When you rely on your air conditioner to keep your home cool and dry, it is understandably alarming if all of a sudden it starts blowing hot air. Many times, there can be a relatively simple solution to the problem. If you do not have success troubleshooting the issue on your own then make sure to call a HVAC professional.

Troubleshooting Tips:

  • Check your ducts: Move any objects that may impede airflow, and then take your vacuum hose inside the openings to your ductwork to remove any debris. Minimize other types of strain on your AC with these tips.

Make sure your thermostat is set correctly.

  • Check the thermostat: make sure the thermostat is not set to “heat.” This switch can accidentally get bumped or flipped. Make sure your thermostat is set to “cool” and the fan settings set to “auto” and not to “on.” When your fan is set to “auto” it will only blow out cool air and not blow warm air when your air conditioner takes a break.
  • Change your filter: a dirty air filter can cause a variety of issues to your HVAC system. Regularly cleaning or replacing filters can help your system work efficiently and effectively. To learn more about how often you should change your filter, read our blog here.

Regularly cleaning or replacing filters can help your system work efficiently and effectively.

Other causes

Some other problems are difficult to diagnose yourself and will require an evaluation by a professional. These issues include refrigerant leaks, and evaporator coil or condenser malfunctions. Should you purchase a maintenance plan for your HVAC system? Read our blog here to learn more.

Is it time to replace your system?

While an AC blowing warm air is frequently resolved easily, sometimes it can be a sign that the system is reaching the end of its lifespan. Replacing your AC system might be your best option if it’s over 15 years old. Keeping an old system appears to be the best option if you are not ready or able to purchase a new system at the moment. However, it is important to remember that older systems break down more frequently, and the cost of repairs will add up over time. Additionally, newer systems are more efficient and will cut your energy costs by up to 50%!


At Genove, we understand how frustrating and uncomfortable it is to have a faulty air conditioner, especially when the hot summer weather is spiking, and that is why we are always on call to help remedy the issue. When you suspect a malfunction in your system, it is always best to have a trained professional take a look to avoid additional and unnecessary costs, as well as save time.


Having the opposite problem where your furnace is blowing cold air? Check out our previous blog here.


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If your question still needs answering or you’d like to schedule a consultation, contact the friendly team at Genove Oil & Air, and we’ll find a solution for your home or business.


Whether you need home heating oil or Bioheat delivery, or installation and service of oil & natural gas systems for HVAC, heating, and cooling—call us at 781-893-9191 or email us.