# HVAC filter reminder on WhatsApp

> A WhatsApp reminder to change your furnace or AC filter on a set schedule, with the filter size saved so you buy the right one every time. 7-day free trial.

Source: https://www.getmindie.app/reminders/hvac-filter (updated 2026-10-31)

## Messages to send Mindie
- Every three months, with the size: "Every 3 months on the 1st at 10am remind me to change the HVAC filter, size 16x25x1"
- Before the heating season: "Every year on 1 October at 9am remind me to book a furnace service"
- Stock up: "Add two 16x25x1 air filters to my shopping list"

An HVAC filter reminder on WhatsApp is a message every few months to swap the air filter, with the size included. With Mindie, send "every 3 months on the 1st at 10am remind me to change the HVAC filter, size 16x25x1" and it repeats on that gap.

The filter sits out of sight, so it gets changed when someone remembers, which can mean once a year. A clogged filter makes the system work harder and lets more dust through.

## When to be reminded

- **Every one to three months,** depending on the filter and your home.
- **More often during heavy use,** like peak summer or winter, or with pets.
- **Once a year before the season,** to book a service if you have one done.

## Why it gets skipped

- **Nothing tells you it's dirty** until it's very dirty.
- **The size is forgotten,** so the change waits for a trip to check the old one.
- **No spare in the house** turns a five-minute job into an errand.

## Habits that help

- **Put the size in the reminder.** No more pulling out the old filter to read it.
- **Keep a spare.** Add filters to your shopping list when you use the last one.
- **Write the date on the new filter** with a marker as you put it in.

## How Mindie handles it

Send the reminder once with the gap and size. Mindie confirms and repeats it, in your timezone. Reply "done" when it's changed, or "snooze 1 day" if you need to buy one first. Ask for your shopping list next time you're at the store.

## What Mindie doesn't do

- **It doesn't order filters** or book HVAC technicians.
- **It doesn't connect to your thermostat** or smart home devices.
- **It doesn't message anyone else.** Reminders come to your own chat only.

## FAQ

### How often should I change the filter?
Many filter makers suggest every 1 to 3 months, sooner with pets or allergies. Check the box or your system's manual and set the gap to match.

### Can I save the filter size?
Yes. Put it in the reminder, or send a note like "note: hallway filter is 16x25x1".

### Can Mindie order filters for me?
No. It can keep them on your shopping list, but it doesn't order anything.

### Can the reminder say which filter to buy?
Yes. Put the size in the reminder, like "replace the 16x25x1 filter", so you have it when you shop.

### Can I add a yearly service reminder too?
Yes. Set a separate yearly reminder for a technician's service, before the season you use it most.

## Related
- [Water filter reminder](https://www.getmindie.app/reminders/water-filter)
- [Smoke detector battery reminder](https://www.getmindie.app/reminders/smoke-detector-battery)
- [Mindie for landlords](https://www.getmindie.app/for/landlords)
- [How to Stop Forgetting Things: A Simple Capture and Cue System](https://www.getmindie.app/blog/how-to-stop-forgetting-things)