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…