Heat Pump Evolution — 40 Years of Innovation

• Chapter 1 — France after the Oil Crises: an Energy Emergency

  The energy context of the 1980s, the PERCHE programme and its failures.

• Chapter 2 — Yves Lenoir & Professor Suominen: a different way of thinking about heat pumps

  The Finnish paradox: why their heat pumps worked where ours failed.

• Chapter 3 — Suominen's Four Principles: from intuition to global standard

  From the intuitions of the 1980s to today's global standard.

• Chapter 4 — Forty Years Later: what has changed, what remains

  What has changed, what remains — and what Lenoir understood before the others.

• Chapter 5 — Understanding Modern Heat Pumps

  Refrigeration cycle, Inverter compressor, controls, refrigerants.

• Chapter 6 — Diagnosing and Troubleshooting Modern Heat Pumps

  What a Papy Maker can do — safely.