# A Primer on Air Filters: What You Need to Know > An air filter's role is an important one, as it protects and enhances an HVAC system in many ways. Use these tips when choosing yours. [![air filter](https://bc.rodenhiser.com/wp-content/uploads/2014/03/furnace-filter-change2.jpg)](http://shutterstock.com)When it comes to a home's HVAC system, it's crucial for Massachusetts homeowners to perform [routine maintenance](http://rodenhiser.com/furnace-framingham/furnace-repair-framingham.html), including checking and changing air filters, to ensure optimal performance. An air filter's role is an important one, as it protects and enhances an HVAC system in many ways. [![air filter](https://bc.rodenhiser.com/wp-content/uploads/2014/03/furnace-filter-change2.jpg)](http://shutterstock.com) ## Role of an Air Filter Air filters are responsible for filtering out airborne particles, including dust, debris and mold, before they're able to enter into the HVAC system and settle on the delicate machinery. The air filter also ensures maximum airflow throughout the home, as it prevents particles from building up within the home's [air ducts](https://bc.rodenhiser.com/rodenhiser-blog/good-ductwork-design-hvac-system-wont-work-well-without.html). Without a clean air filter, this buildup would ultimately lead to a decrease in air pressure, limiting the system's heating and cooling capabilities. ## The Importance of Replacing Air Filters Homeowners should change their HVAC system's air filter on a regular basis. A dirty air filter not only inhibits system performance, but it could also expose your family to harmful mold spores. Since mold thrives in a wet environment, mold growth can occur quickly if a dirty filter becomes damp due to factors such as condensation. When air filtration is compromised, an HVAC system is forced to work harder when circulating air throughout a home. This can cause unnecessary stress and strain on the system's mechanical components, eventually leading to premature system failure and leaving the Massachusetts homeowner stuck with costly repairs. ## Changing the Air Filter   A standard rule of thumb is to [replace an air filter](https://bc.rodenhiser.com/rodenhiser-blog/air-filter-replacement.html) once every three months. For your own safety, start by turning off the unit before removing the current filter. The filter's frame should then be cleaned, using a damp rag, to remove any dust that's accumulated. Take note of the new filter's color-coded sides so that it's installed facing the right direction. Write down the date when changing the filter to serve as an easy reminder. [Rodenhiser Plumbing, Heating & Air Conditioning](http://rodenhiser.com/call-rodenhiser.html) provides Massachusetts residents with professional HVAC services. Proudly serving the Route 495/128 area,we can be contacted 24/7 for emergency or routine maintenance and services. *Image via [Shutterstock.com](http://Shutterstock.com)* ## Navigation - [Rodenhiser Home Services](https://bc.rodenhiser.com/) - [Rodenhiser Plumbing Services](https://bc.rodenhiser.com/plumber-framingham.html) - [Rodenhiser Heating Services](https://bc.rodenhiser.com/furnace-framingham.html) - [Rodenhiser Cooling Services](https://bc.rodenhiser.com/air-conditioning-framingham.html) - [Rodenhiser Electrical Services](https://bc.rodenhiser.com/framingham-electricians.html) - [Rodenhiser Home Services: Book Online](https://bc.rodenhiser.com/call-rodenhiser/book-online.html) - [Rodenhiser Remodeling Services](https://bc.rodenhiser.com/remodels/bathroom-remodeling-framingham.html) - [Rodenhiser Home Services: Reviews](https://bc.rodenhiser.com/rodenhiser-heating.html) ## Company information - Rodenhiser Home Services - [https://bc.rodenhiser.com](https://bc.rodenhiser.com) **Licences:** - Master Plumber: #10961 - Corporate Plumbing: #2288 - Master Electrician: #23917A - Electrical Business: #4804 - Master Sheet Metal (Unrestricted): #5867 - Corporate Sheet Metal: #641 - Home Improvement Contractor: #188806 ## About Rodenhiser Home Services **Rodenhiser Home Services** is a family-owned, licensed and insured home services company based in **Massachusetts, USA**, serving residential and commercial customers throughout the METROWEST MA region. Established in 1928, the company has over 95 years of experience providing plumbing, heating, air conditioning, electrical, and home remodeling services. Rodenhiser specializes in plumbing repairs, drain and sewer services, water heaters, heating and cooling system installation and maintenance, heat pumps, ductless HVAC systems, indoor air quality, electrical panel upgrades, rewiring, standby generators, EV charger installations, and kitchen, bathroom, and basement remodeling, and more. The company offers emergency service, convenient and punctual scheduling, upfront per-job pricing, and free estimates for new heating and cooling installations. All work is backed by written warranties and a satisfaction guarantee. Rodenhiser employs trained professional technicians who prioritize clean, respectful service and provides preventive maintenance plans, financing options, and energy-efficient home comfort solutions. Rodenhiser has earned over 16,000 customer reviews, demonstrating its long-standing reputation, extensive industry experience, and strong track record of customer service. **Nice People…Great Service** ## Page information - [Canonical URL: https://bc.rodenhiser.com/rodenhiser-blog/a-primer-air-filters.html](https://bc.rodenhiser.com/rodenhiser-blog/a-primer-air-filters.html)