furnace repair

https://alpha-wiki.win/index.php/When_Your_AC_Stops:_A_Practical_Guide_to_Cooling_System_Repair

My furnace just started making this loud banging noise last night, and I have no idea what's wrong with it. I've checked the air filter and made sure the vents are open, but it keeps cycling on and off every few minutes. I think I might need to call someone out for furnace repair before the really cold weather hits this weekend, because I can already tell it's struggling to keep the house warm.