To estimate the electricity cost of drying equipment, multiply the equipment’s input power in kilowatts by the hours run and your electricity plan’s cents-per-kWh rate. Record the calculation, the equipment hours and the rate used so the cost can be discussed clearly.
How do you calculate the cost of a dehumidifier?
Formula: (watts ÷ 1,000) × hours run × electricity rate per kWh = estimated electricity cost.
For example, an 800-watt unit running for 24 hours uses 19.2 kWh. If the applicable electricity rate is 30 cents per kWh, the estimated daily electricity cost is $5.76. This is an illustration only: equipment ratings, operating hours and plan rates differ.
Drying equipment electricity-cost chart
| What to record | Where to find it | Why it matters |
|---|---|---|
| Rated input power (watts) | Equipment label or supplier documentation. | Shows the maximum rated draw used in the calculation. |
| Operating hours | Hour meter, technician log or agreed equipment record. | Supports a transparent calculation for the actual drying period. |
| Electricity rate (c/kWh) | The current electricity bill or plan. | Rates vary by retailer, plan, time of use and location. |
| Number of units | Equipment placement record. | Lets you calculate each unit and the combined estimated load. |
Worked example: indicative daily drying cost
| Equipment | Rated power | 24-hour energy use | Example at 30c/kWh |
|---|---|---|---|
| Dehumidifier | 800W | 19.2 kWh | $5.76 per day |
| Air mover | 300W | 7.2 kWh | $2.16 per day |
| Air scrubber | 250W | 6.0 kWh | $1.80 per day |
These examples are illustrative only, not a quote or a guaranteed bill amount. Check each unit’s label and your actual rate. Equipment may cycle on and off or run under conditions that affect consumption.
Who usually pays for drying electricity in a rental?
For a rental property affected by flooding, Tenancy Services says the landlord is responsible for drying water-damaged property and paying tenants’ electricity charges incurred. The circumstances still matter: keep the landlord or property manager informed, retain the equipment and electricity records, and check the tenancy agreement and insurer’s requirements for the particular event.
Why industrial drying can be more cost-effective than waiting
Visible water may be removed while moisture remains in carpet backing, wall bases, floor edges and cavities. A measured drying plan uses suitable equipment, closed drying conditions where appropriate, and moisture monitoring to guide decisions. The aim is to dry affected materials efficiently and avoid prolonged dampness or premature reinstatement.
How to keep a drying job efficient
- Follow the technician’s placement advice. Do not block equipment intakes or outlets.
- Keep the drying area controlled. Doors and windows should be managed according to the drying plan, not left open by default.
- Record changes. Note when equipment is moved, switched off for safety, or collected.
- Use moisture checks. Drying should be guided by conditions in the affected materials, not only by elapsed time.
Frequently asked questions
How much electricity does a dehumidifier use per day?
Divide its wattage by 1,000, multiply by the hours it operates, then multiply by the electricity rate. A unit rated at 800W running continuously for 24 hours uses 19.2 kWh before any variation in operation is considered.
Can I turn drying equipment off overnight?
Only if the restoration provider says it is safe and appropriate. Unplanned interruptions can slow progress and change drying conditions. Tell the provider if a unit must be switched off.
Does insurance cover drying electricity?
Cover depends on the policy, insurer and circumstances of the event. Keep the equipment log, electricity calculation, invoices and claim correspondence, then ask the insurer what evidence it requires.
How long will drying equipment run?
There is no reliable one-size-fits-all period. Drying time depends on the water source, materials affected, temperature, humidity, access and measured moisture conditions.
Need flood restoration or carpet drying in Auckland? Carpet Drying Force can assess the affected materials, set up a documented drying plan and provide clear equipment records.
