Days 1–2: separate the bill from the equipment
Gather several bills if available. Record days, kWh, reading status and current charges before looking at the amount due. Budget billing and one-time credits can change a payment without changing energy use. DOE’s home energy checklist is a useful starting reference for collecting bills and inventorying equipment.
Next list major uses: refrigeration, heating or cooling, hot water, cooking, laundry and office equipment. Mark which fuel or account pays for each. A gas water heater should not be assigned an invented electric-heating cost. Note ownership and maintenance responsibility in a rental.
| Item | Available evidence | Next question |
|---|---|---|
| Refrigerator | Exact model and manual | Is annual label energy available? |
| Computer and monitor | Existing power settings | Does system sleep actually activate? |
| AC | Settings and usage schedule | Is the power figure a rating or a measured average? |
| Shared laundry | Price per cycle | Does the tenant pay this separately from the electricity bill? |
Day 3: record an ordinary routine before changing it
Choose a question you can observe with what you already have. You can check whether the monitor sleeps, when a warming plate turns off, or whether lights remain on in an empty room. If your utility already provides daily or interval data, record the units and complete period before interpreting it.
When no consumption measurement exists, record behavior rather than inventing watts. “Monitor remained on for three unused hours” is a useful observation. “That wasted $15” needs an energy figure, schedule and tariff. Photograph only accessible labels; do not open equipment or electrical panels.
Days 4–6: try one suitable change and repeat
Select one optional setting supported by the product instructions, such as a computer sleep timer. Keep the rest of the routine as similar as practical. Record the date, setting, occupancy and unusual weather. Check that work, comfort and normal equipment functions remain usable.
Changing several things at once makes the outcome hard to explain. One lower daily reading is not enough to assign savings to the setting: laundry, cooking and weather may have changed too. Repeat ordinary observations. Preserve food storage, safety systems, medical equipment and required building operation.
Day 7: put the result in proportion
Use a bounded example before considering a purchase. Suppose a repeatable optional load reduction were 0.20 kWh per day. At $0.18/kWh, that is $0.036 per day, $1.08 over 30 days, or $13.14 over 365 identical days. These are hypothetical figures, not measured results from this walkthrough.
A $50 device would take about 3.8 years to recover its cost from that annual saving, even before its own consumption or other costs. If the same adjustment is free, the product has not created that saving. If you cannot verify an energy difference, report the behavior change and keep the dollar estimate provisional.
Choose the next action from the evidence
| What you found | Useful next step |
|---|---|
| An optional setting worked reliably | Keep it and check after the next ordinary billing period. |
| A large estimate rests on unknown power | Look up the exact model or plan a compatible measurement. |
| An appliance no longer performs normally | Send dated symptoms and fault codes to the responsible maintenance contact. |
| A bill remains unexplained | Check dates, rates and reading status with the utility. |
Use kWh per day to compare unequal billing periods; account for season and household changes before attributing a difference. This is an observation plan, not a technical inspection or guaranteed savings program. Some questions need more than a week to resolve.
Seven-day renter energy audit log
A free CSV to use in a spreadsheet app. Fill in your own copy; it contains no automatic formulas and does not upload your bills or readings.
Download seven-day renter energy audit log (CSV)Choose your next step
Continue with the question that matches your next decision:
Sources & further reading
Numerical examples are illustrative unless explicitly described as measured. This guide does not claim hands-on product testing. Read the methodology and editorial disclosure.