Begin with the existing fireplace.
Share photos of the fireplace, any appliance label, and the opening dimensions if you have them. Fireplace type and condition matter; an insert is not suitable for every existing fireplace.
The chimney deserves a closer look.
An installer should evaluate the existing system and explain any inspection, liner, repair, or other work required for the chosen appliance. Include known issues or past inspection findings in your request.
Tell us what you want to change.
Whether your priority is supplemental warmth, updating an older insert, or planning around outages, include it in the project brief. Ask the installer how the specific appliance operates without electricity.