AHU Controller Solutions & Upgrades
Independent AHU
controller solutions.
01256 518170We offer fully independent controller supply, installation, and commissioning.
AHU Controller Solutions & Upgrades
Independent AHU
controller solutions.
Unlike AHU manufacturers who only supply controllers on the condition their engineers do the work, we offer fully independent supply, installation, and commissioning.
01256 518170Independent
Supplier
All Makes
& Models
40+
Yrs ExperienceYears Experience
Trusted by leading organisations
The problem
What Problems
We Often See
Energy Waste
AHUs with outdated or misconfigured controls run fans, heating, and cooling when they should not. Every hour of unnecessary operation adds to the energy bill, and goes unmeasured.
No Visibility
Older controllers have no network connection and no BMS integration. When something goes wrong, or performance degrades gradually, there is no alarm. The problem runs until it becomes a failure.
Parts Obsolescence
Proprietary controllers from discontinued ranges cannot be repaired when they fail, only replaced. The older the system, the more fragile the supply chain.
Supplier Lock-In
Proprietary systems require the original supplier for maintenance and changes. Open-protocol controls give FM teams the freedom to choose any competent engineer.
Make the right call
Controller Upgrade vs Full AHU Replacement
Both are valid routes. The right answer depends on the root cause of the problem and the condition of your plant, which is why we carry out an independent assessment before recommending either.
Controller Upgrade
Full AHU Replacement
AHU plant
Retained and extended
Removed and replaced
BMS integration
Included on most installations
Depends on specification
Energy performance
Improved through controls optimisation
Depends on new plant specification
Right when
Controls are the root cause
Mechanical plant is at end of life
Consider if
Plant is mechanically sound
Structural or mechanical failure present
Every project is different, so speak to our team for an honest assessment of what's right for your site and system. No commitment required.
Independent & Flexible
No Manufacturer Tie-In,
No Unnecessary Costs
Our AHU controller solutions offer a flexible, cost-effective alternative to manufacturer-tied services, which often require their own engineers and increase costs.
We supply, install, and commission controllers across any AHU make or model, giving you full independence to choose the right solution without single-supplier restrictions.
Any AHU brand
We work across all makes and models. Brand-agnostic assessment, specification, and installation.
Open protocol as standard
BACnet, Modbus, and LON. Any competent engineer or BMS platform can read and write the system after handover.
Qualified engineers
Every project carried out by engineers with extensive experience in fault-finding, upgrades, and commissioning.
The solution
Open Protocol Controllers:
BACnet, Modbus and LON
Open-protocol controls use standard communication languages that any qualified engineer or BMS platform can read and interact with. They integrate directly with your existing BMS regardless of manufacturer.
Proprietary systems lock maintenance, upgrades, and changes to a single supplier, creating long-term cost and dependency risks over the system lifecycle.
We standardise on open-protocol DDC controllers so every system we commission remains fully accessible to any engineer after handover.
The dominant protocol for building automation. Supported by all major BMS platforms. Standard for healthcare, commercial, and public sector applications.
Widely used in industrial and simpler building applications. Compatible with energy meters, variable speed drives, and legacy BMS systems.
Prevalent in older commercial BMS installations. We retain LON compatibility where existing infrastructure requires it.
Our services
AHU Controller
Solutions
Save money with expert AHU controls upgrades, refurbishments, and independent commissioning.
AHU Control Fault-Finding & Diagnostics
Diagnosis of sensor, wiring, programming, and communication faults with fast resolution.
AHU Control Upgrades & Replacements
Replacement of outdated control systems with modern, efficient alternatives.
PCB Upgrades & Replacements
Supply and installation of replacement PCBs to restore full control functionality.
Trend, Tridium & BMS Integration
Integration of AHU controls within Trend, Tridium/Niagara, and other BMS platforms. We can work with existing systems or migrate to a new platform.
AHU Controller Refurbishment
Repair and upgrade of existing control systems to extend operational life.
Control Sequence Optimisation
Review and optimisation of control sequences to improve system performance and reduce unnecessary energy use.
What you get
The Controls Upgrade
Advantage
15–30%
Typical AHU energy reduction
Through improved sequences, demand-controlled ventilation, and setpoint optimisation
22%
Achieved: 14-site FM programme
Measured post-commissioning energy reduction versus pre-upgrade baseline across a commercial estate
100%
BMS integration where required
Open-protocol controllers installed as standard, compatible with all major BMS platforms
Open protocol DDC
BACnet, Modbus, or LON as standard with no proprietary lock-in.
Energy modelled upfront
Energy savings modelled before commitment so impact is known in advance.
Single unit to estate
Consistent process and delivery across one site or multi-site estates.
ESOS documentation
Energy and compliance documentation provided to support ESOS reporting.
How it works
Initial Visit to
Reinstated Full System Operations
Initial Visit
We survey the existing controls installation, hardware condition, sequence of operation, and BMS integration, and identify what an upgrade would achieve.
- Existing controller, sensors, and actuators reviewed
- Sequence of operation reviewed against current requirements
- Upgrade options and likely outcomes confirmed
Specification & Panel Build
A controls specification is produced and agreed, new panels are built and tested off-site, and a works programme is agreed before installation begins on site.
- Full controls specification issued for approval
- Panels built, wired, and factory-tested before delivery
- Works programme agreed around site occupation
Installation & Wiring
Existing controls are removed and new panels, sensors, actuators, and field wiring installed and tested to specification.
- Old controls removed, new panel installed and connected
- Sensors, actuators, and field devices wired and labelled
- Electrical certification and containment completed
Commissioning & Handover
Sequences are loaded, tested, and tuned. BMS integration confirmed and full handover documentation issued.
- Control sequences tested against approved specification
- BMS integration confirmed and I/O verified
- O&M manuals and full handover documentation issued
Our Projects
Work We've Delivered
Controller upgrades that kept existing AHUs running when replacement had been recommended.
Leisure · Ringwood
Controller Upgrade: £100k AHU Replacement Avoided
Relevant if: You've been advised to replace AHUs that appear structurally sound, Controls are failing but the mechanical structure of the unit is in good condition, You want an independent assessment before committing to capital expenditure
Leisure · Ringwood
Controller Upgrade: £100k AHU Replacement Avoided
Relevant if your project involves:
- You've been advised to replace AHUs that appear structurally sound
- Controls are failing but the mechanical structure of the unit is in good condition
- You want an independent assessment before committing to capital expenditure
External consultants recommended full replacement at over £100k. Root cause was failing controls. Two Trend controllers installed. Both units now fully operational at a fraction of the cost.
Retail · Westfield, London
AHU Controller Upgrade, Westfield Retail Store
Relevant if: AHU controls are obsolete or have failed and the system has stopped working, You need automated scheduling aligned to your trading or operating hours, Temperature control across the occupied space is unreliable
Retail · Westfield, London
AHU Controller Upgrade, Westfield Retail Store
Relevant if your project involves:
- AHU controls are obsolete or have failed and the system has stopped working
- You need automated scheduling aligned to your trading or operating hours
- Temperature control across the occupied space is unreliable
Failed fan motor and obsolete controls replaced with a Trend BMS controller and new temperature sensor. Automated scheduling, accurate climate control, and manual override restored.
Get in touch
Discuss Your
Controls Requirements
Tell us about the AHU, the existing controls hardware, and what you are trying to achieve. We will confirm BMS integration capability and upgrade options before you commit to works.
- Open-protocol DDC as standard, no proprietary lock-in
- Works with Trend, Tridium/Niagara, and all major BMS platforms
- Single units and multi-site estate programmes both handled
- No obligation to proceed
Call us directly
01256 518170Enquiry
Tell us the AHU make, current controls hardware if known, and what you are trying to achieve. We'll respond within 24 hours.
Common questions
Frequently Asked Questions
Yes. Our control solutions are designed to integrate with AHUs from any manufacturer. Because we operate independently, we can work across multiple brands and tailor the setup to suit your specific system.
Manufacturers often only supply controllers if they also carry out the installation, which limits flexibility and increases costs. We provide a fully independent service: freedom of choice, reduced downtime, and cost-effective solutions without being tied to one supplier.
Absolutely. We specialise in upgrading and replacing obsolete or faulty controllers with modern alternatives that improve efficiency, reliability, and ease of use.
Yes. We work with Trend, Tridium/Niagara, and other major BMS platforms. We can integrate new AHU controls into an existing BMS or migrate from one platform to another where required.
Typically 15–30% reduction in AHU energy consumption through improved sequences, demand-controlled ventilation, and optimised setpoints. The actual saving depends on the existing controls state. We model this at assessment stage.
Yes, and this is often the most cost-effective approach. A controls upgrade can extend the useful life of the AHU, improve energy performance, and add BMS integration without the cost of full plant replacement.