Your chimney won't need cleaning just burning gas. Check it every so
often for cracks or leaks, more often in earthquake country. Take a
look up a wood-burning chimney with a flashlight to check the creosote
buildup; never got ashes in my face--honest!
The flue might get a rust or corrosion hole in it and need replacement, but
if it has anything to clean, you need a new furnace.
Chimney people make a living cleaning chimneys, and they make more per hour
when there is nothing to clean. I have a wood stove, I clean the chimney
annually, and get a teacupful of fluffy stuff out. Not every chimney gets
dirty but some do, except for gas chimneys, which pretty much can't.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.