How Often Should You Service Your HVAC System?
Quick Answer
You should have your HVAC system professionally serviced twice a year — once in spring before cooling season and once in fall before heating season. Regular maintenance extends equipment life by 5-10 years, prevents costly breakdowns, and keeps energy bills in check.
Your HVAC system is the most expensive mechanical system in your home — replacing it costs $5,000 to $15,000. Yet most people never think about it until it breaks, usually on the hottest day of summer or the coldest night of winter. A $150 tune-up twice a year is the cheapest insurance policy you'll ever buy for your home comfort and your wallet.
Detailed Breakdown
Spring Service (Air Conditioning)
Schedule your AC tune-up in March or April before the summer rush. A spring service should include:
- Refrigerant level check — Low refrigerant means poor cooling and higher energy consumption
- Condenser coil cleaning — Outdoor coils get clogged with dirt, grass, and cottonwood seeds
- Electrical connections check — Loose or corroded connections reduce efficiency and create safety hazards
- Thermostat calibration — Ensures your system runs at the right temperature
- Condensate drain cleaning — A clogged drain can cause water damage and mold growth
- Blower motor inspection — Ensures proper airflow throughout the system
Fall Service (Heating)
Schedule your heating tune-up in September or October before cold weather arrives. A fall service should include:
- Heat exchanger inspection — Cracks in the heat exchanger can leak carbon monoxide
- Burner and ignition check — Ensures clean, efficient combustion
- Gas pressure verification — Incorrect pressure wastes fuel and stresses components
- Safety control testing — Carbon monoxide detectors, limit switches, and flame sensors
- Ductwork inspection — Leaky ducts waste 20-30% of conditioned air
- Blower motor and belt inspection — Worn belts reduce airflow and can break mid-season
Between Professional Visits
Homeowners should do these tasks monthly:
- Change the air filter (see our furnace filter guide for details)
- Clear debris from around the outdoor condenser unit (maintain 2 feet of clearance)
- Check thermostat batteries if applicable
- Listen for unusual sounds — banging, squealing, or grinding indicate problems
- Monitor energy bills — sudden increases suggest declining efficiency
Service Contracts
Most HVAC companies offer annual maintenance contracts ($150-300/year) that include two visits, priority scheduling, and discounts on repairs. These are generally worth it — especially for older systems. You'll pay less than two individual service calls, and you're more likely to actually schedule the visits.
System Lifespan by Type
Proper maintenance dramatically extends equipment life. Without maintenance, most systems fail years before their expected lifespan.
Signs It's Time
- System takes longer to reach set temperature
- Uneven heating or cooling between rooms
- Strange noises (banging, clicking, humming, squealing)
- Unusual odors when the system starts up
- Energy bills increasing without usage changes
- System short-cycling (turning on and off rapidly)
- Visible ice on the outdoor AC unit
- Weak airflow from vents
Quick Reference Table
| Service Type | When | Typical Cost | Time | |---|---|---|---| | Spring AC tune-up | March-April | $75-150 | 1-2 hours | | Fall heating tune-up | September-October | $75-150 | 1-2 hours | | Filter change (DIY) | Every 1-3 months | $5-30 | 5 minutes | | Duct cleaning | Every 3-5 years | $300-500 | 3-5 hours | | Annual maintenance contract | Year-round | $150-300/year | 2 visits |