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    What to do if Your AC is Not Blowing Cold Air

    You expect your AC to work when you need it, but what do you do if your AC is not blowing cold air? Find out why your AC may break down and how to fix it.

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    JULY 31, 2019

    Few things are worse than a malfunctioning air conditioning system in the sweltering summer heat. There are a few ways to troubleshoot your HVAC system if your AC is not blowing cold air. Of course, it’s always wise to contact an HVAC professional for service and repairs. Identifying the potential root cause of the problem and communicating any findings to your contractor helps. This information enables better preparation for repairing your unit quickly. Plus, address any problems as soon as possible. Why? Because a broken air conditioning unit is not only an inconvenience, but possibly a major health concern if temperatures soar.



    There are some relatively common reasons your AC may have stopped working, including:

    Power issues Thermostat issues Clogged filter Ice buildup Clogged drain Dirty compressor

    Condensate airflow switch

    Low refrigerant levels

    There is hope. Fixing some issues on your own remains an option. Plus, most are easily repaired by a qualified HVAC technician.

    Power issues

    It might sound basic but if your AC is not blowing air, check to ensure that it’s plugged into the outlet correctly, and that the power cord is still intact. If the outlet and cord are fine, it could be an issue with your electrical panel. Air conditioners require large surges of power, and your unit might have blown a fuse or tripped a breaker. Some units have overload switches built-in, so make sure you check this as well.

    Thermostat issues

    If all looks good on the power front and your AC is still not blowing cold air, it could be that the thermostat on your unit isn’t set at an appropriate temperature. Try turning the dial down all the way, or pushing the buttons to the lowest setting and see if that trips the unit to run. If you’re able to, check to ensure all wiring into the thermostat unit (and any batteries, if applicable) are connected properly.

    Clogged filter

    Some AC units have a built-in mechanism that shuts the unit down if the filter is clogged. This is to prevent damage to the motor and overheating. It could also be that the filter is so clogged that it’s not allowing for adequate airflow. Check your unit’s filter and clean or replace it if necessary.

    Ice buildup

    There are a couple of reasons for ice buildup in your AC — dirty coils or filters resulting in poor airflow, or a lack of refrigerant. Try cleaning your air conditioner’s filter and the coils to see if improving the airflow fixes the problem. If there is ice buildup, you’ll need to run the unit with just the fan in order to melt it off. If that doesn’t get the unit blowing cold air again, it could be refrigerant levels are low (see below).

    Clogged drain

    Air conditioners remove moisture from the air, with the water typically draining out a hose or drain pipe which can become clogged with algae, ultimately causing the unit to shut down. This is an important safety feature that prevents water from backing up into your home or the unit and causing damages. The piping can sometimes be replaced, but can also be cleaned with a mild bleach solution.

    Dirty compressor

    Part of your regular maintenance should be cleaning the area around your compressor and covering it for the winter. Over the year, leaves, dirt, and other debris can build up and stop the unit from running properly. While some homeowners handle compressor cleaning, enlist professional help for the best results. This ensures your unit receives proper cleaning and the appropriate maintenance. Always ensure the unit is shut off before beginning any work.

    Condensate airflow switch

    Some air handlers contain an integrated safety float switch that trips and shuts off the unit when the drain pipe backs up with water. If you check and find that the switch has tripped, it must be reset after the condenser drainpipe has been cleaned.

    Low refrigerant levels

    Contrary to popular belief, coolant doesn’t go bad or deplete; a common reason for a lack of cold air is often a refrigerant leak. Slow leaks can cause refrigerant levels to drop over time, which requires a check of the lines, and a recharge of the system in order to get it blowing cold air again. This should be done by a professional due to the complex nature of cooling systems and the chemicals involved.

    Depending on the age of your unit and the level of work involved, consider updating your system. For example, upgrading to a new system makes sense for a more reliable model. An upgrade makes a wise investment in certain circumstances, such as:

    systems older than 10+ years old.

    consistently experiencing recurring problems.

    fixes that cost more than you’re comfortable paying.

    As with all things in life, the old adage “an ounce of prevention is worth a pound of cure” is true when it comes to your air condition system as well. By having a professional technician perform annual inspections and staying on top of any maintenance issues, you can help to avoid any potential AC outages.

    Source : solvitnow.com

    AC Not Blowing Cold Air: 5 Reasons Why This is Happening

    AC not blowing cold air? This is the last thing you need when it's hot outside. Read on to learn what to do to fix the problem and get your AC running again.

    AC Not Blowing Cold Air: 5 Reasons Why This is Happening

    Is your AC not blowing cold air? The last thing you want to do is wake up or come home and discover your air conditioner is not working properly. Not only is this very uncomfortable, but it can also result in health risks to you, your family and any pets you may have in the home.

    As soon as you notice there is a problem, you should take action immediately. Do not wait until the heat becomes unbearable. When in doubt, always contact an professional for an HVAC service call.

    There are several reasons that can cause your HVAC unit to stop the circulation of cold air. Some are simple and can be taken care of immediately, while others require the help of an expert.

    Here are some things to look for with your AC not blowing cold air and how to fix the issue.

    How Does a Central AC System Work?

    In order to better understand what may cause your AC to not work properly, it will help to know how it works.

    Your air conditioning unit uses a liquid refrigerant. This liquid passes over the indoor evaporator coils to absorb the heat inside your home. Absorbing the heat transforms this liquid into an icy gas. The AC unit’s fan blows across those refrigerant-cooled coils and pushes cold air through the duct work out to circulate into the home.

    The gas-form of the refrigerant carries the heat back to the outdoor condensing unit where it transforms into a liquid after releasing the heat to the outdoor air.  This cycle repeats over and over to cool your home. With so many steps, there are several things that can cause a problem.

    Let’s take a look at the top 5.

    1. Leaking or Low Refrigerant

    The refrigerant, mostly commonly Puron or R410A, is the chemical that puts the whole process in motion.

    If your central AC is not blowing cold air, the refrigerant may be the problem. The unit could be running low and need additional refrigerant added.

    The most likely cause of this is a leak. A leak not only keeps the AC unit from cooling properly, but also it can cause other issues within the home. For example, when it isn’t cool enough, humidity levels can rise in your home making it feel hotter than it is inside.

    If you suspect a refrigerant leak, you should contact an HVAC professional right away. Unless the leak is large, it can be tricky to diagnose and fix these properly.

    2. The Filter Is Dirty or Clogged

    Another common problem with AC units are filters that are dirty or clogged. All year long, these filters work overtime trapping hair, lint, dust, and pollen. It doesn’t take long for them to become full if they are not changed regularly.

    When this happens, the air cannot flow correctly into the home and your AC unit may shut off because it can’t get enough air. Without the air conditioner working properly, the inside temperature soars. Left that way too long, clogged filters can also cause parts to wear out faster than they should. It can even affect the evaporator coil and condenser and create a much larger problem.

    In addition to routine cleaning, the filters should be changed every three months. If you have indoor pets, you may need to change it more often.

    You should be able to replace indoor air filters easily yourself.  However, if you are unsure of the correct filter to use, an AC technician can help.

    3. There Is a Problem With the Evaporator Coil or Condenser

    The filters mentioned above do their best to keep the coils clean and operating at peak performance, however, even the coils will wear out over time.

    Because of the constant moisture, your indoor evaporator coil can be prone to problems with mildew and even mold. (UV lights can guard against this and keep your air cleaner.) Coils can also freeze up if the refrigerant is running low within the system.

    Issues with the coils will cause major disruption within the air conditioning unit and should be seen by an HVAC professional as soon as possible.

    The condenser can also wear out over time. When your air conditioner is not blowing cold air and no other reason is found, have this checked as well.

    4. Blocked or Clogged Registers

    Just like air filters that are clogged and restrict airflow, a blocked or clogged register (or vent) can do the same thing. A return air register takes air into the system, and supply vents blow conditioned air into the house. Clogs in either cause problems.

    The ventilation system runs throughout the house and if something creates a blockage or a leak in the ductwork, it will affect the cooling. A tear or hole in the ductwork could mean your cold air may be leaking out of your attic. Rodents like mice or rats that take up residence in your attic can do a number on ductwork and create leaks that affect how your system cools.

    When something is restricting air near the vent itself, only the room with that vent may feel warmer than the rest of the house. That is a good indication there may be a ventilation problem in the ducts that supply conditioned air around your home or office.

    It is also worth noting that occasionally a vent will get closed by accident. If just one room if particularly warm, check to make sure the supply vent is fully open.

    There will eventually come a time when your HVAC unit is costing more and more to repair. When that happens, it may be time to consider replacing your system.

    Source : terrysacandheating.com

    Air Conditioner Not Cooling? Try These 6 DIY Fixes

    Learn the most common causes of an air conditioner not cooling, and easy ways to troubleshoot the problems yourself. Here's how to...

    Major Systems

    Solved! What to Do If Your Air Conditioner is Not Cooling Your Space

    Solved! What to Do If Your Air Conditioner is Not Cooling Your Space Don’t sweat it if your central air conditioning won't blow cold air. Learn the most common causes of an AC that won't cool, and easy ways to troubleshoot the problems yourself.

    By Theresa Clement and Bob Vila | Updated Jan 24, 2022 11:29 AM


    Q: I’ve just turned on the air conditioner for the summer, but I just can’t get get comfortable. The appliance circulates air, but it is not blowing cold air. Why is my air conditioner not cooling? More important, how can I fix it?

    A: It’s the last thing you want on a sweltering summer’s day—a central air conditioner not blowing cold air. While your first reaction may be to contact an HVAC pro, with a little of your own troubleshooting, you might remedy the problem and save on a costly house call.

    Air conditioning systems operate on a basic scientific process called “phase conversion.”

    Refrigerant, the liquid used in an AC system, undergoes a continuous cycle of evaporation and condensation within the unit’s sealed coil system.

    The unit’s evaporative coils (usually located inside your home near a blower unit) become icy cold as the refrigerant within turns from a liquid to a gas.

    The unit’s fan blows air over those icy coils, which forces cooled air through your home’s ducting.

    The gas then cycles back to a condenser coil unit (located outside) where it cools back down to a liquid and the cycle repeats itself over and over.

    If your AC system is blowing warm air, several culprits may be to blame. The following are a few things to check when your air conditioner is not cooling your space.


    Check and reset the thermostat.

    It may seem simple, but sometimes when an air conditioner is working but not cooling it is simply the result of someone switching the thermostat from “Automatic” to “Fan.”

    When the switch is set to “Automatic,” the thermostat switches on the air conditioning when the indoor temperature rises above the desired preset temperature. If the switch was accidentally set to “Fan,” the unit will blow air through the duct system, but no cooling will take place.

    Easy DIY Fix: Check and reset the switch from “Fan” to “Automatic.”

    Replace the dirty filter.

    If it’s been more than a couple of months since you’ve replaced the return-air filters in your AC system, they may be clogged, dirty, and affecting air flow. When filters get clogged with animal fur and dust, the AC system can’t draw in sufficient air, and as a result, only a wimpy flow of air comes out.

    Easy DIY Fix: Remove the return-air filter and, if you can’t see what’s on the other side, replace it. If you can see through the filter, your problem with your AC not cooling lies elsewhere.

    It might be time to call a pro

    Get free, no-commitment repair estimates from licensed HVAC technicians near you.



    Clear the clogged condensation drain.

    Air conditioners work in part by removing humidity from the air (through condensation), and that moisture must go somewhere. The job of a condensation drain hose is to direct water to a floor drain or to the outside of your home, depending on your system. Condensation drains are subject to blockage by mold and algae growth. When this happens, some AC won’t blow cold air while others will shut down completely.

    Easy DIY Fix: Locate the end of the condensation drain line (it’s often in a utility room) and visually inspect it for clogs. If you see a clog, carefully clear it out with the end of a small screwdriver or similar narrow item.


    If a clog forms higher in the line where you can’t physically reach it, suctioning on the end of the line will usually remove it. Use the hose on a wet/dry shop-type vacuum—and hold your hands around the opening—to create sufficient suction between the two hoses.

    After removing a mold or algae clog, pour a couple of cups of white vinegar into the condensation pan that lies beneath the evaporator coils in the inside blower unit (learn how to access and identify the coils and the condensation pan below). The vinegar will kill residual mold buildup and reduce the risk of future clogs.

    Try to diagnose duct malfunctions.

    In a central AC system, the main blower forces cold air through the ducting and into individual rooms. If a duct somewhere between the blower and a room register (the grill that covers the opening of an HVAC duct) has broken, the cold air could be blowing out before it reaches the room’s register. If cool air is blowing from some registers but not from others, there’s a good chance the ducting that feeds the registers is at fault.

    Easy DIY Fix: If you have an unfinished basement, you can examine the ductwork to see if a joint has come loose. If so, refit the ends of the joint and tape the new joint securely with duct tape. If a ducting joint has come loose within a finished wall, however, you won’t be able to easily locate it and will need to call an HVAC professional.

    Source : www.bobvila.com

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