Why is my air conditioner not blowing cool air?


It’s hot Kansas City. Yes, we’re stating the obvious, but that doesn’t change the fact that it’s hot, getting hotter, and going to stay hot. This is summer in Kansas City, and we’ve all grown to accept and love it. Now what are some essential ingredients to a successful summer here in Kansas City? Barbeque, sunscreen, and the Royals winning games are some pretty good answers. Here at Polestar we have another answer for you: consistently cool A/C. However, during the summer month’s one of the most common searches on Google is “why is my air conditioner not blowing cold air.” This problem has potential to wreak havoc on your summer, as well as being a potentially pricy problem for you. We wanted to give you some possible answers as to why you’re A/C could not be blowing cold air, and hopefully help you out a before it becomes a major issue.

A good place to start is with a simple description of how you’re A/C probably works. Many people probably just think that the A/C blows cold air into the home and that’s the whole process; however, the purpose of the air conditioning unit is to actually remove the heat and humidity from your home. This is done through a repetitive process that can be described as follows: your downstairs unit blows the hot air inside your home across your evaporator unit. Your evaporator coil then absorbs the hot air inside your home, where it then transfer the heat to your outdoor unit, where the heat is then dissipated outdoors, then the cycle begins again.

Things you can do before calling an HVAC technician:

  1. Check the settings on your thermostat – It sounds simple, but make sure your thermostat is set to “cool.” Also, make sure your fan setting is set to “auto” and not “on”, as when it’s set to on you’re A/C will blow air even if it’s not cooled yet.
  2. Check your air filter – Check to see if your air filter is dirty, and if it is change the dirty filter with a new one and judge the results before calling a technician. Dirty air filters block airflow to the air handler, causing difficulties with the airflow. Clean air filters also ensure that your coil doesn’t freeze, which could be a very expensive issue for you.
  3. Check the outside A/C unit – Make sure your unit isn’t covered in dirt, dust, or grass. Make sure no branches or shrubbery is blocking your unit. The condenser coil can become blocked by tall weeds, grass or other airborne debris. These can cause your outside unit to have to work harder because it can’t remove the heat from your condenser coil.

If you tried all of the above, and cool air is still not flowing into your home, it may be because of the following reasons:

  1. Electrical issues - Potential electrical issues include a malfunctioning thermostat or a bad run capacitator. Signs of a bad run capacitor include: bloating (it being pushed out), rust, or leaking. Also, an issue could be a bad contactor. This could be because the contactor has corroded points. These problems should be diagnosed by a professional. You can check the service switches though to ensure they’re turned on. These are commonly found on your inside unit.
  2. Low on refrigerant – If your system is out of refrigerant it cannot remove the heat from the air, so the air being circulated inside your home is uncooled. Refrigerant does not deplete or go bad over time, so if you’re low on it then it probably means there’s a leak in your unit. A seasoned professional should be able to diagnose this issue quickly, then repair the leak.
  3. These are some common reasons we have seen through our years of experience in the field when we get no A/C calls. Hopefully this blog can help answer some questions for you. If push comes to shove though, and you’re A/C does need to be looked at by a certified HVAC technician, we’d love to help you out. Call us at (913) 432-3342 and we’ll get a technician out to your place as quickly as we can. Stay cool out there this summer Kansas City!

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