How to Lower Your Electric Bill: a $25 Meter Audit

A friend in central Florida sent me her July electric bill last summer. $340 for a three-bedroom house, two adults, a teenager, and a dog. She wasn’t running anything unusual. The AC was set to 76°F. There was no pool. The math just didn’t make sense to her, and the utility’s “energy use tips” page was the same recycled list of “unplug your phone charger” advice that hasn’t moved a meaningful number on a real bill in fifteen years.

We did an audit on a Saturday afternoon. It took about 90 minutes. The total of things we found was $32/month, none of which had anything to do with phone chargers. The biggest single offender was a 12-year-old chest freezer in the garage drawing nearly twice what its replacement would, in 95°F ambient air, running essentially constantly. The second was a desktop PC and dual-monitor setup that the teenager left on 24/7 because “it takes too long to start up”. The third was a dehumidifier in a basement that didn’t need one any more.

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The audit, in order

You need one tool. A plug-in electricity meter that sits between the wall outlet and the device, measures actual draw in watts and kilowatt-hours, and lets you read off cost per day, week, month, and year. The category-defining one has been on Amazon for twenty years and still costs about the same as a takeout pizza.

The audit itself is a list. Walk the house with the meter and a notebook (or your phone, but a notebook keeps you off the phone). Plug the meter into the wall, plug the device into the meter, leave it for at least an hour for steady-state appliances and at least 24 hours for cycling appliances (fridge, freezer, dehumidifier, AC). Write down the kWh reading and the device.

Start in this order, because this is roughly the order in which the surprises show up:

1. Old chest freezer or second fridge in a garage, basement, or utility room. This is the single most likely source of an unexpectedly high bill. A pre-2010 freezer in 90°F ambient draws roughly 2-3x what a current Energy Star one does, sometimes worse if the door seal has gone.
2. Always-on desktop PC, gaming setup, mining rig, or NAS. A modern gaming PC at idle pulls 80-150W. Run that 24/7 and you’re looking at $10-25/month in pure idle electricity, before the actual use.
3. Dehumidifier or pool pump running on the wrong schedule. Both are big motors. Both are easy to set on a timer and forget about.
4. Old plasma TV or large CRT monitor. Yes, a few of these are still in service in 2026. They are 3-5x as power-hungry as modern equivalents.
5. Anything with a heating element. Electric kettles used for one cup at a time, electric space heaters, electric towel rails, electric underfloor heating in the bathroom that nobody remembers turning on.
6. The AC handler. Worth checking in summer. Old central-air systems are massively variable. This one usually doesn’t need a Kill-A-Watt because it shows up on the bill as the dominant line item already.

The Florida household’s freezer hit 2.4 kWh/day on the meter. At their utility’s $0.16/kWh, that’s $11.50/month, roughly twice what a current Energy Star equivalent (~1.1 kWh/day) would cost. The replacement paid for itself in under two years and the bill went down by $6/month immediately.

What you do once you’ve found the offender

Three options, in order of cost. Pick whichever fits the situation:

• Schedule it. A $25 four-pack of smart plugs is the cheapest fix for anything that doesn’t need to be on 24/7. A teenager’s PC, monitors, the home-office printer, the secondary TV nobody actually watches. Set them to power off from midnight to 6am and you’ve cut idle by a quarter immediately, with no behaviour change required.
• Move it. A second fridge or chest freezer in a hot garage works twice as hard. Moving it to the basement or even the coolest corner of the house can drop its draw by 30%.
• Replace it. Only if the math actually works. A $700 new chest freezer to save $5/month takes 12 years to pay back, which is the lifespan of the freezer, which is a wash. A $350 mid-range Energy Star fridge to replace a 1998 unit drawing $25/month above current is paid back in 14 months and saves money for the next decade.

The $25 smart-plug fix is the highest-leverage move on this list and the one most people skip because it sounds fiddly. It isn’t. The setup is “plug in, scan QR code in app, set a schedule”. Five minutes per plug.

What nobody tells you about Kill-A-Watt audits

The fine print, in order of how often it ruins someone’s experiment:

• Don’t trust a one-hour reading on a cycling appliance. Fridges, freezers, dehumidifiers, and ACs cycle on and off. The honest measurement is at least 24 hours, ideally 72. The on-cycle wattage is interesting but the kWh-over-time number is the one that matches what your utility charges for.
• Surge protectors and UPSes mess with the meter. Plug the appliance directly into the Kill-A-Watt, not through anything else. The meter has overload protection built in, so you don’t need a surge strip in front of it.
• Cost setting matters. The first time you use the meter, set the cost-per-kWh to your actual rate from your utility bill (not the default 0.10 it ships with). Otherwise the cost numbers are fiction.
• Devices that don’t have a standard plug are off-limits. Hardwired electric heaters, your AC compressor outside, anything 240V (US dryers, ovens, EV chargers). For those you need a whole-house energy monitor, which is a different article on the pipeline.
• The audit only finds the things you plug it into. It will not find lighting circuits, hardwired bathroom heaters, or the pool pump if it’s hardwired. Walk the whole house with a notebook of “what’s plugged in where”, not just the obvious stuff.

When this advice does NOT apply

• Your bill is high because of AC, full stop. If you live in Phoenix or Miami and your summer bill is $300+, the audit will probably find $30-50/month of leaks, but the structural fix is insulation, weatherstripping, and the AC itself. Don’t let this article convince you that smart plugs will fix a thermal envelope problem.
• You rent and you can’t replace appliances. Most of the wins on this list assume you control the fridge and the freezer. If you don’t, your audit becomes “schedule the things you do own and live with the rest”.
• You’re already on a time-of-use plan and shifting load. If you’re already running the dishwasher at midnight and the dryer on weekends, you’ve done the easy version of this audit and you should be hunting for vampire loads with a whole-house monitor instead.

The closer

For the Florida family the recovered amount was $32/month: $11 from the freezer, $14 from the teenager’s PC and monitors on a smart-plug schedule, $7 from the dehumidifier they realised they didn’t need any more. Total spend on the audit kit: about $55. The payback was the second month. After that the saving compounds quietly into the same bill, every month, indefinitely.

The budget calculator will show you what a recovered $32/month does to a household compounding it across the year. It’s around $384, which is meaningfully more than the kit costs and substantially less effort than most people assume.

The trick is doing the audit before the bill arrives, not after. The freezer was working twice as hard last August too, and the August before that. The information was always there. You just needed something between the wall and the freezer to read it off.