Cool Your House Without AC: Free Air Conditioning for Life with Geothermal Cooling Earth Tubes (Earth-Air Heat Exchangers)

Your air conditioner costs thousands of dollars, burns electricity all summer, and will need replacing in fifteen years. The earth under your feet costs nothing - and it stays cool year-round.Earth tubes - also known as earth-air heat exchangers or geothermal cooling tubes - are one of the oldest passive cooling technologies on the planet, used in some form since ancient Persia, and one of the least known among modern homeowners and builders. A length of buried PVC pipe, a gravel bed, and a cracked window are all it takes to deliver free air conditioning for the lifetime of your home - passively, silently, and at zero operating cost.This is the most comprehensive DIY guide to earth-air heat exchanger design and installation ever written for the existing homeowner, new home builder, homesteader, and off-grid community. It covers everything from the physics of geothermal cooling to the hands-on trench work, from ancient Persian qanats to the latest research on backfill materials and corrugated pipe performance.Inside you will find: - A complete honest pros and cons assessment - including when earth tubes are NOT the right choice for your site- Step-by-step installation from trench planning to interior finishing- The Larry Larson slit-and-sand method - the highest-performing DIY earth-air heat exchanger design documented- Two original designs: angled tubes for condensate water collection, and spiral tubes for small lots and bermed homes- How to size your system for humid climates, high water tables, and off-grid communities- What goes wrong - and how to spot it before it becomes a permanent problem- Every other low-cost cooling method worth knowing about, and why earth tubes outperform most of them- Community-scale geothermal cooling for ecovillages and intentional communities, with documented case studies and real performance data- How earth tubes pair with passive solar design, rocket mass heaters, and thermal mass constructionThe book also covers the history you did not learn in school: 3,000-year-old Persian qanats that cooled entire desert cities without electricity, the termite mounds that inspired a net-zero office building in Zimbabwe, and the prairie dog burrow that applies Bernoulli's principle more elegantly than most HVAC engineers.Whether you are building new, retrofitting an existing home, living off-grid, or designing housing for a community, this guide gives you everything you need to put the earth's stable temperature to work - permanently, passively, and for the cost of a weekend's worth of pipe and a rented trencher.Cool your house without AC. No electricity required. For life.