Heating and ventilation are among the most important building services for organisations seeking to reduce energy consumption, control operating costs and improve workplace conditions. But selecting the right equipment involves more than comparing boiler efficiencies, heat pump specifications or ventilation airflow rates.
A highly efficient heating system may still waste energy if it serves poorly controlled zones. Equally, reducing ventilation to cut energy costs can compromise indoor air quality and create uncomfortable working conditions.
The challenge is particularly significant in existing commercial buildings, where ageing plant, changing occupancy patterns and limited visibility of system performance can make efficiency improvements more difficult.
For energy managers, the priority should be to understand how heating and ventilation work together.
The UK Government’s Energy Technology List (ETL) provides independently assessed product information covering technologies including heat pumps, HVAC controls and heat recovery ventilation.
Meanwhile, Health and Safety Executive (HSE) guidance makes clear that employers must maintain reasonable workplace temperatures and provide adequate ventilation.
Together, these considerations create a fundamental buying principle. The objective isn’t simply to use less energy. It’s to use energy more intelligently while maintaining the conditions people need.
Understand the Building Before Choosing the Equipment
Heating and ventilation requirements vary considerably between buildings.
An office with fluctuating occupancy has different requirements from a warehouse, school, hotel or healthcare facility.
Building age, insulation, glazing, operating hours and internal heat gains can all affect the amount of heating and ventilation required.
Before comparing equipment, energy managers should establish how the building currently performs.
This should include reviewing energy consumption, existing plant condition, occupancy patterns and areas where occupants report discomfort.
The Chartered Institution of Building Services Engineers (CIBSE) provides technical guidance covering heating, ventilation and environmental design, supporting a building-specific approach.
A system should be selected according to the demand it needs to meet, not simply because it offers an attractive headline efficiency rating.
Compare Heating Technologies Against Actual Demand
Commercial heating options include conventional boilers, heat pumps, direct electric systems and other specialist technologies.
Each has different installation requirements, energy characteristics and suitability for particular applications.
Heat pumps are increasingly relevant to commercial decarbonisation because they transfer heat rather than generate it directly through combustion or electrical resistance.
However, their performance depends on factors including operating temperatures, system design and how effectively heat is distributed.
The ETL includes air-source, ground-source and water-source heat pumps that meet relevant efficiency criteria.
Energy managers should compare technologies against the building’s actual heating requirements.
Existing emitters, distribution systems and insulation may influence whether a heat pump installation can operate effectively.
Where major changes are required, the associated costs should be considered alongside the efficiency of the heating equipment itself.
Evaluate Ventilation as a Separate Requirement
Heating and ventilation systems are closely connected, but they perform different functions.
Heating maintains suitable thermal conditions.
Ventilation supplies fresh air and removes stale air, moisture and certain indoor pollutants.
The HSE states that employers must ensure enclosed workplaces receive a sufficient quantity of fresh or purified air.
This requirement should not be compromised simply to reduce heating demand.
Natural ventilation may be suitable in some environments, while mechanical ventilation is often necessary where airflow needs to be controlled more consistently.
Many buildings use a combination of both.
Buyers should establish the required ventilation rates, the characteristics of the occupied spaces and whether existing systems can reliably provide adequate fresh air.
Where buildings have specialist processes or hazardous airborne substances, additional local exhaust ventilation and regulatory requirements may apply.
Consider Heat Recovery Ventilation
Ventilation can increase heating demand because incoming outdoor air often needs to be warmed during colder weather.
Heat recovery ventilation systems help reduce this energy requirement by transferring heat between outgoing and incoming airstreams.
The ETL includes eligible heat recovery ventilation technologies, such as plate and rotary heat exchangers.
For suitable buildings, these systems can reduce the amount of additional heating required while maintaining necessary ventilation.
However, buyers should examine more than the advertised heat recovery efficiency.
Fan energy, pressure losses, maintenance requirements and the suitability of the installation all affect overall performance.
Heat recovery should be evaluated as part of the building’s complete heating and ventilation strategy rather than as an isolated energy-saving component.
Compare Controls and Zoning
Even efficient heating equipment can consume unnecessary energy if it operates in areas that do not require conditioning.
Controls and zoning can help match heating and ventilation output to actual building use.
For example, meeting rooms may have intermittent occupancy, while shared working areas operate throughout the day.
A uniform operating schedule may therefore result in some spaces being heated or ventilated unnecessarily.
Building management systems (BMS), programmable controls and suitable occupancy-based strategies can help align system operation with demand.
However, demand-controlled ventilation must still maintain appropriate indoor air quality and meet the requirements of the space.
Energy managers should establish whether proposed controls support separate zones, appropriate operating schedules and straightforward adjustment.
The aim should be to reduce unnecessary operation without creating unstable temperatures or inadequate ventilation.
Assess Indoor Air Quality and Comfort
Energy efficiency cannot be evaluated independently of the conditions experienced by building occupants.
The HSE identifies several factors affecting thermal comfort, including air temperature, radiant temperature, air movement, humidity, clothing and activity levels.
Temperature alone therefore provides an incomplete picture of whether a workplace is comfortable.
Similarly, indoor air quality depends on appropriate ventilation and the sources of pollution within a space.
Energy managers should consider how proposed systems will maintain suitable conditions throughout normal building operation.
This may involve assessing airflow distribution, temperature variation, draughts and the location of occupied areas.
A system that performs efficiently under laboratory conditions may deliver disappointing results if its design creates uncomfortable spaces that occupants attempt to compensate for through portable heaters or open windows.
Review Energy Performance in Real Conditions
Manufacturers may provide useful efficiency ratings, but energy managers should understand the conditions under which those figures were established.
A heat pump’s seasonal performance, for example, can differ from its performance at a particular test point.
Ventilation equipment must also be evaluated according to fan energy, airflow requirements and any additional energy associated with heat recovery.
The ETL provides a useful source of product-specific efficiency criteria and independently assessed information.
However, comparing individual products is only part of the procurement process.
Buyers should ask suppliers to explain expected system performance in their particular building, including assumptions about occupancy, operating hours and heating demand.
Where possible, projected savings should be supported by appropriate calculations and a clear measurement methodology.
Calculate Whole-Life Cost
Initial purchase and installation costs are important, but they do not show the full financial implications of a heating and ventilation investment.
Whole-life cost should consider energy expenditure, maintenance, repairs, expected equipment life and any additional infrastructure required.
For example, a lower-cost ventilation unit may consume more fan energy or require more frequent maintenance than an alternative.
Likewise, replacing a heating system may involve modifications to electrical infrastructure, heat distribution or controls.
Energy managers should also consider potential disruption during installation.
The most appropriate system is not necessarily the cheapest to buy or the one promising the largest theoretical energy saving.
It is the solution that delivers suitable building performance at a sustainable total cost.
Examine Installation and Building Constraints
Commercial heating and ventilation projects can involve significant practical challenges.
Plant-room space, roof access, electrical capacity, ductwork routes and the condition of existing distribution systems can all influence the available options.
A proposed system may be technically efficient but difficult or expensive to install within the existing building.
Energy managers should therefore involve suitably qualified designers and installers before committing to equipment.
For occupied buildings, the installation plan should also explain how services will be maintained and disruption minimised.
Larger projects may benefit from phased works or temporary arrangements.
A realistic installation assessment can prevent the procurement process from favouring equipment that is unsuitable for the available infrastructure.
Consider Maintenance and Reliability
Heating and ventilation systems need appropriate maintenance to continue operating effectively.
Poorly maintained filters, fans, controls and heat exchangers can affect efficiency and system performance.
Buyers should establish the manufacturer’s maintenance requirements, the availability of replacement components and the accessibility of equipment for inspection and servicing.
The CIBSE Guide M covers maintenance engineering and management, providing a useful reference for considering ongoing operational responsibilities.
Energy managers should also ask whether suppliers offer maintenance support, remote monitoring or performance reviews.
A system that delivers excellent results immediately after commissioning may become less efficient if its performance is not maintained.
Reliability and ease of servicing should therefore form part of the original buying decision.
Plan for Decarbonisation and Future Requirements
Heating investment decisions can have consequences for many years. Organisations should consider how equipment choices align with their longer-term energy and carbon reduction objectives.
Moving from fossil-fuel heating to electrically powered heat pumps may support building decarbonisation, although the financial and emissions outcomes depend on system performance, electricity supply and the existing heating arrangement.
Changes in occupancy, building use and future refurbishment plans may also affect equipment requirements.
Energy managers should examine whether proposed systems can accommodate foreseeable changes without substantial additional investment.
Where immediate replacement is not practical, improvements to controls, maintenance and heat distribution may provide useful interim benefits.
A staged strategy can help organisations avoid unnecessary spending while preparing for more substantial changes.
Check Compliance and Relevant Standards
Commercial heating and ventilation projects may be subject to building regulations, workplace requirements and other obligations depending on the installation and building type.
For non-domestic rented buildings in England and Wales, Minimum Energy Efficiency Standards generally require an EPC rating of at least E unless a valid exemption applies.
Heating and ventilation improvements may contribute to wider energy performance strategies, but a system replacement does not automatically guarantee a particular EPC rating.
Energy managers should also establish whether specialist requirements apply to ventilation, refrigerants, combustion equipment or other building services.
Relevant CIBSE guidance and competent professional advice can help buyers assess technical and regulatory requirements.
Compliance should be considered at the specification stage rather than immediately before installation.
Make Commissioning Part of the Specification
An efficient heating and ventilation system can underperform if it is not correctly commissioned.
Equipment may have inappropriate operating schedules, poorly balanced airflow or incorrect control settings.
Buyers should therefore confirm how performance will be tested before handover.
Commissioning requirements should cover relevant heating and ventilation functions, control sequences, operating conditions and any necessary balancing.
Building operators should receive suitable documentation and training.
The project should also establish responsibility for addressing faults identified during the initial operating period.
Commissioning is not simply confirmation that the equipment turns on.
It is the process of establishing that the system performs as intended within the building.
Questions to Ask Heating and Ventilation Suppliers
When comparing commercial heating and ventilation solutions, energy managers should consider:
- How has the building’s heating and ventilation demand been assessed?
- Which technologies are most appropriate for the application?
- What assumptions support the predicted energy savings?
- How will adequate ventilation and indoor air quality be maintained?
- Is heat recovery suitable for the building?
- Can heating and ventilation operate according to occupancy and demand?
- What zoning and control capabilities are available?
- How will the solution integrate with existing building systems?
- What infrastructure or distribution changes are required?
- What are the expected operating and maintenance costs?
- How does the proposed equipment support decarbonisation objectives?
- Which standards and regulatory requirements apply?
- How will the system be commissioned and tested?
- What training and documentation will be provided?
- How will performance be monitored after installation?
Frequently Asked Questions
What is the difference between heating and ventilation?
Heating maintains suitable indoor temperatures, while ventilation supplies fresh air and removes stale air and certain pollutants. They are separate functions but must be coordinated to achieve good building performance.
What is the most energy-efficient commercial heating system?
There is no single best option for every building. Efficiency depends on heating demand, system design, operating temperatures, energy sources and the suitability of the technology for the application.
Can heat recovery ventilation reduce energy costs?
Heat recovery ventilation can reduce the amount of energy required to heat incoming fresh air. The overall benefit depends on system design, airflow, fan energy, operating conditions and maintenance.
How can businesses improve HVAC efficiency?
Potential measures include better controls, zoning, maintenance, heat recovery, improved commissioning and replacing inefficient equipment where justified by building requirements.
Should heating and ventilation be upgraded together?
Not necessarily, but both should be assessed as part of a coordinated building strategy. Changes to one system may affect the performance and energy requirements of the other.
Product & Services Guide
The Energy Management Summit brings together senior energy, sustainability, estates and facilities decision-makers with relevant solution providers through pre-arranged one-to-one meetings, offering an opportunity to explore heating and ventilation, building controls, energy efficiency and wider decarbonisation solutions.
Make Heating and Ventilation Work Together
Commercial heating and ventilation decisions should not be based solely on equipment efficiency ratings or initial installation costs.
Energy managers need to understand how the systems interact, whether they support the building’s actual requirements and how performance will be maintained over time.
A useful buying framework is: assess → specify → integrate → control → verify
Assess the building’s heating and ventilation needs.
Specify equipment suited to those requirements.
Integrate heating, ventilation and building controls.
Control operation according to demand.
Then verify that the completed system delivers the expected results.
The most efficient heating and ventilation system isn’t simply the one that uses the least energy.
It’s the one that delivers the right conditions, in the right spaces, at the right time, with the least unnecessary energy.
The Energy Management Summit brings together senior energy, sustainability, estates and facilities decision-makers with relevant solution providers through pre-arranged one-to-one meetings, offering an opportunity to explore heating and ventilation, building controls, energy efficiency and wider decarbonisation solutions.
Related Reading
This is the first article in our November Heating & Ventilation series.
It provides a buyer’s guide to comparing commercial heating and ventilation technologies, including efficiency, indoor air quality, system integration, installation, controls and whole-life cost.
The next article will examine how organisations can optimise the performance of existing heating and ventilation systems, identifying opportunities to reduce energy waste without compromising comfort or air quality.
Sources
- HSE – Ventilation in the Workplace
- HSE – Managing Workplace Temperatures
- HSE – Thermal Comfort
- UK Government – Energy Technology List
- CIBSE – Heating, Ventilation, Air Conditioning and Refrigeration Guides
- CIBSE – Technical Memoranda
- GOV.UK – Non-domestic Minimum Energy Efficiency Standards
Image credit: https://unsplash.com/photos/a-tall-white-building-sitting-under-a-blue-sky-9AoXmg7PnQI
