Why Is My Central Air Not Blowing Cold Air?

6 Reasons You May Have Lost your Cool—and How to Fix Them

central air Caroline County, CT Summer can be gorgeous in Fairfield County—until the humidity kicks in. If your air conditioning system isn’t doing the job, the season can go from blissful to miserable. Casey can help! A regular tune-up is the best way to ensure your central air conditioning system runs trouble-free all season. But if you have a problem, our techs will be ready to make repairs and get you quickly back to cool and comfortable.

The most common call we get is customers saying their AC isn’t blowing cold air. There can be a lot of reasons for this—and some are easily fixed without a service call. Here’s a helpful troubleshooting guide you can use this summer.

6 Reasons You’re Getting Hot Air

  1. Dirty coils: If the air is blowing, but it’s not cool, it could be due to dirty coils. An central air conditioner has a set of indoor coils that absorb heat from your home’s air, and a set of outdoor coils that transfer that heat to the outdoors. If either of these coils get dirty, it becomes harder for heat to transfer between the coils and the air that’s blown over them, making it much harder for the system to remove heat from your home—and the air that comes out of your vents will be warmer than it should be. We’ll clean your coils as part of annual maintenance, but you can do it yourself, if you feel comfortable. You need to make sure the AC is off, then remove the cover and use a soft brush to gently loosen dirt and debris. Apply coil cleaner, rinse coils, and then leave cover off to dry.
  2. Blocked condenser unit: Condenser units can become blocked by bushes and shrubbery, as well as by fallen branches, leaves, and other lawn debris. If your condenser unit is obstructed, it can’t release heat from the condenser coils effectively, and the heat that’s removed from your home will not be released properly. Periodically check to be sure the area around the condenser unit is clear, and trim back plantings.
  3. Dirty filter: Are you noticing a theme? Blocked and dirty equipment leads to poor performance. When your air filter is dirty, it restricts the amount of air that can blow over your evaporator coils. When this happens, much of the warm air that your central air conditioner is pulling in will not actually be cooled. Clean or replace the filter at least once a season—more often if you have pets that shed.
  4. Compressor problems: Your air conditioner’s compressor is one of the most important components of your cooling system. It keeps the refrigerant at optimal pressure, and without it, your system would not be able to absorb heat from inside your home and transfer it outside. If your compressor is malfunctioning, you’ll need to call a pro.
  5. Refrigerant leak: If the air flowing from your vents is warm, check for ice crystals on your AC’s evaporator coils, it’s a sure sign of a refrigerant leak. Miniscule leaks are not unusual, and our technicians check for and repair them when they do seasonal maintenance. A leak resulting in in warm air and ice crystals indicates a bigger problem and we need to check it out.
  6. Thermostat settings: Sometimes the problem is this simple: If the fan setting on your thermostat is set to “on,” your air handler will blow air even when your system isn’t in a cooling cycle. That means some of the air coming out of your vents will feel warm. The solution is to switch the fan setting to “auto.” You can also check whether your system is in “heat” or “cool” mode. Your air conditioner will only be turned on if your thermostat is set to “cool.”

Have a Plan

Most of these problems are easy to handle, either with regular maintenance or some DIY fixes. But for those times when you can’t troubleshoot it yourself, it’s smart to have a plan—as in a service plan. Our Central Air Conditioning Service Agreement includes a spring tune-up, which means small problems get taken care of before they can become expensive breakdowns. And when bigger problems occur, our plan offers savings on repairs.

Now’s the time to schedule your seasonal maintenance: contact us today for an appointment and more information.