When Should You Schedule HVAC Maintenance? (2026 Guide)

Schedule AC maintenance in March or April and heating maintenance in September or October. This timing prepares each system before its heavy-use season and gives you time to address any problems the technician finds. A tune-up costs $200 to $325; an emergency repair starts at $400 to $650 and goes up from there.

Spring Maintenance: Prepare Your Cooling System

March and April are the ideal months for AC maintenance in the Philadelphia area. The cooling system has been sitting idle since September, and several things happen over winter:

Leaves, dirt, and debris collect on the outdoor condenser coil
Electrical contacts can corrode from moisture exposure
Refrigerant levels may have dropped from slow leaks
The condensate drain can clog with algae or sediment
Capacitors weaken over time, especially through temperature cycles

A spring tune-up catches all of these before the first 90-degree day hits Philadelphia in June.

What Happens During an AC Tune-Up

Clean condenser coil: The outdoor coil gets rinsed to remove dirt and debris that block airflow and reduce efficiency.
Check refrigerant charge: The technician measures suction and discharge pressures to confirm the system has the correct amount of refrigerant.
Inspect electrical components: Capacitors, contactors, and wiring are tested and tightened. A weak capacitor is a $25 part that, if it fails, can take out a $800 fan motor.
Clear condensate drain: The drain line is flushed to prevent water backups that can damage ceilings, walls, and the equipment itself.
Test thermostat operation: Cooling mode, fan modes, and temperature accuracy are verified.
Measure temperature split: The temperature difference between supply and return air should be 15 to 20 degrees. Outside this range indicates a problem.
Replace air filter: A clean filter improves airflow, efficiency, and indoor air quality.

Fall Maintenance: Prepare Your Heating System

September and October are the right months for furnace, boiler, or heat pump maintenance. Your heating system is about to work hard for 4 to 5 months straight, and problems that developed over the summer need to be caught now.

What Happens During a Heating Tune-Up

For a gas furnace:

Inspect and clean burners: Dirty burners cause uneven flames, poor combustion, and carbon monoxide risk.
Check heat exchanger: A cracked heat exchanger can leak carbon monoxide into your home. This is the most important safety check of the year.
Test ignition system: Hot surface igniters and flame sensors are tested and cleaned.
Verify gas pressure: Proper gas pressure ensures complete combustion and rated heat output.
Check flue and venting: The exhaust path is inspected for blockages, corrosion, or improper pitch.
Test safety controls: High limit switches, rollout switches, and pressure switches are verified.
Carbon monoxide test: Combustion gases are measured to confirm safe operation.

For boilers, the technician also checks water pressure, inspects the expansion tank, tests zone valves, and bleeds air from radiators or baseboard.

The Cost of Maintenance vs. Emergency Repair

Here is the math that makes maintenance worthwhile:

A tune-up costs $200 to $325 per visit, or $250 to $500/year on a maintenance plan with two visits.
An emergency service call in the Philadelphia area starts at $400 to $650 just for the diagnosis, before any parts or labor for the actual repair.
A failed compressor replacement (no warranty) costs $1,950 to $3,900.
A cracked heat exchanger replacement costs $1,950 to $4,600, and often makes more sense to replace the entire furnace.

One prevented emergency per year more than covers the cost of maintenance. Over the life of the equipment, regular maintenance also extends lifespan by 3 to 8 years, delays the cost of full system replacement, and keeps your energy bills lower.

Do Not Wait Until Something Breaks

Most HVAC problems build gradually. A system that seems fine may be losing refrigerant, drawing excess amperage, or running with a cracked heat exchanger. By the time symptoms become obvious (no cool air, strange noises, a gas smell), the problem has escalated from a minor fix to a major repair or safety hazard.

Annual maintenance is the simplest way to protect your equipment, your comfort, and your budget. Call McCorry Comfort at (215) 379-2800 to schedule your tune-up. We serve Philadelphia, Bucks County, Montgomery County, and Delaware County.

Frequently Asked Questions

When should I schedule AC maintenance?

Schedule air conditioning maintenance in March or April, before the cooling season begins. This ensures your system is clean, properly charged, and ready for summer. If any repairs are needed, you have time to address them before the first heat wave.

When should I schedule heating maintenance?

Schedule furnace or boiler maintenance in September or October, before heating season starts. A fall tune-up catches problems while the weather is still mild, so you are not scrambling for repairs on the first cold night.

How much does an HVAC tune-up cost?

A single HVAC tune-up in the Philadelphia area costs $200 to $325 without a maintenance plan. With a plan ($250 to $500 per year), you get two tune-ups included plus priority scheduling and repair discounts.

What happens during an AC tune-up?

The technician cleans the evaporator and condenser coils, checks refrigerant levels, tests electrical connections, verifies thermostat operation, inspects the condensate drain, checks capacitors and contactors, and measures airflow and temperature differential across the coil.

Can I skip HVAC maintenance if my system is running fine?

Your system may seem fine while problems build silently. Low refrigerant, dirty coils, loose wires, and failing capacitors all reduce performance gradually. By the time you notice a problem, the damage is often more expensive to fix. Annual maintenance catches these issues early.

When Should You Schedule HVAC Maintenance?