It could be more than enough as once a year is what I used to do
When you do not keep up with things you could end up paying dearly for it. This was my lesson l acquired when it came to my central heating plus cooling system. I had not had my air duct cleaned in about 2 years plus this was the biggest mistake I could have made. Because by not getting my air duct cleaned in almost 2 years, it caused the central heating plus a/c plan to labor overtime plus then it ended up breaking down to the point where you could not even do any kind of Heating plus Air Conditioning repair to save it. That cost me many thoUnited Statesnd dollars to then be forced to get a brand new, modern, easily extravagant but pretty powerful central heating plus cooling system. Ever since I had to buy this easily extravagant new heating plus cooling plan I made a promise to myself that I would get my air duct cleaned once every 6 weeks. That is twice a year. It could be more than enough as once a year is what I used to do. But I want to be on the safe side because I never want to have my central heating plus a/c plan die on me again appreciate that to where I have to invest in a totally brand new central heat plus a/c unit. That was an extravagant thing I did not need to pop up! Had I cleaned my air duct, it would have never happened. A lavish lesson I l acquired that time let me tell you!