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Volume I
The Heat Files
The off-grid heating protocols — your energy foundation.
Sun, earth & wood heat — with 8 worked payback calculationsAny climate zone
Backed by a 7-day money-back guarantee
What's included
18 chapters: passive solar, thermal mass, earth tubes & clean wood heat
The Payback Files — 8 worked calculations & a 10-year case study in real dollars
An honest "solid vs. sketchy" verdict on every method
The Heat Files worksheet to run your own house's numbers
A look inside
- Digital PDF — read on any phone, tablet, or computer
- Instant download by email — no waiting, no app to install
- Covered by a 7-day money-back guarantee
Want the complete library?
Get All 6 Books — $194 $155Get all 6 books — the entire Passive House Files archive and the entire Future Files series.