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HVAC and Refrigeration

Air-Handling Units

Reduced airflow, unusual noise, repeated alarms or complaints from several rooms can point to a system needing investigation. Describe the symptoms and affected areas without assuming the unit itself is the only possible cause. Duct restrictions and control changes can also alter what occupants experience.

Tell us what needs doing

A property handover or refurbishment is another useful time to establish the equipment's condition. Missing filter records, blocked access or a unit serving a former layout creates practical problems for the new owner. A survey should identify those issues before a maintenance instruction is priced against incomplete information.

What the work can include

The instruction covers the relevant fans, filters, coils, dampers, casing, drainage and controls fitted to the unit. Assessment establishes which sections are present and which connected services they need. Servicing, component repairs, refurbishment and replacement are then defined against that actual arrangement.

Associated property work includes access openings, equipment routes, connections and making good where required. The handover identifies the unit, work completed and further actions. For a shared building, the records also need to make clear which areas the equipment serves so the owner can manage responsibilities and future visits.

Decisions before replacement

A worn component does not automatically require a complete new unit. Compare the condition of the remaining equipment, repair options and suitability for the property's current use. Conversely, repeatedly repairing one component can leave inadequate capacity or a deteriorated casing unaddressed.

Replacement selection considers more than external dimensions. Airflow, treatment requirements, noise, connections and service access all matter. The route into the property also needs checking: a unit assembled within a plantroom cannot necessarily be removed through the existing doorway in one piece. These details belong in the scope before an order is placed.

Assessment and preparation

Provide equipment labels, service records, drawings and the location of the rooms served. Explain occupancy, working hours and any changes made since installation. Photographs of accessible areas help explain access, but customers should not remove covers or enter restricted plant spaces to obtain them.

Identify the owner or manager who controls shared equipment and authorises shutdowns. Include roof access, tenant permissions, loading restrictions and the finishes needing protection. Where the property remains occupied, agree how people will use affected rooms while the system is unavailable. A clear access plan prevents a service visit becoming an unsuccessful attempt to reach the unit.

How the work proceeds

We establish the property requirement and arrange the relevant equipment assessment. Findings distinguish routine care, local defects and questions about the wider air system. The proposed instruction explains the work and any additional investigation needed before replacement can be specified.

Repairs or installation are coordinated with electrical, duct and other service connections. The completed work receives the relevant checks, with operating instructions and component records handed over. If the original complaint concerns room airflow, agree how the result will be assessed there. A running fan alone does not demonstrate that every affected room now receives the intended air supply.

Cost, timing and disruption

Price depends on unit size, component condition, access and the amount of associated property work. Roof equipment and confined plantrooms require different arrangements. Replacement can involve lifting, dismantling, new supports or modified connections that do not arise in a straightforward service.

Agree the working period, tenant communication and reinstatement before starting. A quotation should identify removal and disposal, commissioning, documentation and any separate building work. For routine maintenance, make the included tasks clear and record inaccessible parts. This gives the owner a useful service history rather than a repeated invoice with no explanation of what was reached.

Property and sector applications

Managing agents need shared equipment linked to responsible owners. Offices need plant operation matched to occupied rooms and working hours. Retail premises need access coordinated with stock, deliveries and trading.

Hospitality requires attention to guest areas and the effects of a shutdown. The full service and project offering supports all sectors, including individual premises and larger managed properties. Specialist room uses need their own brief, rather than an assumption that a general-purpose unit serves every requirement.

Local coverage

We cover Northumberland, Tyne and Wear, County Durham and Tees Valley, including Berwick-upon-Tweed, Alnwick, Morpeth, Hexham, Newcastle, Gateshead, Sunderland, Durham, Darlington, Hartlepool, Stockton-on-Tees, Middlesbrough and Redcar.

For remotely managed buildings, nominate an access contact and confirm who can authorise repairs. Multiple properties retain separate equipment records and working arrangements. View all locations.

Frequently asked questions

Is an air-handling unit the same as air conditioning?

An AHU moves and treats air according to its configuration. It can include heating or cooling sections, but the actual functions and connected services need identifying before work is specified.

Can an old casing remain during refurbishment?

Its condition and suitability need assessment. The proposal should explain retained sections, replacement components and the access needed to maintain the revised unit.

Who arranges access to a shared plantroom?

The property owner or authorised manager should confirm permission and the access contact. Include this in the enquiry so the instruction covers the correct equipment and occupiers.

What records should I receive after replacement?

Keep the equipment details, relevant commissioning results, operating instructions and maintenance information. Retain any outstanding actions with those records for the next owner or service visit.

Knowledge and guidance

Read air-handling units explained and HVAC maintenance contracts. HSE ventilation guidance provides the workplace ventilation context.

Related work and enquiry

Explore HVAC and Refrigeration, Ductwork, HVAC Maintenance and Servicing, Asset Maintenance and Building Services Upgrades. Browse services, maintenance, projects and knowledge.

Contact Black & White Property Services with the address, unit information and affected spaces. Include access permissions and the planned property programme so work can be scoped around the building.

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