Affordable Solar & Wind

How hard and expensive is it to install solar panels on a house that is already built?

I live in central Texas. I want to install some solar panels on the roof of my house for electricity. Im just not sure how expensive it will be or if it even makes sense to do. My house is one story 2100 square feet.

More or less depends on things like orientation of the house, roof pitch, shade, etc. Here are the folks you probably want to start with:

http://www.seco.cpa.state.tx.us/re_solar.htm

and

http://www.infinitepower.org/calculators.htm

How to Install Solar Panels : Wiring for Solar Panels

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Solar Panels of the International Space Station Backdropped by a Blue and White Earth $124.99 Stocktrek Images Solar Panels of the International Space Station Backdropped by a Blue and White Earth - Wall Mural

International Space Station's Solar Array Panels and Earth's Horizon $24.99 Stocktrek Images International Space Station's Solar Array Panels and Earth's Horizon - Photographic Print