Energy Academy
Maintenance & Heat Recovery11 / 13

Common Improvement Projects

Speed controllers (VFD), variable-displacement compressors, audits.

9 min read · Jacob Willis, Net Zero Lead · Last reviewed July 2026


Compressed air rewards a programme more than any single project. The measures in this course interact: fixing leaks lets the pressure come down, lower pressure shrinks the remaining leaks, better control converts both into electricity not drawn, and metering proves the lot. This closing lesson assembles the course into a sequenced improvement plan, with the numbers from earlier lessons gathered in one place for a reference 90 kW system spending about £108,000 a year.

In this lesson

  • 01Sequence the work so each step funds the next
  • 02Keep it saved
  • 03Sources and further reading