HVAC Maintenance for Durham Area Homeowners

Two Service Windows per Year

Durham’s climate creates two clear HVAC maintenance windows:

Spring (March–April): AC systems should be serviced before cooling demand starts. April is better than May. By June, contractor schedules are compressed and parts lead times for common components extend. Spring maintenance catches problems before they produce a July failure.

Fall (September–October): Heating systems should be checked before the first cold weather. In Durham, cold snaps typically arrive in October or November. A fall inspection in September or early October allows time to order parts or schedule return visits before heating is urgently needed.

What Homeowners Can Do

Between contractor visits, homeowners can maintain system performance through:

• Filter changes — every 60–90 days for standard 1” filters; twice yearly for thick media filters. A clogged filter restricts airflow and stresses the blower motor.
• Condensate drain maintenance — monthly bleach treatment to the primary drain line during the cooling season prevents blockage and overflow
• Outdoor unit clearance — 2 feet clear on all sides; trim vegetation in spring
• Register check — supply and return vents should not be blocked by furniture or closed off

What a Maintenance Visit Should Include

The National Weather Service Raleigh and Durham Parks & Recreation represent the regional standard for maintaining infrastructure through seasonal cycles — that standard applies to residential HVAC as well.

A full maintenance visit from a licensed technician includes:

• Refrigerant pressure measurement (not optional)
• Electrical component testing — capacitor, contactor, control board
• Temperature differential across evaporator coil
• Condenser coil cleaning (rinse at minimum; brush cleaning if needed)
• Condensate drain inspection and clearing
• Written summary of findings

If the service summary does not include measured values — refrigerant pressures, temperature differential, electrical readings — it was not a complete inspection. For documented service with measured findings, Comfort First HVAC provides residential HVAC maintenance across North Carolina with written records per visit.