There can be big impact even in little things, and finding the right furnace filter can not only save money, but also improve air quality. Overly dense or dirty furnace filters can slow airflow too much, but low-efficiency filters don’t filter dust very well. All filters are rated for efficiency by a MERV rating from 1 to 16. The higher the number, the more efficient the filter. It is essential to get a better understanding of the issues and learn how to find the right filter for your furnace.
Standard Throw Away Filters – Are the least expensive filters, but can only stop the largest of dust particles, allowing most dirt to travel right through.

Disposable Pleated – Slightly more expensive of an option, but more popular, they are made from pleated polyester or cotton paper. They remove some small particles like spores and mites, but can add more resistance to the air flow. These filters usually needs to be changed more frequently to avoid clogging and taxing your HVAC system. Pleated filters often come in thicker sizes with more filter area to compensate.

Disposable Electrostatic – The most expensive disposable filter, they contains self-charging electrostatic cotton or paper fibres that attract and trap small particles.

Permanent Electrostatic – Similar to their disposable brethren, these contain self-charging cotton fibers that attract particles. Permanent options are removable and washable filters that can last six to eight years.

Electronic Air Cleaners – Are an older technology that can be fairly effective, but are costly to maintain and emit ozone gas (which is known to be harmful) into your home.

Electronic Air Purifiers – Such as the Carrier Infinity Air Purifier is a newer technology filter that features a capture and kill technology that has a 99% germicidal effectiveness, a MERV 15 rating and operate in silence.