The direction of travel for commercial HVAC is clear: off fossil fuels, onto electricity, and towards net zero. For building owners, that’s not just an environmental question — it’s increasingly a commercial and regulatory one, as energy standards tighten and poorly performing buildings become harder to let and insure. The air handling unit sits right in the middle of that shift. Here’s what’s changing and what’s worth planning for.
Off gas, onto electricity
Traditionally, the heat delivered by an air handler often came from a gas boiler. Decarbonisation means moving away from that — and the leading replacement is the heat pump. A heat pump moves heat rather than burning fuel to create it, running on electricity that’s getting cleaner every year as the grid decarbonises. Paired with an air handling unit, a heat pump can supply the heating (and often the cooling) that the unit then delivers to the building.
Electrification can also mean swapping gas-fired heating for electric heating coils within the air handler itself, depending on the building and its supply.
Squeezing more from what you’ve got
Decarbonisation isn’t only about ripping out and replacing. A huge amount of carbon is wasted simply through inefficiency — units running harder than they need to, heat thrown away on the exhaust. That’s why heat recovery, efficient EC fans and good controls are such an important part of any low-carbon strategy: they cut the energy demand before you even change the heat source. Often the smartest first step is to make the existing system as efficient as possible.
Refurbish or replace for net zero?
A common question is whether decarbonising means a full replacement. Frequently it doesn’t. An existing air handler in good condition can sometimes be refurbished and re-coupled to a low-carbon heat source, which is far less disruptive and wasteful than wholesale replacement. Other times, an older unit is the bottleneck and replacement is the cleaner long-term answer. The right call comes from assessing the actual plant, not from a blanket assumption.
On an energy-intensive industrial site like our work for an aerospace manufacturer in Derby, the gains came from treating the air handling and its energy source as one system — efficiency first, then the right heat source — rather than chasing a single silver bullet.
Planning ahead
Even if net zero feels a way off for your building, the decisions you make at the next maintenance, refurbishment or replacement point will either lock you into the old way or open the door to the new one. Building it into your plant strategy now is far cheaper than retrofitting in a panic later.
We help building owners plan and deliver lower-carbon air handling — from efficiency upgrades to heat-pump-ready systems. If decarbonisation is on your horizon, get in touch and we’ll help you map a sensible path.
