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I've been researching underground homes for many years and hope to build one in about 10 years.

The main benefits are a stable temperture underground, approx 55 degrees here in VA. We have stable soil for the construction. In an conventional home when the temp outside is 0, the inside will become close to 0. You have to expend energy to get the inside temp to 70 and keep it there.

In an underground home the ground temp is 55, you just have to raise the temp 15 degrees to obtain the 70 degree mark. Plus the earth insulation makes it easy to retain the heat.

The main problems are interior sweating, where condensation forms on the walls and mold will commence. With good construction, exterior waterproofing, good inside insulation and proper ventilation, an underground home is efficient and less prone to natural disasters. HVAC costs are way reduced.

It may cost more to build, but the reduced maintenance costs will provide an eventual payback.

Just think of it as a basement with no upstairs (Mancave).
 

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Easy way to take care of the condensation when constructing is a small drain field & hook up a dehumidifier to it. Or just attach it to your gray water drainage.
Fla and Va are very different.
 
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