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Air conditioning hire or buy: what makes sense for a business?

Updated 23 October 2026 · SEO Dons Editorial

When does hiring make sense?

Hire fits a need that is short, uncertain or urgent: cooling while a failed system is repaired, bridging a planned replacement, an event, a seasonal peak or a standby for a server room. Buying fits a permanent load. The sums below show where the line falls, and the chiller cost guide carries the purchase side, including a table of seller list prices dated 30 September 2026.

This page quotes no hire rates. They vary with duration, distance and site conditions, so get the figures in writing, dated, for your own period. For portable units see commercial portable air conditioning, and for server rooms see server room cooling requirements.

Hire or buy: how do the trade-offs compare?

FactorHireBuy
Suited toShort, uncertain or emergency needPermanent or long-running load
Shape of costRental, plus delivery, connection, power or fuel and collectionCapital and installation, then upkeep and finance
TaxOwnership is needed to claim plant and machinery allowancesMay qualify for capital allowances
F-gas dutiesDepend on the rental agreementRest with whoever operates the equipment
Choice of equipmentWhat the hire fleet holdsSpecified for the building
Upkeep and breakdownSet by the contractYour own maintenance arrangements

How do you work out the break-even point?

Let C be the total cost of buying and installing, including electrical work and commissioning. Let H be the monthly hire cost, with delivery, connection and collection spread across the hire period. Let O be the monthly cost of owning apart from the purchase: maintenance, F-gas checks and finance. Break-even in months is C divided by (H minus O).

A hypothetical illustration, using ratios rather than prices. Suppose buying and installing costs 24 times the monthly hire charge, and owning adds a quarter of one month's hire charge each month. Break-even is 24 ÷ (1 − 0.25) = 32 months. A need shorter than 32 months favours hire and a longer one favours buying, before tax, resale value and availability.

Check the inputs. Ask whether the hire quote carries a minimum period. Purchase quotes should show installation separately from equipment. The cost guide's list-price table covers equipment only, so installation has to be added. If the same plant would be bought anyway in a year or two, hiring in the meantime may beat a stop-gap repair, and how long commercial air conditioning lasts helps judge that.

What does GOV.UK say about capital allowances and hired equipment?

Only the points GOV.UK states are given here. Capital allowances apply to plant and machinery, and the list of integral features includes "air-conditioning and air cooling systems". In most cases the full cost of qualifying items can be deducted from profits using the annual investment allowance. But GOV.UK says you cannot claim on "things you lease (unless you have a hire purchase contract or long funding lease) - you must own them". A short hire is not ownership, so a hirer should not expect allowances on it.

That makes hire purchase a third route between hiring and buying outright. How a hire or lease charge is treated in your accounts is a question for an accountant, and HVAC capital allowances sets out the purchase side.

Who carries the F-gas duties on hired equipment?

The Regulation defines the operator as "the natural or legal person exercising actual power over the technical functioning of products and equipment", and leak checks fall on operators of equipment holding 5 tonnes of CO2 equivalent or more. GOV.UK adds: "If you rent out equipment, you may be responsible for leak checks rather than the end user, depending on the rental agreement." So ask for the allocation in writing, along with who keeps the records. Operators must keep "the dates and results of the checks", and GOV.UK says a company must be certified to install, repair, maintain or decommission F-gas equipment. More on the duties is in F-gas regulations explained.

What about power, exhaust and ducting?

Electrical supply. A hired chiller or portable unit still needs a safe supply of adequate capacity. The Electricity at Work Regulations require that "All systems shall at all times be of such construction as to prevent, so far as is reasonably practicable, danger", and that anyone doing work needing technical knowledge has it or is supervised. Establish capacity and the connection point first (see air conditioning electrical supply).

Portable units. The ecodesign rules define a single duct air conditioner as one where the intake air is "introduced from the space containing the unit and discharged outside this space". The exhaust duct must therefore reach somewhere suitable, and the air taken from the room is replaced from elsewhere. For engine-driven plant, the Workplace Regulations say a method of cooling "shall not be used which results in the escape into a workplace of fumes, gas or vapour" likely to be injurious or offensive.

Temperature duty. Those regulations require the temperature in indoor workplaces to be "reasonable" during working hours. The HSE says "There's no law for maximum working temperature, or when it's too hot to work", so what counts depends on the work (see workplace temperature law).

What should you ask a hire firm or supplier first?

  • The all-in charge for the period, with delivery, connection, power or fuel, and collection listed.
  • The minimum hire period and what ending early costs.
  • Who connects it, who is competent to do so, and who maintains it during the hire.
  • The refrigerant, charge and F-gas allocation, in writing.
  • What happens if the unit fails during the hire.
  • For a purchase, the installed cost, lead time and who commissions it.

Readers can send an enquiry through the site's form. Cooling bought outright is covered in the chiller cost guide, and the air conditioning replacement guide covers phasing a changeover.

Sources

Common questions

Does a hired chiller need F-gas leak checks?

It depends on the gas it holds and the contract. Leak checks apply to equipment holding F gas equivalent to 5 tonnes of CO2 or more, and GOV.UK says the owner may be responsible rather than the user when equipment is rented out. Get the allocation, and the records, in writing.

Can capital allowances be claimed on hired equipment?

GOV.UK says plant and machinery allowances cannot be claimed on things you lease unless there is a hire purchase contract or long funding lease, because you must own them. A short hire is not ownership. Ask an accountant how hire and lease charges are treated.

The Workplace Regulations require a reasonable temperature in indoor workplaces during working hours. The HSE says there is no law for a maximum working temperature, so what is reasonable depends on the work and the people. A written risk assessment helps.

Why does a portable unit need an exhaust route?

A single duct unit takes air from the room to cool its condenser and discharges it outside the space. The duct has to reach somewhere suitable, and the air taken out is replaced from elsewhere. That is why placement and sealing matter.

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