Free HVAC Maintenance Calculator

HVAC Filter Change Calculator

Estimate when to check and replace your AC or furnace air filter using the manufacturer's recommended interval, HVAC usage, pets, household dust and current filter condition.

Calculate Filter Change Schedule

AC & Furnace Filter Schedule

Find your next HVAC filter change window.

For the broader maintenance schedule, see our guide on how often to change an AC filter . Regular filter checks can also be included in routine HVAC maintenance .

Calculate Your HVAC Filter Change Schedule

Start with the filter manufacturer's stated replacement interval, then adjust for your home.

Manufacturer Replacement Interval Check the filter packaging or HVAC manual when possible.

HVAC System Usage

Pets in the Home

Dust / Construction Conditions

Current Filter Condition

Time Since Last Filter Change

Suggested Filter Replacement Window - -

- Estimated Days Per Cycle

Base Interval -

HVAC Usage -

Pets -

Filter Condition -

Need help with HVAC maintenance?

Request HVAC help below if filter condition, airflow or system performance is becoming a concern.

Important: always follow the filter manufacturer's instructions and the requirements of your HVAC equipment. This calculator is a maintenance reminder tool. Inspect a filter sooner if it becomes visibly loaded or airflow appears restricted.