A well-structured maintenance contract keeps your air handling units running efficiently, extends equipment life, and prevents the kind of unexpected breakdowns that disrupt buildings and budgets. But not all contracts are created equal — and understanding what should be included helps you compare options and avoid gaps.
We manage AHU maintenance contracts across commercial and industrial sites throughout the UK. Here’s what we include in ours, and what you should expect from any credible maintenance provider.
What a Standard Maintenance Contract Covers
At minimum, a planned preventive maintenance (PPM) contract should include scheduled visits at agreed intervals — typically quarterly for most commercial installations, with additional visits for critical or continuously operating equipment.
Each visit should cover a defined scope of work appropriate to the visit frequency. We structure ours around daily/weekly checks (carried out by on-site facilities teams with our guidance), quarterly inspections covering filters, belts, dampers, and drain pans, six-monthly services addressing bearings, coils, and safety devices, and annual comprehensive assessments including performance testing and trend analysis.
This structured approach is based on decades of hands-on experience. When we assessed the four AHUs at Dalston Cross, the deterioration we found — failed damper actuators, degraded bearings, and poor heat recovery performance — was exactly the kind of progressive decline that regular maintenance catches and prevents.
Planned vs Reactive Maintenance
The best contracts balance planned maintenance with reactive response capability.
Planned maintenance follows a schedule and addresses components before they fail. Filter changes, belt replacements, and bearing lubrication happen at defined intervals regardless of whether problems are apparent. This prevents the majority of breakdowns and maintains energy efficiency.
Reactive maintenance covers unplanned breakdowns. Even well-maintained equipment occasionally fails, and your contract should define response times for emergency callouts. We typically offer response within 4 working hours for critical systems and next business day for non-critical equipment.
A contract that’s purely reactive — waiting for things to break before fixing them — will always cost more in the long run. Emergency callouts carry premium charges, parts need to be sourced urgently, and the equipment damage from running to failure is always worse than preventive intervention.
What Should Be Included in the Price
Clarity on inclusions avoids disputes later. Our contracts clearly specify what’s covered and what’s charged additionally.
Typically included: labour for scheduled visits, standard consumables (filters, belts, lubricants), travel, basic diagnostic equipment, written reports after each visit, 24/7 emergency helpline access.
Typically additional: major component replacement (motors, coils, actuators), refrigerant, specialist parts, out-of-hours emergency callout labour, modification or upgrade work.
Some providers offer “fully comprehensive” contracts that include all parts and labour — including major components. These carry a higher annual cost but provide budget certainty. Others offer “labour only” contracts where all parts are charged separately. The right model depends on equipment age, condition, and your organisation’s preference for budget predictability versus lower base cost.
What to Look For in a Provider
Experience with your specific equipment matters. AHUs vary enormously in design, manufacturer, and application — a provider familiar with your type of installation will diagnose problems faster, source parts more efficiently, and maintain systems more effectively.
Look for providers who can demonstrate experience across similar applications. Our project portfolio shows the range of environments we work in — from office blocks and retail complexes to airports and 24-hour processing facilities.
Ask about reporting. Good maintenance providers deliver written reports after every visit, documenting what was done, what was found, and what needs attention. These reports build a maintenance history that supports asset management decisions. If a provider can’t tell you what they did on the last visit, they probably didn’t do much.
Matching the Contract to Your Equipment
New equipment needs less intensive maintenance than ageing systems, but still needs regular attention to maintain warranty compliance and catch early issues.
Older equipment often benefits from enhanced maintenance programmes — more frequent visits, additional monitoring, and proactive component replacement before failure. The maintenance cost is higher, but it’s still significantly less than premature replacement.
Critical equipment — serving operating theatres, clean rooms, data centres, or 24-hour facilities — justifies premium contracts with faster response times and enhanced monitoring.
We tailor every maintenance contract to the specific equipment, application, and client requirements. There’s no point paying for quarterly visits to a unit that runs 12 weeks a year, and there’s no point skimping on maintenance for a system that runs 24/7.
Energy Monitoring as Part of Maintenance
Modern maintenance contracts increasingly include energy monitoring as standard. Tracking energy consumption over time identifies efficiency degradation before it becomes significant.
We include energy performance baseline measurement in our annual assessments. Comparing year-on-year consumption — normalised for weather and occupancy — reveals whether systems are maintaining efficiency or gradually declining. This data also supports the case for energy saving upgrades when the numbers justify investment.
How We Can Help
i-Flow Technologies provides tailored AHU maintenance contracts through our Electroair division. From basic planned maintenance through to fully comprehensive contracts with guaranteed response times, we structure agreements around your equipment, your application, and your budget.
Contact us to discuss your maintenance requirements or arrange a survey of your existing equipment.
