Too a lot filth or soot? We blank burners, adjust air-fuel combine

https://telegra.ph/Furnace-Efficiency-Ratings-Explained-What-Do-They-Mean-for-You-Conclusion-Making-Informed-Decisions-for-Your-Home-01-28

Too an awful lot filth or soot? We fresh burners, adjust air-fuel combine, and update filters to improve air high quality and reduce furnace residue buildup.