When it comes to furnace filters, the debate between 1-inch and 2-inch filters is a common one. While the thickness of the filter is an important factor, there are other considerations to take into account when deciding which type of filter is best for your home. The lifespan of a filter is one of the most important factors to consider. Generally speaking, a 2-inch filter will last longer than a 1-inch filter, as it has more media.
However, this isn't always the case; thicker filters, known as media filters, are usually more effective than cheaper 1-inch filters. The size of your furnace's air filter compartment is also an important factor. If it's only 3 inches deep, then a 1-inch filter is the better choice. However, if you have the space for a 4-inch filter, then this is the best option.
A 4-inch filter will have twice as much surface area as a 2-inch filter and will be able to trap more particles in the air. When it comes to cost, 1-inch filters are usually cheaper than 4-inch filters. However, they need to be replaced more frequently and don't offer as much protection from airborne particles. If you suffer from allergies or respiratory illnesses, then investing in a medium-efficiency MERV filter may be worth it in the long run.
Ultimately, when deciding between 1-inch and 2-inch furnace filters, you should consider your budget, the size of your furnace's air filter compartment and how much protection you need from airborne particles. A good quality passive filter may be sufficient for most households, but if you need more protection then investing in a thicker filter may be worth it.