It's pretty curious that they would put up solar panels for electricity, but not use solar water heat for heat. Solar water heat is the cheapest way to add solar energy solutions to a house. From what I've read, you can pay off a system in as little as 2 years or so.
Especially when they are just using radiant floor heating anyway. For the cost of running a gas line, they could probably have purchased most of the solar collectors required.
Perhaps the technology wasn't as advanced 10 years ago? I don't know.
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