A motorized awning turns a scorching deck into a usable room for most of the year. Once it is installed, you get instant shade with a remote and keep your interior cooler by blocking the sun before it hits your windows.
Installers get slammed once the first warm weekend hits, so book your work in late winter. You will have more scheduling flexibility and often find contractors more willing to negotiate on labor to keep their crews busy during the slow months.
The 18-month window is a deadline, not free money. If you have a remaining balance after the 18 months are up, you will start paying interest on whatever is left, so plan to have it paid off in full by the final month.