Well, it determines what kind of furnace you have, and how long you have it until the last time it was installed. It is recommended every 5-10 months or longest is 1 year. Now if you don't have it done it that amount of time, you risk going and having to spend $200-$300 on a new furnace motor. You must contact you service provider to lubricate your motor.
A furnace should cycle on and off after every 4 hours.
I heard that you should have ducts cleaned but I don't know how often. How often should furnace duct cleaning be done and how much does it cost?
You should change a furnace filter every 2-4 months.
The furnace that is working properly should cycle on and off after every 3 - 4 hours.
One every month if you have allergies.
How often you furnace should be cleaned depends on your personal household circumstances. Things such as whether or not: you own pets, have many people living in the household, have allergies or asthma. Experts believe you should have you furnace cleaned at least once every two years, or once a year in households with pets and/or children.
What type, band of furnace do you have? Look on the furnace for company name and manufacture. You maybe able to contact company who last cleaned and serviced system. They often leave a sticker on furnace for future service.
1000hrs
you should change it from every 2-3 months to every 3-4 months.
The torque links on a Cessna 182 aircraft should be greased every fifty hours of flight as per the Airframe Maintenance Manual.
A standard 1" non-pleated furnace needs to be changed once every 30 days.
Furnace