Your HVAC system is supposed to keep you comfortable, not give you headaches. If your heater isn’t heating, your AC isn’t cooling, or weird noises are keeping you up at night, you’ve got a problem. Here’s how to spot the signs of HVAC trouble early and what you can do to avoid expensive repairs down the road.
7 Signs You Need HVAC Repair
Your HVAC system doesn’t just stop working overnight. It usually gives off warning signs first. Catching these early can save you from expensive repairs or a total system failure. Here’s what to look out for:
1. Weak Airflow
Turn on your heater or AC, but barely feel any air coming out? That’s a problem. Weak airflow can be caused by clogged air filters, leaky ductwork, or a failing blower motor. It might start as a minor annoyance, but if ignored, your system will have to work harder, leading to higher energy bills and potential breakdowns.
2. Strange Noises
Your HVAC system should hum along quietly, not sound like a drumline or a haunted house. Banging, rattling, or clanking could mean loose or broken parts. Squealing often signals a belt issue, while hissing might indicate a refrigerant leak. If you hear a sudden loud boom when the furnace kicks on, it could be a gas ignition problem. Bottom line? Weird noises = time to call a pro.
3. Inconsistent Temperatures
If one room feels like the Arctic and another like a sauna, your HVAC system isn’t distributing air properly. This could be due to thermostat issues, ductwork problems, or a struggling compressor. The fix might be as simple as recalibrating your thermostat or it could mean your system is aging and struggling to keep up.
4. Unexplained Energy Bill Spikes
Not using more heat or AC than usual but still seeing a sky-high energy bill? Your HVAC could be overworking itself due to dirty filters, failing parts, or duct leaks. The harder your system has to work, the more energy it burns, and the more you pay.
5. Bad Smells or Musty Odors
HVAC smells can tell you a lot.
- Burning smell? It’s usually an electrical issue or overheating parts.
- Musty or moldy odor? There could be moisture buildup in your ducts, leading to mold growth.
- Rotten egg smell? If you have a gas furnace, this could mean a gas leak. Turn it off immediately and call a professional.
6. Short Cycling (Turning On & Off Too Often)
If your system kicks on and off repeatedly within a few minutes, that’s short cycling. Possible causes include a faulty thermostat, refrigerant issues, or even an oversized unit. This not only reduces efficiency but also puts excessive wear and tear on your HVAC, shortening its lifespan.
7. No Heat or Cool Air
If your system is on but not heating in winter or cooling in summer, something’s wrong. It could be low refrigerant, a bad compressor, or a faulty heating element. In some cases, it’s a simple fix like replacing a dirty filter, but if your system is older, it might be time to consider a replacement.
Basic HVAC Troubleshooting: How to Repair Heating and Air Conditioning
Before calling an HVAC professional, try these basic troubleshooting steps. Many common heating and cooling issues can be resolved with simple checks and minor adjustments.
1. Check the Thermostat Settings
- Make sure the thermostat is set to heat during winter and cool during summer.
- If the thermostat is battery-operated, replace the batteries.
- Adjust the temperature by a few degrees and listen for the system to turn on.
2. Inspect the Air Filter
- A clogged air filter can restrict airflow, reducing efficiency and causing overheating.
- Check the filter and replace it if it appears dirty (filters should typically be changed every 1–3 months).
3. Examine the Circuit Breaker
- If the HVAC system is not turning on, check the electrical panel for a tripped breaker.
- Reset the breaker if necessary, but if it continues to trip, there may be an underlying electrical issue requiring professional attention.
4. Ensure Vents and Registers Are Open
- Blocked or closed vents can disrupt airflow and cause uneven heating or cooling.
- Check that all vents are open and unobstructed by furniture, curtains, or rugs.
5. Inspect the Outdoor Unit (For AC Systems)
- Leaves, dirt, or debris can accumulate around the condenser unit, restricting airflow.
- Gently remove any obstructions and clean the area around the unit.
6. Listen for Unusual Noises
- Banging or rattling may indicate loose components.
- Hissing could suggest a refrigerant leak.
- Buzzing or clicking may point to an electrical issue.
- If unusual sounds persist, turn off the system and contact an HVAC technician.
7. Reset the System
- In some cases, resetting the HVAC system can resolve minor issues.
- Turn off the thermostat and power down the unit at the circuit breaker.
- Wait one to two minutes before restoring power and restarting the system.
When to Call an HVAC Professional
If the HVAC system still does not function properly after troubleshooting, professional repair may be necessary. Issues such as refrigerant leaks, faulty compressors, damaged electrical components, or malfunctioning heating elements require expert diagnosis and repair.
How Much Does HVAC Repair Cost?
On average, HVAC repairs range from $150 to $600, but complex issues can cost over $2,000. The exact price depends on the issue that needs to be repaired, system age, type of HVAC system, labor costs, and parts availability.
Is It Worth Repairing or Replacing Your HVAC?
If your HVAC system is over 10–15 years old and the repair cost is more than half the price of a new system, replacement might be a better long-term investment. Newer systems are more energy-efficient and come with warranties that cover repairs.
Need an HVAC Professional in Olympia, WA?
Your HVAC won’t fix itself and waiting could mean bigger (and pricier) problems. If your system is acting up, let our expert technicians at Sunset Air take care of it. Fast service, honest pricing, and repairs done right the first time.
Need urgent help? Our 24/7 emergency service is here when you need it most. We also service water heaters and duct systems and offer HVAC maintenance plans to keep your system running efficiently for years to come. Serving Olympia, Lacey, Tumwater, Yelm, Shelton, and Centralia. Call 360-565-5890 today.
Frequently Asked Questions
How often should I get HVAC maintenance?
At least once a year before summer for AC and before winter for heating. Regular tune-ups improve efficiency and prevent breakdowns.
How long does an HVAC system last?
Most systems last 10–15 years with proper maintenance. Frequent repairs may signal it’s time for a replacement.
Why is my energy bill suddenly higher?
Likely causes: dirty filters, leaky ducts, or failing components. If your system is old, it may be time for an upgrade.
Does Sunset Air offer emergency repairs?
Yes. 24/7 emergency HVAC services are available. Call 360-565-5890 for immediate assistance.
