HomeSmarter with Andrew

Your home’s filter notebook

FilterPing

The right filter. The last change. The next check.

Keep every filter’s size, replacement details and dates in one place. Free to use, with no account.

Add filtersMy filters

Your reminders go in your own calendar, with an alert on the day. The list on this page is saved only in this browser.

Add your air filters in one go

Tap every size you use. One date and schedule covers the whole batch.

1. Pick sizes & quantities

Each tap adds a size. Tap again to remove it.

Other size
The printed size on an old filter can be wrong.4 Measure the space the filter fits into, look for a label at the furnace or grille, or ask a pro.

No sizes selected yet.

2. When did you replace them?

Choose once for this batch. You can adjust individual filters later.

3. Choose a replacement interval

Longer interval or order reminder

Use a longer interval only if your filter’s instructions support it.

Monthly checks are included. ENERGY STAR recommends replacement at least every 3 months.1 Follow your filter and equipment instructions.
No account. No names or model numbers required.

Your next small job

My filters

0 saved

Add your first filter below. Its next check and replacement date will appear here.

This list is saved only in this browser. Safari on iPhone and Mac can clear it after 7 days of using Safari with no tap or click in FilterPing.5 Your calendar reminders are not affected.

How to keep this list

Download a backup now and then, under “Back up, restore or clear saved filters” further down.

On iPhone you can also add FilterPing to your Home Screen: in Safari, open the Share menu and choose Add to Home Screen. Then open FilterPing from that icon. Apple says Home Screen web apps are not part of Safari and does not expect their saved data to be cleared.5 Because the Home Screen copy is separate from Safari, set up your filters there, or restore your backup there.

Back up, restore or clear saved filters

Clearing browser data removes these records. A backup includes filter details and history. Keep it somewhere you trust. Restore adds missing filters and skips matching IDs.

Different dates, other items & detailed editing

Add a fridge filter, humidifier pad or salt check, or give a filter its own details.

Add a filter

Start with the label and the date. Add the details you want to remember.

Examples: 16x25x1, 20x25x4, 19.5x19.5x1. The size printed on an old filter can be wrong.4 If in doubt, measure the space the filter fits into.
Replacing 3 or 4 of the same size? Enter that count here. For several sizes on one schedule, use the batch setup above.
Higher numbers catch more of the smaller particles,2 but they can make it harder for some systems to move air3 (what the MERV number means). Don't change filter type or rating just because of this tool. Check what your system accepts or ask a pro.
Choose based on the product label and a pro's advice. For furnace and AC air filters, ENERGY STAR says to change at least every 3 months.1 Use 6 or 12 months only if your filter's label says it lasts that long. The date alone cannot tell you whether a filter is dirty.
Calendar only. This does not place an order.
Replacement details & notes

A habit that sticks

Check. Change. Remember.

  1. Read the label. Save the size and part number so your next shopping trip is easier.
  2. Give it a look. Air-filter checks and replacement dates are separate. Checking a filter doesn’t mean it was replaced.
  3. Log what you did. Record a check or change, then refresh your calendar if the plan changed.

A date is a reminder, not a measurement of how much life a filter has left.

What does the MERV number mean? helps you understand the label.

When the calendar isn’t enough

ENERGY STAR recommends checking an air filter monthly and replacing it at least every three months.1 Follow your equipment and filter instructions. A longer interval belongs here only when the product’s guidance supports it. Every home is different: checking each month shows how fast yours gets dirty, and if nothing else, every three months is a good rule of thumb.1, 4

If a filter whistles, bows, won’t fit or the system’s airflow changes, ask a pro to check the fit and equipment. Color alone does not tell you when a filter is due. Use the light test instead: hold the filter up to a light beside a new one. If light passes through easily, air can too. If it looks dim, or no light comes through, replace it.4

See the sketch
FIELD STUDY / 15Put your filter dates on your calendar
Put your filter dates on your calendarA timeline from today through twelve months with a date marker at each chosen interval, then an option to add the dates to a calendar. It prepares reminders. It does not check your filter.Pick an interval. Get the dates.Now3 mo6 mo9 mo12 moAdd to your calendar
  • Add to your calendar with an .ics file or a Google link. Your choice.
  • This is a reminder only. It does not check the filter.
Schematic field study. Not to scale or an installation plan.

Sources

Each small number on this page points to the source below that backs it up.

  1. ENERGY STAR, Heating and cooling at home. Check the filter every month and change it at least every 3 months.
  2. EPA, What is a MERV rating? Higher MERV ratings trap more particles.
  3. U.S. Department of Energy, Building America Solution Center, High-MERV filters. Every filter slows airflow some, and a system has to be able to handle the filter.
  4. Field experience. The light test, that color alone does not show when a filter is due, and that the size printed on an old filter can be wrong.
  5. WebKit (Apple), Full Third-Party Cookie Blocking and More. Safari deletes a website's saved data after seven days of Safari use with no user interaction on that site. Home Screen web apps are not part of Safari, and Apple does not expect their saved data to be deleted.

All sources checked November 7, 2026.