‍

For Excool Special Products, designing and manufacturing AHUs for healthcare environments is a core part of what we do. With over four decades of HVAC engineering experience, we understand the precision and reliability that clinical settings demand. 

The UK's NationalHealth Service is in the early stages of its most ambitious capital investment programme in a generation. NHS health capital spending reached a record £13.6 billion in2025–26, underpinned by a long-term commitment to transform ageing hospital infrastructure across England. The New Hospital Programme is backed by more than £15 billion ofnew investment, structured across consecutive five-year construction waves running through to 2039. Looking further ahead, at least £64 billion has been committed over the next decade to maintaining the NHS estate. 

At an Integrated Care Board level, £1.67 billion in confirmed infrastructure capital has been allocated across 32 ICBs for 2025–26 alone, covering estates modernisation, new facilities, and community health infrastructure. Sixteen hospital projects are scheduled to begin construction between 2025 and 2030 under Wave 1 of the New Hospital Programme, eleven ofwhich will be delivered using the standardised Hospital 2.0 model, a modernmethods of construction approach designed to accelerate delivery and improveconsistency across schemes. Waves 2 and 3 continue through to 2039, providing asustained long-term pipeline of major healthcare construction across England.

Equally significant is the commitment to the existing estate. Lord Darzi's independent review identified a £37 billionunderinvestment in NHS infrastructure over the preceding decade, leaving alegacy of ageing plant rooms, failing building fabric and ventilation systems that no longer meet modern clinical standards. Over £1 billion has been ring-fenced for critical maintenanceand upgrades, this work will require engineering solutions capable of meeting current regulatory requirements. 

Every new build hospital and every refurbished ward require a compliant, high-performanceventilation strategy. In clinical settings, the air handling infrastructure must be right from the outset. 

Healthcare AHUs are fundamentally different in scope and specification from systems designed for commercial or industrial applications. Hospitals require continuous, uninterrupted operation across a range of zones.  An operating theatredemands a controlled, positively pressured clean air environment; an isolation room for infectious patients requires the opposite. Pharmacies, sterileservices units and critical care facilities each carry their own specifications.

High efficiency filtration, including HEPA where required ensure hygienic internal constructionand precise airflow management are essential characteristics of any AHU deployed in a clinical setting. Systems must be engineered to prevent cross-contamination between zones, support infection control strategies andsustain performance under continuous operational demands. A standard commercial AHU cannot meet these requirements and the consequences of specifying in adequate equipment in a healthcare context are significant.

‍

HTM-03compliance as a baseline requirement

In the UnitedKingdom, all ventilation systems installed within NHS and private healthcare facilities must comply with Health Technical Memorandum 03; HTM-03.  Theyset out binding requirements for system design, installation, commissioning andmaintenance, defining the minimum acceptable standards for healthcare ventilation across a wide range of clinical environments.

Compliance with HTM-03 covers airflow rates and pressure relationships, hygienic design of AHUcomponents, filter specifications and the maintenance protocols required tosustain performance over time. For contractors and consultants specifying ventilation equipment, HTM-03 compliance is a prerequisite. 

Excool Special Products designs and manufactures AHUs built to HTM-03 requirements,ensuring that compliance is an intrinsic property of the equipment rather than something that must be retrofitted or demonstrated retrospectively.

‍

Energy performance and the net zero agenda

The NHS has committed to reaching net zero across its direct emissions by 2040. Building services, including HVAC represent a material proportion of NHS carbon output and new build hospital projects under Hospital 2.0 are expected to meet high energy performance benchmarks. Across the existing estate, retrofit programmes increasingly include the replacement of ageing, energy-intensive ventilationplant with modern, low-carbon alternatives.

Specifiers are therefore seeking systems that combine clinical performance with measurable efficiency gains. Heat recovery, variable speed drives and intelligent controls are now standard elements of any credible healthcare AHU specification. The expectation is that energy performance and clinical compliance are delivered together. 

At Excool SpecialProducts, we engineer healthcare ventilation systems that meet bothrequirements. Our air handling units are designed for continuous clinical operation, built to HTM-03standards, and configured to support the long-term sustainability commitments that NHS projects now demand.

With a hospital-building and refurbishment programme of this scale now under way, the infrastructure decisions being made today will define the clinical environmentsof the next several decades. Ventilation is at the heart of those decisions.

To discuss a healthcare project or find out more about our HTM-03 compliant air handling units, get in touch with the Excool Special Products team via info@excoolsp.com