If you are looking for something energy efficient and cost effective in Indian Springs, a 20 SEER heat pump might just be your best bet. Its SEER rating, despite being the lowest in this selection, still indicates a high level of efficiency if you size the heat pump correctly. As previously mentioned, heat pumps work well in our climate, and use far less energy than a typical gas furnace or electric power plant. A 20 SEER heat pump, then, does what a heat pump does, and does it mostly for less. If you can find it, and if you can afford it, and if you can make work in a way that satisfies gas and/or electric utility contracts, then you're probably looking at a good purchase and not a bad climate future, at least on the scale of things you might do personally for those couple of decades.