**Lennox 15 y/0 gas-fired furnace (not NG)
**Ran dirty and sooty for years until (finally) got tech back to clean and install the device that introduces gas into the thing-been running fine this heating season
**Fairly new MERV 12 filter (been running these for years w/o a prob.
**Just whalago (while a go here in Dixie) the motor took 2-3x longer than usual to get up to speed. Sounded sorta like an older car w/the battery down or starter beginning to go.
**I have THOUGHT here recently that it was taking longer, but hadn't really listened for it.
Thoughts and opinions are appreciated and noted.