Do not be discouraged at the cost of starting solar energy. You may find it pricy to get the products you need for setting up a solar energy system. But, you will find a much cheaper electric bill every month, paying off the initial start up cost and then some.
A solar powered fan for your attic is a good choice if switching completely to solar power is not feasible. The fan will have a temperature sensitive gauge and switch itself on when necessary. This will remove heat and lower the cost of cooling. It's also solar powered, so you don't have to pay to power it.
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When you think of solar energy, you probably think of huge panels on the roof of your house. You have more options if there is some space on your property. If they are fitted with trackers that follow the sun, and special mounts, they can more efficiently capture the sun's rays throughout the day. Still, it will take a little bit of room.