the usage is 30/70, the math feels rigged. That’s the part that gets under your skin — and the part most “have a conversation” advice misses.

So the fix is two-part: change the behavior where you can, and change the split where you can’t.

How do I get my roommate to stop wasting electricity?

Have one specific conversation, not a vague “we should save energy” speech. Specifics work because they’re hard to argue with. Try:

“Hey, our electric bill was $180 last month, up from $90 in April. I think the AC is running when no one’s home. Can we set it to 75 when we both leave?”

That works because it:

• Names a real number
• Identifies one habit, not “everything you do”
• Proposes one specific change
• Frames it as “we” instead of “you”

Most roommates will agree to one specific thing. They will not agree to a lecture.

What’s a fair way to split the bill if my roommate uses way more electricity?

If the behavior doesn’t change, change the math. A few options:

Usage-weighted split. Instead of 50/50, split by who’s home more or who uses what. If your roommate works from home and you’re at the office five days a week, a 60/40 or 70/30 split is honest. This works best when the usage gap is obvious and acknowledged.

Room-based premium. If one roommate has a bigger room with more lights and runs their own AC unit, add a flat monthly premium to their share — $20–$40 — to account for it.

Cap-and-overage. Set a target monthly bill, say $100. Anything under, split 50/50. Anything over the cap gets billed to whoever caused the spike (usually obvious — the AC was on all month while you were on vacation).

For more on splitting fairly, our guide on how to split the electric bill fairly with roommates covers the math in depth.

What if they don’t believe they’re the problem

This happens a lot. They’ll say “I barely use the AC.” Two ways to handle it:

Show the data. Pull up the last three bills side by side. Point at the jump. Ask what changed in the apartment during that window. The answer is almost always obvious.

Use the utility app. Most providers now have an app that shows daily usage. Open it together. When the spike days line up with their work-from-home days or the days they had their partner over with the AC blasting, the conversation gets a lot shorter.

You’re not trying to win. You’re trying to get to a number you both agree on.

How can I lower the electric bill without nagging

A few low-effort changes that actually move the number:

• Smart plugs on TVs, monitors, and consoles — kill phantom draw when no one is using them
• Set the thermostat schedule so AC ramps up before you both get home but isn’t running all day
• LED bulbs in every common area — the cost pays back in two months
• One “lights out” check before bed, agreed on by both of you, so no one’s room-by-room hunting

These work because they remove the need for your roommate to remember anything. The systems do the work.

What if nothing changes

If your roommate won’t change the behavior, won’t agree to a new split, and the bill keeps climbing, you have a fairness issue that goes beyond electricity. At that point it’s worth asking whether the living situation works at renewal time. Don’t blow up the lease over an AC fight — but don’t sign another one without resolving this either.

How homies handles this

homies pulls in your shared utility bills, lets you set a custom split (50/50, 60/40, usage-based, whatever you both agree on), and tracks the monthly trend so a $90 bill becoming a $180 bill is visible to both of you — not just you. When the chart is there, the conversation gets a lot easier.

rooming, minus the drama. Join the waitlist at joinhomies.app.