How Often Should You Maintain Your Air Conditioner?
A central air conditioner or heat pump in a southern New Hampshire home should be professionally serviced once a year, ideally in the spring before the first hot day. A heat pump that heats and cools year-round does best with two visits (spring and fall). Regular service helps catch wear, drainage problems, airflow restrictions, and electrical issues before the hottest weather. Warranty requirements vary by manufacturer and model, so follow the written warranty and owner's manual and keep service records.
When to schedule
The right window is late March through May, before the cooling season begins. Demand is light, scheduling is flexible, and anything we find can be fixed before you need cooling. Many homeowners pair the spring AC tune-up with a fall heating tune-up as part of their annual maintenance.
What a complete AC tune-up includes
A proper annual service covers a long checklist. The high-impact items:
Outdoor condenser
- Rinse the condenser coil and clear debris (leaves, cottonwood, grass clippings) from the cabinet
- Inspect the fan motor and blade for damage or wobble
- Tighten electrical connections and test the capacitor for proper microfarad rating
- Inspect the contactor and replace if pitted or sticking
- Verify proper clearance around the unit (two feet minimum)
Indoor air handler or furnace coil
- Replace the air filter and clean the evaporator coil and blower wheel if needed
- Clear the condensate drain line and confirm the safety switch and secondary drain pan work
Refrigerant and performance
- Check operating temperatures, airflow, controls, and equipment data for signs of a performance problem. Refrigerant-circuit testing is performed when operating symptoms indicate it is needed.
- Check suction and discharge line temperatures
- Measure supply-air and return-air temperatures and verify static pressure across the indoor coil
- Compare supply and return conditions with the equipment, indoor humidity, airflow, and manufacturer guidance. One fixed temperature difference does not diagnose every system.
Controls and thermostat
- Test thermostat operation and proper system staging (single-stage, two-stage, variable-speed)
- For heat pumps: verify reversing valve operation and defrost cycle
- Update smart thermostat settings if needed
Why annual service pays off
A capacitor that tests weak in May can be addressed before it becomes a no-cool call during the hottest weather. Restricted airflow, dirty heat-transfer surfaces, and failing components can increase runtime and operating cost. The effect varies by system and condition, so the value of maintenance is catching and correcting the actual problem.
Heat pump and mini split notes
Heat pumps run year-round and take more weather abuse, so annual service should also inspect the defrost control and sensor, confirm the outdoor unit drains its defrost water, verify the installed model's intake, discharge, base, drainage, and snow-clearance requirements, and (on dual-fuel installs) check that the changeover temperature is set correctly.
Ductless mini splits need clean reusable filters, open airflow, clear drainage, clean coils and blower components, intact line-set insulation, and a stable outdoor-unit mounting. Filter and deep-cleaning intervals depend on pets, smoke, dust, use, and what the equipment looks like during inspection. Because these systems are critically charged, we do not connect gauges simply to perform a routine annual "charge check." We open the refrigerant circuit only when system performance points to a refrigerant problem.
What homeowners can do between visits
- Change or check the filter monthly
- Rinse the outdoor coil gently with a garden hose mid-season after disconnecting power
- Keep shrubs, grass, leaves, and debris back from the outdoor unit
- For heat pumps: keep snow clear from the outdoor unit in winter
Schedule a tune-up
If your AC or heat pump has not been serviced in over a year, or you want to get on a regular maintenance schedule, contact A.J. LeBlanc Heating or call 603-623-0412. Serving New Hampshire families since 1928.
Frequently Asked Questions
How often should I service my central AC?
We recommend annual cooling-system maintenance for many homes, with additional seasonal attention for equipment that provides both heating and cooling. The appropriate schedule depends on runtime, environment, equipment, and manufacturer instructions.
Is annual maintenance required for the warranty?
Maintenance requirements vary by manufacturer, model, and warranty. Follow the written warranty and owner's manual and keep your service records. Regular maintenance also supports reliable operation and helps catch problems early.
What is the best time of year to schedule AC service?
Late March through May, before the first hot day. Schedules fill up fastest after the first 90°F forecast.
Can I do AC maintenance myself?
Some tasks (filter changes, gentle coil rinsing, clearing debris around the outdoor unit) yes. Refrigerant checks, electrical work, and capacitor testing require a licensed technician with EPA certification and proper instruments.
How long does a tune-up take?
A complete tune-up typically takes 45 minutes to 90 minutes depending on system complexity, accessibility, and what is found during the inspection.