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A/C & Furnace Filter Replacement Services in Appleton & the Fox Valley

Modern Sheet Metal is your local source for air conditioning and furnace filter replacements and products in Appleton and the Fox Valley! To help you gain the longest lifespan possible for your furnace or air conditioning unit, you will want to ensure that you are replacing your air filter as regularly as possible.

Many home and business owners are fine with replacing their own furnace and A/C filters. However, you can always opt for a professional service if needed. For your peace of mind, our technicians are backed by our Carrier certified dealer certification. We also have decades of experience with both A/C and furnace filter replacement services.

At Modern, we stock a wide variety of humidifier filters, furnace filters, and water panels to serve your needs from the brands Carrier and Aprilaire. These furnace filters include the Infinity air purifier, Performance filter cabinet, etc.

If you are looking for another furnace or air conditioning filter besides what’s listed below, please give us a call at (920) 733-4713 and we’ll be able to assist you further.

Modern HVAC

2180 American Dr.
Neenah, WI 54956
Phone: 920-733-4713
Fax: 920-733-0882
Mon – Fri: 7:00AM – 4:30PM

Emergency HVAC Services Available

Infinity Air Purifiers

Carrier’s Infinity Air Purifier whole home air purification system. Call us at (920) 733-4713 for questions about a furnace filter replacement in Appleton or to order today!

  • Whole home air purification system
  • Long-life MERV 15 furnace filter
  • Patented Captures and Kills™ technology
  • Captures up to 95% of particles .30 to 1.0 microns in size
  • Kills or inactivates up to 99% of germs, pollen and mold captured
  • Proven effective against 13 common pathogens
  • 10-year parts limited warranty
Carrier Air Cleaner

Performance Filter Cabinet & Air Furnace Filters

Introducing Carrier’s Performance Filter Cabinet and Air Furnace Filter. This is an easy-to-replace air filter. For questions or to order, please call us at (920) 733-4713.

  • MERV 8 efficiency
  • Easy-to-replace cartridge style furnace filter
  • Low pressure drop for system protection
  • Superior particle removal
  • Improved indoor air quality
  • Standard or continuous fan operation
Residential Carrier Filter

Need a different air filter? Call us at (920) 733-4713 for more options!

Types of A/C & Furnace Filters

One of the ways to know how often you should perform an A/C filter replacement and/or furnace filter replacement is to determine the kind of air filter you have. Depending on the type of filter you own, you may have to change it out every 30 days to once a year:

Fiberglass Filters

These are commonly the least expensive option of air filter available. Usually, this filter type is around one inch thick. These filters provide basic level filtration and are disposable. If you have a fiberglass filter, you will want to change them out every 30 days.

Polyester/Pleated Filters

These filter types are available in several widths. No matter the width, however, they are better at sifting through airborne pollutants when compared with standard fiberglass filters. You can leave your polyester/pleated filter for about 3 months before changing it.

Washable Air Filters

These filters aren’t quite as common. As their name implies, instead of removing and disposing of this filter, you can remove, clean, and then place the filter back into your HVAC system for further use.

A/C & Furnace Filter Replacement FAQs

How often to change furnace filters?


You may be wondering how often you’ll need to change your air filter. The answer is that it depends on the system you have. Some air filters will need to be replaced every 30 to 60 days while others can be changed out every 6 to 12 months. When in doubt, check with your HVAC technician or follow the manufacturer’s recommendations. Here are some general guidelines to follow:

For 1″ – 2″ filters, replace them every 1-3 months
For 3″ – 4″ filters, replace them every 6-9 months
For 5″ – 6″ filters, replace them every 9-12 months


If you have further questions about knowing when your furnace filter needs replacement, please check with the Modern HVAC team.

Furnace humidifier filter replacement how often?


While some humidifier filter replacements should happen several times each year (e.g. every 3 months), generally once per year is enough. Filter replacement depends on the type of air filter you have. When in doubt, talk with your HVAC technician or check the instruction manual to determine the number of times your filter should be replaced.

Reasons to change my furnace filter?

If you neglect to perform a furnace filter replacement, you will eventually experience low airflow throughout your system. As a result, your A/C unit will have to work extra hard to maintain your comfort. This will, in turn, draw more electricity and ultimately increase your energy bills. Regularly updating a clogged filter can increase your A/C system’s efficiency between 5 and 15%.

If you ignore your dirty air filter, it will cause your fan motors and other components within the system to work harder. This can unfortunately shorten the lifespan of your HVAC system if not dealt with. Lastly, to keep you and your family comfortable, you will want to change your filters often. Neglecting a dirty air filter can cause problems with keeping your home cool and may even cause family members to feel uncomfortable with your indoor air quality.

What does MERV mean on furnace filters?


What is Minimum Efficiency Reporting Value (MERV)? This is a rating of the furnace or air conditioning filter’s ability to trap airborne particles and ability to keep good airflow. You will see MERV ratings labeled between 1 and 16. The value 16 stands for the best filtration available on the market.

What if a family member has allergies or asthma?

Do you or another family member have allergies or asthma? The number of times you change your furnace or A/C filter will be paramount to your/their health and comfort. We recommend choosing a filter with 12 to 16 MERV for the most effective removal of airborne particles. Ensure you check your A/C or furnace once a month.

What if I have pets?


If you have pets in your home, you will need to consider several factors as that will determine how often you may need to change your air filter. This includes factoring the number of pets, their size, and their hair length. The more pet dander and hair, the higher volume of airborne particles your air filter will need to trap.

Additionally, your pets will likely bring in additional dirt, dust, bacteria, viruses, and even insects into your home. If you have only one pet, you likely can just follow the recommendations as provided by the filter manufacturer. However, if you have several pets, you should check your air filter at a minimum of once every 30 days.

Where to buy furnace filters/air conditioning filters?

Modern Sheet Metal not only provides air conditioning and furnace filter replacement and installation services, but we also sell furnace filters. If you can’t find the specific furnace filter you need, please contact us today!

Choose Our Air Conditioning/Furnace Filter Replacement Professionals!

If you need assistance with your air conditioning filter replacement/furnace filter replacement, or if you have any concerns, you will need to schedule an appointment with your local HVAC company. Please reach out to Modern Sheet Metal today for assistance with diagnosing and servicing your HVAC system. We also have other heating and cooling products available.

To start with ordering a furnace filter, please give us a call today at (920) 733-4713. A friendly team member will help you order a Carrier or Aprilaire air filter, or schedule a service.

Modern Sheet Metal provides furnace and air conditioner service, repair, replacement and installation throughout Appleton, Neenah, Menasha, Darboy, Kimberly, Kaukauna and Greenville. Please call us at 920-733-4713 to discuss your residential or commercial heating & cooling needs!