Diagnose & Fix 28 Common Heating and Cooling Issues
Step-by-step troubleshooting guides written by NATE-certified technicians. Each guide covers root causes, estimated repair costs, and whether you need professional help.
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Common HVAC Problems
Browse our troubleshooting guides to understand common heating and cooling issues. Each guide includes possible causes, DIY solutions, and advice on when professional help is needed.
AC Running But Not Cooling the House
Is your AC running but not cooling? Learn the most common causes and solutions. Find out when to DIY and when to call a professional.
Air Conditioner Won't Turn On
Air conditioner won't turn on? Learn the common causes from electrical issues to thermostat problems. Step-by-step troubleshooting guide.
Air Conditioner Freezing Up or Icing Over
Ice on your AC unit? Learn why air conditioners freeze up and how to fix it. Common causes include low airflow and refrigerant issues.
AC Turning On and Off Repeatedly (Short Cycling)
AC turning on and off every few minutes? Learn the causes of short cycling and how to fix it. This common problem wastes energy and stresses your system.
Air Conditioner Making Strange Noises
Banging, squealing, or grinding from your AC? Learn what different HVAC noises mean and whether they're serious. Expert troubleshooting guide.
Air Conditioner Leaking Water Inside
Water leaking from your AC inside? Learn the common causes from clogged drains to frozen coils. Quick fixes and when to call for help.
Weak Airflow from AC Vents
Little air coming from AC vents? Learn why airflow is weak and how to fix it. Common causes include filter issues and ductwork problems.
Furnace Running But Not Heating
Furnace running but blowing cold air? Learn the common causes from pilot light issues to ignitor problems. Expert troubleshooting guide.
Furnace Won't Turn On
Furnace won't start at all? Check these common causes before calling for service. From thermostat issues to safety switches.
Furnace Making Strange Noises
Banging, squealing, or rumbling from your furnace? Learn what different noises mean and whether they're serious.
Furnace Turning On and Off Frequently
Furnace cycling on and off every few minutes? Learn why this happens and how to fix it. Protect your system from damage.
Thermostat Not Working Properly
Thermostat problems? From blank displays to unresponsive controls, learn how to troubleshoot common thermostat issues.
Uneven Temperatures in Different Rooms
Some rooms too hot, others too cold? Learn why you have uneven temperatures and how to fix hot and cold spots throughout your home.
High Energy Bills from HVAC
Energy bills too high? Your HVAC system may be the culprit. Learn what causes high bills and how to reduce HVAC energy costs.
Musty or Bad Smell from HVAC System
Musty or bad smell when HVAC runs? Learn what causes odors from your heating and cooling system and how to eliminate them.
Heat Pump Not Heating in Winter
Heat pump blowing cold air in winter? Learn why your heat pump isn't heating and when the auxiliary heat should kick in.
Heat Pump Frozen or Iced Over
Heat pump covered in ice? Learn why heat pumps freeze up and how to safely defrost them. When ice is normal and when it's a problem.
Heat Pump Not Cooling in Summer
Heat pump running but not cooling? Learn the common causes and solutions for heat pumps that won't provide cold air in summer.
AC Running But Humidity Still High
Air conditioner running but house still humid? Learn why your AC isn't dehumidifying properly and how to fix sticky, uncomfortable air.
Bad Smell from Air Conditioner
Musty, burning, or rotten smell from AC? Learn what different air conditioner odors mean and how to eliminate them.
Air Conditioner Keeps Tripping Breaker
AC keeps tripping the circuit breaker? Learn what causes this common problem and whether it's safe to keep resetting.
Poor Indoor Air Quality
Experiencing allergies, dust, or stuffy air at home? Learn how to improve indoor air quality and the role your HVAC system plays.
HVAC Making Allergies Worse
Does your HVAC make allergies worse? Learn how your heating and cooling system affects allergies and what you can do about it.
Noisy Ductwork - Popping, Banging, Whistling
Ducts making popping, banging, or whistling sounds? Learn what causes ductwork noise and how to quiet your HVAC system.
Leaky Ductwork Wasting Energy
Leaky ductwork can waste 20-30% of heating and cooling. Learn the signs of duct leaks and how sealing saves money and improves comfort.
Pilot Light Keeps Going Out
Furnace pilot light won't stay lit? Learn why pilot lights go out and whether to relight it yourself or call for service.
No Heat Reaching Upstairs or Certain Rooms
Upper floors or certain rooms not heating? Learn why heat doesn't reach all areas of your home and how to fix cold spots.
Professional Repair Services
When DIY troubleshooting isn't enough, our certified technicians are ready to help.
Can't Find Your Problem?
If you're experiencing an HVAC issue not listed here, or if you've tried troubleshooting and still need help, our expert technicians are ready to diagnose and fix the problem.