Monthly Tasks (Year-Round)

Monthly

Every Month

  • Check the air filter — replace if dirty (in Fresno's dusty summer, replace every 4–6 weeks instead of the standard 90 days)
  • Make sure all supply and return vents are open and unobstructed by furniture or drapes
  • Check your thermostat display to confirm it's operating correctly and holding setpoint
  • Listen for any new or unusual sounds when the system starts or runs
  • Check that the area around the outdoor unit is clear of weeds, debris, and obstructions (18" clearance)

Spring Checklist (March–April): Prepare for Cooling Season

Spring

Before the First Hot Day

  • Replace the air filter with a new one
  • Visually inspect the outdoor condenser unit — remove winter debris, check for damage
  • Gently rinse the condenser coil fins with a garden hose (spray from inside out) to remove dust buildup from the rainy season
  • Check that the condensate drain line isn't clogged — pour a cup of diluted bleach down the drain pan to prevent algae growth
  • Test your thermostat by switching to cool and confirming the system starts and blows cold air
  • Check the insulation on refrigerant lines running to the outdoor unit — replace if cracked or missing
  • Schedule a professional AC tune-up — book early, appointments fill by May

What a Professional Spring Tune-Up Includes

A DIY visual inspection is valuable, but it can't replace what a technician checks during a professional tune-up:

  • Refrigerant pressure and charge verification
  • Electrical component testing (capacitors, contactors, relays)
  • Evaporator and condenser coil cleaning
  • Blower motor amperage check
  • Condensate drain flush and treatment
  • Thermostat calibration
  • Overall system efficiency assessment

A system that's been professionally maintained runs at or near its rated efficiency. A neglected system can lose 5–25% of its efficiency over time without obviously failing.

Summer Checklist (June–September): Peak Season

Summer

During Peak Season

  • Check the air filter every 4 weeks (Fresno's dust loads filters faster in summer)
  • Keep outdoor unit clear of cottonwood seeds that pile up in June
  • Check for ice on refrigerant lines near the indoor unit — if present, turn system to "fan only" and call for service
  • Make sure attic ventilation is functioning (attic heat radiates down and increases AC load)
  • If you have a programmable thermostat, confirm your summer schedule is active

Fall Checklist (September–October): Prepare for Heating Season

Fall

Before the First Cold Night

  • Replace the air filter
  • Test your furnace before you actually need it — turn heat on and confirm it ignites and runs for 15 minutes
  • Check your carbon monoxide detectors and smoke detectors — replace batteries
  • Inspect the furnace flue/vent pipe for corrosion, disconnected sections, or pest nests
  • Clear the area around the furnace of any stored items (maintain 3-foot clearance)
  • Schedule a professional furnace tune-up — September bookings beat the November rush

Annual Professional Maintenance: What to Schedule and When

The ideal schedule for Fresno homeowners:

  • February–April: AC tune-up (before the cooling season)
  • September–October: Furnace tune-up (before the heating season)

Annual professional maintenance typically costs $89–$150 per system. Many companies (including Central Elite) offer maintenance plans that bundle both visits at a discount. Given that a single emergency AC repair in summer can cost $300–$1,500, the ROI on preventive maintenance is very strong.

Warranty protection: Many HVAC manufacturers require documented annual maintenance to keep the parts warranty valid. Keep your service receipts. If your system fails and you need warranty coverage, you'll need proof of annual maintenance — verbal assurances from a contractor aren't enough. Make sure your technician provides a written service report.

When DIY Ends and Professional Service Begins

Homeowners can safely do: filter replacement, debris clearing around outdoor unit, condensate drain flushing, and basic thermostat operation. Everything involving refrigerant, electrical components, gas pressure, heat exchanger inspection, or combustion analysis requires a licensed HVAC technician. Attempting these without proper tools and training creates safety risks and can void warranties.

Ready to schedule your tune-up? Book an AC maintenance visit or furnace tune-up, or call (559) 254-4680.