You will have to pay around five thousand dollars for the solar heating system that you choose. Think how fast you'll make that money back by all of your savings from a lowered power bill. Solar panels can be installed gradually.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.
Solar heating of swimming pools makes sense.
It is always best to install your solar panels where they will get the most sunlight each day. It is important to check regularly for trees that may be overshadowing solar panels due to growth.
Before purchasing solar panels, check the track record of the company that is selling them. Many panels come with lengthy warranty periods of up to twenty five years, but this warranty is only good if the company is still in business. Make sure to ask how long the company has been in operation and check ratings with organizations like the BBB before making your purchase.