Why Is My AC Running but Not Heating? Power Supply Issues & HVAC Solutions

Ever found yourself shivering in your own home, wondering why your AC is running but not heating? It’s a frustrating situation that many of us have faced. Picture this: the thermostat is set to a toasty temperature, yet the chilly air persists. But fret not, dear reader, for we’ve got your back! In this article, we’ll unravel the mystery behind your AC’s cold demeanor and guide you towards a cozy solution. Stay tuned to discover the secrets that will have you basking in warmth once more.

Common Reasons for AC Running but Not Heating

If your AC is running but not heating, several factors could be causing this issue. Here are some common reasons to consider:

  • Thermostat Settings: Incorrect thermostat settings may prevent your AC from heating properly. Check if the thermostat is set to the desired temperature.
  • Dirty Air Filters: Dirty air filters can restrict airflow and impact the heating capacity of your AC. Regularly changing or cleaning filters is essential.
  • Faulty Heating Elements: Malfunctioning heating elements could be the culprit behind your AC not heating correctly. A professional inspection may be necessary.
  • Refrigerant Issues: Low refrigerant levels or leaks can hinder the heating process. Contact HVAC professionals to address refrigerant-related problems.
  • Electrical Problems: Faulty wiring or electrical issues might be affecting the heating function of your AC. Ensure all connections are secure and undamaged.

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Understanding these common reasons can help you troubleshoot and address the issue of your AC running but not heating effectively.

Check the Thermostat Settings

When your AC is running but not heating, the first step is to Check the Thermostat Settings. Here’s what you need to do:

  • Ensure the thermostat is set to heat mode.
  • Double-check the temperature setting to be higher than the current room temperature.
  • Verify that the fan setting is on auto or on, depending on your preference.
  • If your thermostat is programmable, review the schedule to rule out any conflicts.

By reviewing and adjusting the thermostat settings, you can potentially resolve the issue of your AC running without producing heat.

Inspect the Air Filter

When your AC is running but not heating, a common culprit could be a dirty air filter. A clogged filter can block proper airflow, hindering the heating process.

To address this issue, locate the air filter in your AC system. It’s typically found near the return air duct or blower compartment.

  • Check the filter for dirt, dust, or debris buildup.
  • If the filter looks dirty or clogged, it’s time to replace it with a new one.
  • Refer to your AC’s manual for guidance on the correct filter type and replacement procedures.
  • Regularly changing your air filter, typically every 1-3 months, can improve heating efficiency and overall AC performance.

By inspecting and replacing your air filter as needed, you can help maintain optimal airflow and ensure that your AC functions effectively in heating your home.

Check for Power Supply Issues

If your air conditioner is running but not heating, it’s crucial to Check for Power Supply Issues. Here’s what you can do:

  • Inspect the circuit breaker to ensure it hasn’t tripped.
  • Look for blown fuses in the electrical panel.
  • Verify that the AC unit is receiving power by checking the power switch.

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If you’re experiencing power supply problems, addressing them promptly can help restore heating functionality to your air conditioning system.

Professional Help: When to Call an HVAC Technician

If you’ve checked the power supply and your AC is still running but not heating, it might be time to call in a professional HVAC technician. Here are some signs that indicate you should seek professional help:

  • No Experience: If you’re not familiar with HVAC systems and how they work, it’s best to leave the troubleshooting to the experts.
  • Strange Noises: Unusual sounds coming from your AC unit could signify a mechanical issue that requires professional attention.
  • Recurring Problem: If you’ve repeatedly tried to fix the issue but the problem keeps coming back, it’s time to bring in a professional to address the root cause.
  • Safety Concerns: Issues related to electrical components or refrigerant leaks can pose safety hazards. Calling a professional ensures these issues are handled safely.

Remember, HVAC technicians have the knowledge and tools to diagnose and repair a wide range of issues with your air conditioning system. Don’t hesitate to reach out for professional help when needed.


If your AC is running but not heating, remember to first check power supply issues like the circuit breaker, fuses, and power switch. Seeking help from an HVAC technician is crucial, especially if you lack experience or face safety concerns. HVAC technicians have the expertise to diagnose and resolve a range of air conditioning system problems efficiently. Trust their skills to ensure your AC functions optimally and keeps your home comfortable.

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Frequently Asked Questions

What should I do if my air conditioner is not heating?

If your air conditioner is not heating, check the circuit breaker, fuses, and power switch. If the issue continues, seek help from an HVAC technician, especially if you lack expertise, hear unusual noises, face repeated problems, or encounter safety concerns.

Why is it important to seek professional help for air conditioner issues?

It is essential to seek professional help from an HVAC technician for air conditioner issues because they have the expertise to diagnose and resolve various system problems effectively.

What kind of problems can HVAC technicians address?

HVAC technicians can address a wide range of air conditioning system issues, ensuring proper diagnosis and resolution of problems efficiently.

Charlie Thomson is Appliance Mastery's expert on laundry appliances. With a degree in mechanical engineering and over 8 years of experience in the appliance repair industry, Charlie is a go-to resource for homeowners who want to tackle common issues with their washing machines, dryers, and dishwashers.

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