Contrary to popular belief, most homes are well-suited for solar. When it comes to how much energy a system will generate, it’s the number of hours of sun–rather than the temperature of the air–that matters most. This means that a few hours of sunlight in the summer is just as powerful as a few hours of sunlight in the winter months and vice versa.
The main scenario where solar energy might not make sense is if there are trees or nearby structures that provide shade over your roof for most of the day.