AIR CONDITIONING & MVHR SPECIALISTS IN LONDON
MVHR & commercial maintenance without the guesswork.
MVHR servicing, repairs and airflow balancing, plus planned maintenance for air conditioning and ventilation in London homes, apartment blocks and commercial buildings.
MVHR SERVICE LONDON
If the airflow is wrong, the room will tell you.
MVHR is not simply a box in a cupboard. Filters, fans, heat exchange, condensate drainage, controls, terminals and airflow balance all affect whether the system is doing its job.
Combined AC + MVHR support
For buildings with both comfort cooling and mechanical ventilation, using one engineering relationship can simplify planned visits, reactive faults and reporting — provided the scope remains clear for each asset type.
MVHR maintenance for apartment blocks
Property managers need a repeatable process rather than unrelated appointments. A block programme can include an asset list, access schedule, apartment-by-apartment checklist, filter programme, defect coding, remedial quotations and consolidated reporting.
REAL COMFORT PROJECTS
Mechanical services are part of the building.
For managed and commercial property, access, repeatability and maintainability matter just as much as the finished room.
MORE COMFORT PROJECTS
Built to be maintained, not forgotten.
More examples of installation work by our engineers across London.
MVHR & COMMERCIAL MAINTENANCE GUIDE
MVHR servicing: airflow matters more than appearances
A ventilation unit can look clean and still perform badly. MVHR depends on controlled supply and extract airflow while recovering heat between the two streams. Filters, fans, heat exchanger condition, controls, boost operation, terminals and valves, condensate drainage and ductwork all influence that outcome, so a proper MVHR service goes well beyond changing filters. Where airflow is in question, measurements are more useful than guesswork.
Filters
Filters protect the air path from dust and debris. Heavily loaded filters can restrict airflow and increase fan effort. Replacement should use the correct specification for the unit rather than simply something that fits the opening.
Heat exchanger
The exchanger transfers energy between extract and supply air. Accessible exchangers should be inspected for contamination and cleaned in accordance with equipment requirements. Poor seating or damage can affect performance.
Fans
Supply and extract fans should run smoothly and without unusual bearing or vibration noise. A fault on one side can create imbalance even while the other fan continues to operate.
Condensate drainage
MVHR units can produce condensate. The drain and trap arrangement need to work correctly. Water around the unit, staining or persistent gurgling should be investigated rather than accepted as normal.
Controls and summer bypass
Boost settings, schedules, sensors and summer-bypass behaviour vary by unit. Summer bypass does not provide active cooling; it changes the heat-recovery path under suitable conditions. If it appears not to operate, settings and actual temperature conditions need checking.
MVHR airflow testing and balancing
Good ventilation is measurable. Supply and extract volumes at room terminals can be checked against intended design or commissioning information where available, and compared room by room with adjustments made where the system allows. If one valve is adjusted, the effect on the rest of the system matters, so arbitrary room-by-room turning can create new imbalance. Airflow testing is particularly useful when rooms feel poorly ventilated, and in apartments and managed residential developments.
When is recommissioning useful?
After repairs or fan replacement, significant duct changes, terminal replacement or relocation, refurbishment or when previous settings are unknown and performance is poor. It can also be useful where a building has never performed as expected and there is no reliable record of the original balance.
MVHR repairs & fault finding
Common problems include weak bathroom extraction, stale or stuffy bedrooms, excessive fan noise, persistent condensation, failed boost, controller faults, blocked filters or drains and water around the unit. The engineer needs to separate filter restriction from fan, control, drainage, duct or balance problems rather than assuming every complaint has the same cause. Where water is present, condensate drainage and unit condition should be inspected before damage spreads; where boost fails, controls, switches, sensors, wiring and settings may need testing.
Weak airflow in one room
A single-room issue can involve a terminal, local duct route or previous adjustment. If many rooms are weak, filters, fan performance or broader system restrictions become more relevant.
Condensation despite MVHR
Ventilation can help manage moisture, but condensation also depends on moisture production, room temperature, fabric temperature and occupant behaviour. The system should be checked for airflow and operation without promising that ventilation alone explains every condensation problem.
Noise from MVHR
Identify whether the sound comes from the central unit, ductwork or room terminals. Fan noise, vibration transfer and excessive terminal velocity can require different remedies.
Commercial PPM for air conditioning and ventilation
Property managers and facilities teams need more than isolated call-outs. Planned preventative maintenance should show what equipment exists, what condition it is in, what needs attention now and what can be budgeted for later — the value is better visibility and fewer surprises, not simply visit count. A commercial maintenance contract should also be easy for the property team to administer, with asset identification, access arrangements, planned dates, reporting format and reactive escalation agreed before the first service round.
A maintenance proposal should make clear:
- Which assets and systems are included
- Visit frequency and normal service scope
- Filter or consumable arrangements
- How faults and remedial work are reported
- Reactive call-out arrangements
- Access and operating-hour constraints
- What documentation the property team receives
For one-off air conditioning servicing or repairs outside a maintenance contract, see our air conditioning services.
Asset registers
An asset register gives the maintenance programme a common reference. It can identify equipment type, location and useful reference information so engineers and managers are talking about the same unit when defects are reported.
Condition reporting
Reports should distinguish between a failed item, a developing defect and a general observation. That allows budgets and access to be planned and reduces the chance that every note is treated as an emergency.
Reactive support
PPM does not eliminate breakdowns. The contract should explain how faults discovered between visits are reported, what information the customer should provide and how remedial work is authorised.
Commercial maintenance by property type
Offices
Zoning, occupancy and planned access
Hotels
Guest impact and many distributed assets
Retail
Trading continuity and customer areas
Restaurants
Long hours and high internal gains
Build-to-rent
Repeatable apartment programmes
Managing agents
Reporting and remedial priorities
Server rooms
Critical cooling and rapid escalation
Mixed-use
Different asset types under one management structure
MVHR servicing & commercial maintenance FAQs
Annual professional inspection is common, while filters may need attention more frequently. Usage, environment and manufacturer guidance should inform the plan.
It depends on filter type, environment and usage. Busy roads, dust or pollution may justify more frequent inspection. Follow manufacturer guidance and actual filter condition.
MVHR is normally designed as continuous ventilation with different operating rates rather than equipment that is routinely switched off. Follow the system design and manufacturer guidance.
Possible causes include dirty filters, fan issues, vibration, duct restrictions, high fan settings or poorly adjusted terminals.
Symptoms can include weak supply or extract, persistent humidity or condensation, noise and rooms that do not ventilate as expected. Airflow measurements are needed for a meaningful assessment.
Yes, where terminals and controls are adjustable. Airflow can be measured and the system rebalanced to achieve appropriate supply and extract performance. After a renovation, altered rooms, ducts or terminals can justify new airflow measurements and balancing.
Restricted filters and poor ventilation can reduce airflow and contribute to moisture problems, but heating, insulation, occupancy and moisture generation also matter. Airflow and wider building conditions should be assessed rather than assuming one cause.
MVHR is primarily ventilation with heat recovery. Summer bypass can reduce unwanted heat recovery in suitable conditions, but it is not active air conditioning.
Yes. Portfolio servicing is best organised around an asset register, access plan, consistent checklist, filter schedule and consolidated reporting.
Planned maintenance can reduce surprise failures and gives property teams better visibility of equipment condition and remedial priorities.
Building type, approximate asset count, existing asset list if available, access constraints, current maintenance frequency and whether reactive support is required.
It is a structured record of equipment being managed, normally identifying what the asset is and where it is so maintenance and fault records can be tied to the correct unit.