Summer in Durham, NC means high temperatures and heavy AC use. The last thing you want is for your system to fail when you need it most. Luckily, your air conditioner usually gives you warning signs before a breakdown happens — if you know what to look for. In this post, we’ll cover 10 common signs that your AC needs maintenance, how to prevent major issues, and what to expect from a professional tune-up.
Need AC maintenance in Durham? Book your tune-up with Hays HVAC and enjoy peace of mind all summer long.
Why Regular AC Maintenance Matters
Annual AC maintenance isn’t just a good idea — it’s essential. Here’s why:
- Helps prevent surprise breakdowns during hot weather
- Improves energy efficiency and reduces utility bills
- Extends the lifespan of your HVAC system
- May be required to keep your manufacturer warranty valid
10 Signs It’s Time for an AC Tune-Up
1. Warm Air Coming from the Vents
If your AC is blowing warm or room-temperature air, you may have an issue with refrigerant, airflow, or your thermostat.
2. Weak or Inconsistent Airflow
Limited airflow can indicate clogged filters, duct blockages, or failing blower motors — all of which need attention.
3. Unexplained Spike in Energy Bills
If your usage hasn’t changed but your bill has, your system might be struggling with efficiency. Maintenance helps optimize performance.
4. Strange Noises During Operation
Grinding, rattling, buzzing, or clicking sounds are often signs of loose or failing components that need inspection before bigger issues occur.
5. Musty or Burning Odors
Foul smells could mean mold growth in the ducts or overheating components. Don’t ignore unusual odors — they’re never a good sign.
6. Thermostat Isn’t Accurate
If the temperature on your thermostat doesn’t match how your home feels, it may need recalibration or replacement.
7. System Is Short-Cycling
Frequent on/off cycling can indicate dirty coils, low refrigerant, or sensor issues — all fixable with a proper tune-up.
8. Ice on the Coils or Outdoor Unit
Ice is a sign of airflow problems or refrigerant issues. It also reduces cooling power and can lead to system damage.
9. High Humidity Indoors
Your AC should remove humidity. If it’s not, you may need a tune-up or system upgrade to improve dehumidification.
10. It’s Been Over a Year Since Your Last Service
Even if you don’t notice any symptoms, regular maintenance is recommended annually. A small issue today could be a major repair tomorrow.
What’s Included in a Professional AC Tune-Up?
- Clean or replace air filters
- Inspect and clean evaporator and condenser coils
- Check refrigerant levels and pressures
- Test electrical components and connections
- Calibrate the thermostat
- Lubricate moving parts
- Ensure proper airflow and temperature output
Related: Seasonal HVAC Maintenance Checklist
Homeowner AC Maintenance Tips
- Change your air filter every 30–60 days
- Keep the area around your outdoor unit clean and clear
- Check for blocked vents or closed registers inside the home
- Inspect thermostat batteries and settings seasonally
Book Your AC Maintenance with Hays HVAC Today
Don’t wait for your AC to fail. At Hays Heating and Air Conditioning, we’ve been serving Durham homeowners for over 20 years. Our experienced technicians offer fast, affordable maintenance that helps you stay comfortable and avoid costly repairs
Call us at (919) 471-8020 or schedule your AC tune-up online today.
