Upcoming Due Dates
Full Service History
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How to Use the Maintenance Log Calculator
Choose the equipment type, review the professional service interval (12 months by default), and select a filter change interval based on the specific filter used.
Enter the date and type of service for every maintenance visit on record, along with any relevant notes. Dates cannot be in the future.
Check that the chronological service history accurately reflects what's been done on the equipment.
Click Calculate Next Service to see the recommended next maintenance date, then export the log for warranty or service records.
Why an HVAC Maintenance Log Matters
A maintenance schedule that lives only in someone's memory tends to slip. A logged, dated history does two things a memory can't: it reliably calculates when the next visit is actually due, and it provides documented proof of maintenance if a warranty claim or a dispute ever comes up.
Filter Changes Are the Most Frequent, Most Skipped Task
Filter changes happen far more often than professional tune-ups, which paradoxically makes them the easiest maintenance item to lose track of. A standard 1-inch filter typically needs changing every one to three months depending on household dust levels and whether pets are present, while thicker media filters can often go six to twelve months. A higher-rated filter is not automatically a longer-lasting one, and the MERV rating calculator helps match a rating to the household before you set the interval here. Logging the actual filter type and interval, rather than guessing, keeps this simple task from becoming the reason a system underperforms.
Professional Tune-Up Frequency by Equipment Type
A professional visit at least once a year is the common baseline for a furnace, air conditioner, heat pump, or boiler, and the US Department of Energy's heat pump guidance says the same while asking for filters to be cleaned or changed every three months or as the manufacturer directs. Some contractors suggest a visit before each season for a heat pump or ductless system that runs year-round instead of sitting idle for half the year. This tool therefore defaults every equipment type to 12 months and lets you set a shorter interval, such as 6 months, when that is the contractor's or manufacturer's recommendation. The manufacturer's documented schedule for the installed model always takes priority over a single rule applied across every system.
The Warranty Connection
Many manufacturer warranties exclude failures caused by neglected or improper maintenance, and some ask for proof of service, so a claim can be denied if an inspector decides a failure resulted from upkeep that was skipped. A dated log with service type and notes for each visit is often the difference between a warranty claim that gets approved smoothly and one that gets disputed over missing documentation. The log also helps with safety: Health Canada asks for fuel-burning appliances to be inspected by a professional at least once a year, and a dated entry shows when that last happened.
One Log Per System
On a property with multiple HVAC systems, such as a furnace plus a separate ductless unit serving an addition, running a separate log for each system keeps intervals and history clear rather than blending different equipment types and schedules into one confusing record. It also makes budgeting easier, since each system's visits can be priced separately, and the HVAC maintenance cost calculator is a useful starting point for what a year of visits should cost. The warranty calculator in this category shows exactly what coverage remains on each system.
Frequently Asked Questions
Standard 1-inch filters typically need changing every 1 to 3 months depending on filter type, household dust levels, and whether pets are present. Thicker media filters, often 4 to 5 inches deep, can sometimes go 6 to 12 months between changes. Checking the specific filter's rated lifespan and inspecting it periodically is more reliable than following a single fixed rule for every situation.
A professional tune-up at least once a year is the common baseline for a furnace, air conditioner, heat pump, or boiler. Some contractors recommend a visit before each season for a heat pump or ductless system that runs year-round, which is why this tool lets you set the interval in months. Following the specific manufacturer's recommendation for the installed equipment is more reliable than a generic industry rule.
Many manufacturer warranties exclude failures caused by neglected or improper maintenance, and some ask for proof of service. A claim can be denied if a failure is linked to a lack of maintenance that could have prevented it. Keeping a dated maintenance log is one of the simplest ways to protect a warranty claim if a dispute ever arises.
Yes, though for a property with several HVAC systems it's generally clearer to run a separate log for each piece of equipment, since maintenance intervals and service history can differ significantly between, for example, a furnace and a ductless mini-split serving a different area of the same building.