I just published my latest book, Cool Your House Without AC: Free Air Conditioning for Life with Geothermal Cooling Earth Tubes (Earth-Air Heat Exchangers), and I wanted to share why I wrote it.

A few feet below the surface, the ground stays at a nearly constant temperature year-round — cooler than the summer air, warmer than the winter air. People have known this for thousands of years. The Persians built underground qanats to cool entire desert cities long before electricity existed. Termite mounds inspired a net-zero office building in Zimbabwe. Even prairie dogs use airflow tricks that put a lot of modern HVAC design to shame.

Earth tubes — also called earth-air heat exchangers — work on the same principle. Bury a length of pipe, run air through it, and the ground does the cooling for you. No compressor, no refrigerant, no electric bill. Just dirt, pipe, and airflow.

I wrote this book because most of what’s online about earth tubes is either oversimplified (“just bury a pipe!”) or buried in dense academic papers. I wanted something in between: a complete, honest, hands-on guide for homeowners, builders, homesteaders, and off-grid communities who actually want to install one of these systems and have it work.

What’s Inside

The book walks through everything from the underlying physics to the actual trench work, including:

• An honest pros-and-cons breakdown — including the situations where earth tubes are not the right choice
• Step-by-step installation, from planning your trench to finishing the interior
• The Larry Larson slit-and-sand method, one of the best-documented high-performance DIY designs out there
• Two original designs I developed: angled tubes for condensate drainage, and spiral tubes for tight lots or bermed homes
• Sizing guidance for humid climates, high water tables, and off-grid setups
• Common failure points — and how to catch them before they become permanent problems
• How earth tubes compare to other passive cooling methods
• Community-scale systems for ecovillages, with real case studies and performance data
• How earth tubes pair with passive solar design, rocket mass heaters, and thermal mass construction

Who It’s For

If you’re building new, retrofitting an existing home, living off-grid, or planning housing for a community, this book gives you what you need to put the earth’s stable temperature to work — permanently and passively, for roughly the cost of a weekend’s worth of pipe and a rented trencher.

Cool Your House Without AC is the first book in my Resilient Homestead Villages series, and it’s available now in paperback on Amazon (USA) or Amazon (Canada).

If you’ve ever wondered whether you could ditch your AC unit for good, this is the book that shows you how.

~ Meadow Cern