One-time setup
Start with your furnace filter. You can change any of this later.
Your furnace filter
Due now
Coming up (next 30 days)
Later
My house specs
Calendar reminders
Download a calendar file with repeating reminders. Open it with your phone or computer calendar and it handles the alerts, no internet needed.
Backup
Save everything (setup, done dates, specs) to a backup .ics file. Import it on a new device to pick up where you left off.