HVAC Maintenance Checklist

Your heating and cooling system works hard year-round, and a little regular care can help it last longer, run more efficiently and break down less. Some tasks are easy to do yourself, while others are best left to a licensed technician. Use this checklist to stay on top of both.

Monthly tasks

These take just a few minutes:

• Check the air filter. Replace or clean it when it looks dirty. Many homes need a new filter every one to three months, more often with pets, allergies or construction dust.
• Listen for unusual noises. Rattling, squealing or banging can point to loose parts or worn motors.
• Keep vents and returns clear. Furniture, rugs and curtains blocking airflow make the system work harder.
• Check the thermostat. Make sure it's set correctly and replace batteries if it uses them.

Spring checklist: before cooling season

Get your air conditioning ready before the first heat wave:

1. Clear around the outdoor unit. Remove leaves, branches and debris. Trim plants back to leave space for airflow.
2. Rinse the condenser coil gently with a garden hose if it's dirty, with the power off at the disconnect.
3. Check the condensate drain. Make sure the line near the indoor unit drains freely. A clogged line can cause leaks or shut the system off.
4. Inspect the refrigerant lines. Look for damaged or missing insulation on the larger line.
5. Test the system. Run the AC for a while and make sure it cools evenly.
6. Schedule a professional tune-up. A technician can check refrigerant levels, electrical connections, capacitors and coils.

Learn how plans typically cover cooling equipment on our air conditioning coverage page.

Fall checklist: before heating season

Prepare your furnace or heat pump before the weather turns:

1. Replace the filter.
2. Test the heat before you really need it. Note any burning smell beyond the brief dust smell of the first run.
3. Check carbon monoxide detectors. Test them and replace batteries. This is essential with gas, oil or propane appliances.
4. Clear the area around the furnace. Don't store flammable items nearby.
5. Check exhaust and intake vents outside for blockages like nests or snow.
6. Schedule a professional inspection. A technician can check burners, the heat exchanger, ignition, flame sensor and safety controls.

Our heating coverage page explains common terms for furnaces and heat pumps.

Tasks best left to a pro

Some work requires training, tools or a license:

• Handling refrigerant.
• Electrical repairs inside the units.
• Gas valve, burner or heat exchanger work.
• Duct sealing or repairs in hard-to-reach spaces.
• Diagnosing performance problems.

Don't forget the ductwork. Leaky or crushed ducts in attics and crawlspaces can waste conditioned air and make some rooms hard to heat or cool. A technician can check accessible ducts during a tune-up. Our ductwork coverage page explains how plans often treat duct repairs.

Signs you need service now

Don't wait for the next scheduled visit if you notice:

• No heat or no cooling.
• Ice on the AC lines or coil.
• Water pooling near the indoor unit.
• A gas smell. Leave the house and call your gas utility from outside.
• A carbon monoxide alarm. Get everyone out and call 911.
• Frequent cycling on and off.

Keep maintenance records

Save receipts and reports from every tune-up and repair, and keep a simple log of filter changes with dates. These records help technicians spot patterns, and they can matter for warranty claims. Many home warranty contracts exclude failures caused by lack of maintenance, and an administrator may ask what care the system received.

A practical tip: write the date on each new filter with a marker before you install it, and set a phone reminder for your next check. It's the easiest way to stay consistent.

How Warranty Wizards can help

We help homeowners compare home warranty plans from third-party providers and explain each plan's maintenance expectations and HVAC coverage before you buy. Request a free quote to compare options.