Week #13: Pros and Cons of Solar Electric
Next up: Solar Photovoltaics. The first thing that everyone needs to know about solar energy is that there are two basic types of solar panels: those that provide electricity (photovoltaic panels, or PV), and those that provide heat. They are two entirely different types of panels that work in entirely different ways, with different costs and benefits. So when someone says: “I want solar,” I always clarify which kind first. (“Passive” solar is another type, but that does not involve any equipment.)
and cooling from the earth to heat and cool the home. The easiest way to think about it is a heat exchange system uses the earth’s constant 50-55 degree temperature to help you get to your desired home temperature, which is usually between 68 and 72 degrees. In the hot summer months, think about that outdoor air conditioning compressor that has to work so hard to bring in 90-100 degree air and cool it down. Instead, the ground source heat pump brings in 50 degree water to help cool the air. Another benefit is that there is no outdoor air conditioning compressor. 
