Hiring a dehumidifier: equipment, duration and total cost
A low daily rate is only part of the bill. The equipment must also suit the moisture problem and premises, the required duration and the support included. A clear request helps distinguish equipment-only hire from professionally managed drying.
When is a hired unit enough?
Building dehumidifiers remove moisture from the air and can therefore help damp materials dry. They do not repair leaking pipes, faulty waterproofing or other sources of incoming water.
After water damage, the affected areas must be identified first. Moisture beneath a floor or in cavities cannot automatically be removed by one unit standing in a room. If water is still escaping or standing in the property, professionals need to make the situation safe first; a hire request does not replace emergency assistance.
| Situation | What the request should explain |
|---|---|
| New build or renovation | Rooms and materials that need drying; coordination with subsequent building work. |
| Damp cellar or living space | Indoor conditions, use and whether the moisture source is known or needs investigating. |
| After water damage | Progress with repairing the cause, affected rooms and any need for measurements or supervised drying. |
The right capacity depends on more than floor area
Ceiling height, layout, temperature and incoming moisture affect equipment selection. Two separate rooms may need a different setup from an open space of the same area. A tall hall contains more air than a lower room with the same floor area.
A unit’s litre rating applies under particular test conditions. Actual water extraction can be substantially lower in cold or less humid rooms. Compare more than the largest number in the product name: ask the supplier to confirm suitability for your conditions.
Condensation and adsorption units have different applications. Heaters and fans are not automatically necessary either. The hire company should select the combination for the project; you do not need to guess the technology or number of units in your initial request.
Which costs belong in the comparison?
Compare offers for the same expected duration and scope. Weekly and long-term rates cannot simply be calculated by multiplying a daily rate. Also establish when charging starts, how part-days count and when hire ends on return.
- Equipment and accessories. Ask for hire charges, unit numbers and any required hoses, pumps, fans or measuring equipment to be listed separately.
- Transport and setup. Delivery, return transport, carrying equipment upstairs, installation and instruction are not necessarily included in the unit price.
- Operation and supervision. Include electricity, agreed inspection visits and moisture measurements. Equipment-only hire does not automatically include monitored drying.
- Hire conditions. Check VAT, minimum hire, extensions, cleaning and any liability terms. A refundable deposit initially ties up money; it is not automatically a final expense.
Worked example: hire plus electricity
This example uses assumed figures, not market prices: one unit hired for 14 days at CHF 20 per day including tax costs CHF 280 in rent.
An assumed average draw of 0.6 kW for 24 hours a day uses 201.6 kWh over 14 days. At an equally hypothetical electricity rate of CHF 0.30 per kWh including tax, this costs CHF 60.48. The subtotal is CHF 340.48, excluding transport, accessories and additional support.
Replace these assumptions with your actual hire terms and electricity tariff. The maximum wattage on the equipment is not necessarily its average consumption. Heaters and further dehumidifiers add to it; a suitable energy meter records actual use.
The end of hire is not necessarily the end of drying
The time needed depends on the materials, absorbed moisture, construction and indoor conditions. Planning a week’s hire therefore does not guarantee that a building element will be dry or ready for new flooring afterwards.
Agree who will assess progress and whether appropriate material measurements are required. A hygrometer describes the room air, not automatically the residual moisture in a screed. Less water collecting in the tank alone does not demonstrate that drying is complete either.
If the duration is uncertain, ask for an initial period with clear extension and return terms. This avoids both an unnecessarily long booking and stopping too early simply because of the charging arrangement.
Setting up, operating and returning the equipment
Clarify the available space and responsibilities before handover. The specific model’s operating and transport instructions apply; hiring equipment is not a reason to alter electrical installations yourself.
- Plan transport. Allow for weight, vehicle capacity, stairs and carrying assistance. Self-collection makes sense only if both outward and return journeys can realistically be arranged.
- Get setup instructions. Agree power supply, clear airflow and safe condensate drainage. Wet or damaged electrical installations need professional attention first.
- Assign supervision. Decide who empties the tank, checks the hose or pump and reports faults. Operation and ventilation should follow the agreed drying plan.
- Record completion. Retain measurements where agreed, arrange return and record meter readings and equipment condition at handover.
What should a useful quote contain?
A comparable quote specifies suitable equipment, hire duration and total cost, together with transport, instruction and requested checks. For a longer project, ask for an alternative weekly or monthly rate too.
The initial request needs the reason, approximate area, layout, whether rooms are heated, timing and desired support. If the precise moisture source or duration is unknown, advice can be part of the job. Leak detection, mould removal and building repairs are additional services that should be expressly agreed.
Frequently asked questions
Do I need to know how many units I need?
No. Describe the rooms and the reason for hiring. The supplier should use this to select the type and number of units, asking for details or suggesting a site visit where necessary.
Can a dehumidifier work in a cold cellar?
That depends on the model and actual temperature. Mention unheated or very cold rooms in the request. Operating limits and technology must suit the conditions; adding a fan heater is not a universal solution.
Is electricity included in the hire price?
When the equipment uses your electricity supply, you usually pay for consumption separately through your tariff. Check the specific terms and include additional equipment such as heaters.
Can I hire without knowing the exact duration?
Yes. Ask for an initial period that can be extended. Check charges for extra days, equipment availability and the return process.
Does hiring the equipment resolve water damage?
No. The cause, affected building elements and required drying need assessment. Measurements, insulation-layer drying, cleaning and repairs are not automatically included in equipment hire.
