Why do it:

Upgrading or optimising ventilation systems improves indoor air quality, reduces energy waste, and enhances occupant comfort and productivity. Modern demand-controlled ventilation (DCV) and heat recovery systems ensure fresh air is delivered efficiently, cutting unnecessary fan energy use.

Typical Savings:

• Efficient fans & controls: 20–30% reduction in ventilation energy use.

• Demand-controlled ventilation (CO₂/occupancy sensors): 15–25% savings by matching airflow to actual need.

• Heat recovery ventilation (HRV/ERV): 40–70% savings on heating/cooling loads by reclaiming exhaust energy.

• Example: A site spending £100,000 annually on HVAC could save £20,000–£40,000 per year.

Typical Costs:

• Rule of thumb: £300-£800 per kW (Motor)

• Efficient fans (EC motors, VSDs): £500–£2,000 per unit depending on size.

• Sensors (CO₂, occupancy, humidity): £100–£300 each.

• Heat recovery units: £2,000–£10,000 depending on capacity.

• Installation & commissioning: £5,000–£20,000 for a medium site.

• Ongoing costs: £500–£2,000 per year (filter replacement, calibration, maintenance).