Summertime HVAC Troubleshooting: Why is my A/C Blowing Warm Air?

It’s no fun going without proper cooling during the summer months in the Bay Area. Fortunately, air conditioning units are pretty reliable for a number of years, providing your home with refreshing cooled air to keep you and your loved ones comfortable. But sometimes, things go wrong, and one of the most common concerns people may ask about is why their A/C unit is blowing warm air.

If you’d like an overview of reasons why your unit might be blowing warm air before you call in an HVAC professional, then we’ve got you covered. Here we outline some of the most common reasons that your A/C may be blowing warm air, rather than cold air.

The Thermostat is Set to “Heat” or “On”

It sounds obvious, but oftentimes homeowners will wonder about the air coming from their vents being warm, without checking the temperature setting on their thermostat. Do this first before anything else. You may have accidentally set your system to have the heating unit kick-on, in which case, it’s probably working just as it should be. It also could be set to the “on” function, which will cause the system to blow uncooled air while the outdoor unit isn’t running.

Refrigerant Leak

Refrigerant acts as a cooling agent in A/C systems by absorbing heat from the air, which in turn provides you with “conditioned” air. If your refrigerant gets low, that means there is a leak. Check your outdoor unit for a frozen refrigerant line, or for any unusual noises. If it’s making a hissing noise, then the leak is probably pretty major. If you notice these signs coming from your A/C unit, then it’s time to call in a professional to find and repair the leak as well as replace the lost refrigerant.

Restricted Air Flow

If you haven’t replaced your HVAC air filter in a long time, or, if you haven’t had maintenance performed on your A/C system this year, then you could be dealing with restricted air flow. This type of issue can result in too little air coming from the vents, which can seem as though the unit is blowing warm air. Improper air flow can also cause other major issues for your home’s cooling system, which could cause your outdoor unit’s compressor to stop functioning.

Faulty Ductwork

A less common cause of an A/C unit blowing warm air is a faulty return duct, which could be either disconnected or broken. If this happens, then the return duct is pulling in air from either the outdoors, or from a warm attic space. If this is your issue, you’ll need to call in a professional HVAC technician.

Need Professional Help? Call us Today!

Aside from your thermostat being improperly set, if you notice any of the above issues with your A/C unit, then you’ll want to seek the help of a certified HVAC professional.

ACS Air Conditioning Systems has been helping Bay Area residents with their cooling needs for over 40 years, offering professional service to satisfied customers. Call us today to schedule an appointment with one of our highly skilled technicians: (925) 270-1613.

Debunking Indoor Air Quality Myths


Poor Indoor Air Quality (IAQ) can lead to the development of various medical conditions if not fixed early enough. Throat and eye irritation, dryness and allergies are just some of the most common conditions caused by poor air quality. Your air can be harboring many pollutants that can cause different health issues and you’ll need to be careful when installing devices meant to curb these pollutants. This article discusses IAQ myths, and we hope this information will help you make an informed decision when installing gas detectors in your home or office.

Installing Permanent Gas Detectors is the Best Idea

True — Gas detectors, as the name suggests, are devices meant to identify gasses in your air and get rid of them before they pose a threat to your health. It is therefore recommended that you perform regular maintenance procedures to ensure your gas detectors are up to date and that any parts that need repairing or replaced are taken care of on time.

It’s Not Necessary for you to Replace Sensors that are Already in the Field.

For more information please see:

Stay Comfortable With These Summer Cooling Tips

When the temperature starts to rise outside, many want to feel the temperature go up inside of their homes. Finding relief from the heat is important, especially for older people, young children, and those with certain health conditions. These helpful summer cooling tips will keep your costs low and your home comfortable throughout the warmer months.

Air conditioners have a filter that needs to be cleaned and changed several times a year. When the filter is clean, it circulates fresh air through the home, and it allows the AC to run more efficiently. An old or dirty filter will cause the unit to be overworked, and it also means that dirty air will continue to stay inside and be recirculated. Check the filter, and be sure to change it at the start of the season.

Another one of the more popular house cooling tips is to keep heat out by covering windows and glass doors. Use blinds to control the flow of natural sunlight into rooms. Curtains and blinds can be kept closed when the sun is high. Consider installing white blinds, which reflects the heat from the home. Sunlight can quickly warm up a room. Use blinds to block it out, and turn on fans to maximize coolness inside.

One of the most common tips to stay cool in summer is to use fans. Installing ceiling fans makes it easy to circulate air throughout a room. A window or tabletop fan will bring in any breezes from the outdoors when the AC is off, and when it’s on, it will help circulate the cooler air. Fans provide one of the most effective and affordable ways to beat the heat.

Finally, be sure to schedule a maintenance inspection for your home’s AC unit. One of the best cooling tips for your home is to have a skilled technician check your HVAC system to ensure that it runs optimally all summer long. It will save you money on cooling costs and keep your air conditioner in good shape. Summer is the perfect time to have your HVAC system inspected and tuned up.