Every ageing air handling unit reaches a crossroads. Performance drops, energy bills climb, and maintenance becomes more frequent. The question isn’t whether to act, but how: full replacement or refurbishment?
Both options have merit. The right choice depends on the condition of your existing unit, your building’s requirements, budget constraints, and long-term plans.
When Refurbishment Makes Sense
Refurbishment works well when the fundamental structure remains sound. If the casing is solid, the frame isn’t corroded, and the unit’s footprint suits your needs, upgrading components can deliver excellent results at lower cost than replacement.
Good candidates for refurbishment:
Units where the casing and frame are structurally sound but internal components have worn. Fan motors, bearings, coils, and dampers can all be replaced while retaining the existing structure.
Systems where the original specification still matches requirements. If the airflow rates, heating and cooling capacity still suit the building, refurbishment makes sense.
Situations where access constraints make replacement difficult. Some plant rooms weren’t designed for equipment removal. If getting a new unit in would require structural work, refurbishment becomes more attractive.
Buildings where minimal disruption is critical. Refurbishment can often be staged, maintaining partial operation throughout. Replacement typically means extended downtime.
What refurbishment typically includes:
New fan assemblies with modern EC motors deliver immediate energy savings. Coil replacement improves heat transfer efficiency. New dampers and actuators restore proper air control. Fresh filters and upgraded filtration improve air quality. Controls upgrades enable better monitoring and optimisation.
When Replacement is the Better Option
Sometimes refurbishment just delays the inevitable. Replacement makes more sense when fundamental issues exist or when requirements have changed significantly.
Indicators that replacement is needed:
Severe corrosion to the casing or frame. Once structural integrity is compromised, refurbishment becomes a temporary fix. You’ll be replacing it within a few years anyway.
Significant changes in building use. If cooling loads have increased, occupancy has changed, or air quality requirements have tightened, the existing unit may simply be wrong for current needs.
Obsolete designs that can’t meet modern standards. Older units often can’t accommodate heat recovery, improved filtration, or modern controls without fundamental redesign.
Poor energy performance that component upgrades can’t fix. Sometimes the basic design is inefficient. Modern units are simply better.
Benefits of replacement:
Current efficiency standards mean significantly lower running costs. Modern units incorporate design improvements developed over decades. Proper sizing ensures the unit matches actual requirements. Full warranty coverage provides peace of mind. Latest controls integration enables smart building connectivity.
Comparing Costs
Refurbishment typically costs 40-60% of replacement. That’s a significant saving, but it’s not the whole picture.
Consider total cost of ownership:
A refurbished unit won’t match a new unit’s efficiency. If energy savings from a new unit are substantial, payback may be quicker than expected.
Refurbished units have shorter remaining life. A new unit should last 20-25 years. A refurbished unit might manage another 10-15, depending on what’s done.
Maintenance costs differ. New units need less attention initially. Refurbished units may still have original components that fail within a few years.
The calculation:
For a unit with 10+ years of expected remaining service, replacement often makes financial sense despite higher upfront cost. For a unit approaching end-of-life in a building that may itself be redeveloped, refurbishment buys time economically.
Making the Decision
Start with a thorough survey. Any reputable contractor will assess the existing unit before recommending a course of action. This should include structural inspection, component condition assessment, and performance testing.
Define your requirements. What does the building actually need now? Has anything changed since the original installation?
Consider the bigger picture. What are your plans for the building over the next 10-20 years? Are there other HVAC upgrades planned that might influence this decision?
Get comparable quotes. Ask for both options to be priced. Some contractors push replacement because it’s more profitable. Others default to refurbishment because it’s less complex. Get genuine alternatives to compare.
Our Approach
i-Flow offers both refurbishment and replacement services. We’ll survey your existing unit, assess its condition honestly, understand your requirements, and recommend the option that genuinely makes most sense for your situation.
Sometimes that’s refurbishment. Sometimes it’s replacement. Sometimes it’s a phased approach. We’ll explain the reasoning and let you decide.
Contact us to arrange a survey and discuss your options.
