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Central Air Conditioning

For some reason, the air conditioning upstairs in my 2 story home is not blowing cool air throughout. In the past, one of the rooms upstairs was extremely cold. however, the rest of the rooms upstairs remain hot. We keep trying to turn down, but it will not cool off the upstairs. With it turn down to 60 degrees, the temperature upstairs is still 86 degrees. What could be wrong the air. The once cold room is cold no longer. No matter how low we turn the air conditioner down, it does cool off upstairs. I need help. Let me know your thoughts.

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  • dcdon Sep 03, 2008

    I can not feel air coming out of any of the vents upstairs at all. The current temperature upstairs is 84 degrees. However, the little air frost emblem continues to indicate that the air conditioning is on. However, there is no air coming out of any of the vents in the rooms.

    As for the downstairs which is a little cooler, the temperature is turned down to 71, however, the gauge indicate that the downstair temperature is 74. Let me know your thoughts.

  • dcdon Sep 03, 2008

    I have a fan switch on the thermostat that is we always keep on auto. Should I switch it to on? If so, should I be listening for something to happen? The fan switch has always been set on automatic. What is the fresh air intake and where would it be located?

  • dcdon Sep 03, 2008

    I think it may be the fan. I turned the fan switch to on and nothing happen upstairs. I located the the fresh air intake for both downstairs and upstairs. The downstairs was sucking air because the filter blowing up up in the vent when I opened. The filter was very dirty and I changed the filter. As for the upstairs, I switch to the fan to "on" but did not hear it come on yet. I changed the air filter upstairs as well.

    Should the fan have come on as soon as I switched to on or should there be a delay? If not, I think I have a fan problem with the upstairs unit which is the smaller unit outside of my house. Are air conditioning fans costly? Will that be a part? if so, I have a 5 year warranty on all parts for my new home.

    Again, I look forward to hearing back from you.

  • dcdon Sep 03, 2008

    Great!!! I will call the manufacturer on tomorrow. Is the air conditioning fan different for the upstairs and downstairs? The downstairs is blowing at full blast.

    I will have it looked at in the morning. Again, thanks.

  • Amanda Drew
    Amanda Drew Aug 23, 2017

    That's strange that your AC isn't cooling your upstairs anymore especially that it won't cool down the room that was always cold. Mine has recently been doing something similar in that it sounds like it's working, but my home is still hot. I think that we both will just have to find someone to come out and repair our units.



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Also make sure there are no blockages in the Vents. We had a remodel job and there was material stuffed in the vents which they forgot to take out.

Posted on Aug 23, 2017

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It sounds like a restriction in your ducting. Feel the A/C vents in the hot rooms to see if cold air is blowing out of them. If the ducts are restricted, then it is possible that the air conditioning coils are freezing up from lack of circulation. Inspect the ducts if you can to see if there is any restriction.

Note that even if you feel air coming out of the ducts, it could be ambient as opposed to cold. The best thing is to measure the air temperature coming out of the ducts. It should be around 20 degrees colder than the ambient air at the intake of the A/C.

Posted on Sep 03, 2008

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  • Steve Froese
    Steve Froese Sep 03, 2008

    From what you have said, I would say either the fan is not functioning, or the main duct coming out of the A/C unit is plugged. I would venture a guess that there is a problem with the fan. The indicator on your thermostat will probably not be able to tell whether your fan is actually running, but will only light if the thermostat is telling the A/C to come on. See if there is a breaker or switch for the fan, otherwise the motor may be burnt out. Also, find your fresh air intake and see if you can tell whether air is being sucked into it.

  • Steve Froese
    Steve Froese Sep 03, 2008

    Yes, change the fan switch to "on" and see if you get air blowing out of any of the ducts. If not, then the fan is not working.

    I don't know where the air intake is, but it will probably have a grille perhaps with a filter. Don't confuse it with the furnace air intake.

  • Steve Froese
    Steve Froese Sep 03, 2008

    If you turn the fan switch to "on", the fan will come on immediately.

    Blower motors are certainly cheaper to replace than compressors :), but I don't know how much they are. Contact the manufacturer or local dealer. If it is under warranty, let them deal with the whole thing, it won't cost you a dime. If it is not under warranty and it is just the blower (as opposed to a wiring problem), then you may be able to replace it yourself. Sounds like it's still under warranty though

  • Steve Froese
    Steve Froese Sep 03, 2008

    You hinted that one A/C unit was smaller than the other one, so they are likely to have different parts. They may even be different manufacturers. At any rate, write down the make, model, and serial number of the upstairs unit so you have the information handy when you phone. This information is sometimes hard to find. The serial number is probably a sticker somewhere on the unit, but it may be under the cover. If you can't find the information, just call the manufacturer and tell them that and they will walk you through finding it

    good luck!

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The lack of air flow upstairs could be due to closed or blocked registers.

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How a Central Air Conditioning System Works

  • The typical central air conditioning system is a split system, with an outdoor air conditioning, or "compressor bearing unit" and an indoor coil, which is usually installed on top of the furnace in the home.
  • Using electricity as its power source, the compressor pumps refrigerant through the system to gather heat and moisture from indoors and remove it from the home.
  • Heat and moisture are removed from the home when warm air from inside the home is blown over the cooled indoor coil. The heat in the air transfers to the coil, thereby "cooling" the air.
  • The heat that has transferred to the coil is then "pumped" to the exterior of the home, while the cooled air is pumped back inside, helping to maintain a comfortable indoor temperature.
  • Central air conditioning can also be provided through a package unit or a heat pump.

  • Indoor comfort during warm weather - Central air conditioning helps keep your home cool and reduces humidity levels.
  • Cleaner air - As your central air conditioning system draws air out of various rooms in the house through return air ducts, the air is pulled through an air filter, which removes airborne particles such as dust and lint. Sophisticated filters may remove microscopic pollutants, as well. The filtered air is then routed to air supply ductwork that carries it back to rooms.
  • Quieter operation - Because the compressor bearing unit is located outside the home, the indoor noise level from its operation is much lower than that of a free-standing air conditioning unit.


Sep 10, 2008 | Amana Heating & Cooling


Keeping your whole home cool with central air.

Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.

If your living space is a single floor plan:

  1. Turn the air conditioning on
  2. Switch the furnace fan from auto to on.
  3. Measure the temperature in each room.
  4. Close the vents by about half in the cooler rooms
  5. This will force more cool air into the warmer rooms.
  6. Keep adjusting the vents until all the rooms have the same temp.

If your living space is on more than one level:

  1. Turn on the air conditioning.
  2. Switch the furnace fan from auto to on.
  3. On the lowest level of the house close half of the vents that are the closest to the stairs.
  4. This will force more cool air to the top floor where it is usually hotter.
  5. Cool air will sink from the upper floors which will keep the area near the stairs cool.
  6. Measure the temperature in all the rooms.
  7. Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.

Take Care,


on Aug 09, 2010 | Heating & Cooling


Ductless Split Air Conditioner Review

Ductless split air conditioning units are the very best thing for some situations. Of course they can be installed in the place of most any central air conditioning unit. They also are a very good alternative to window air conditioning units. I will explore the use of these units more closely and look at how they can be used effectively.
One of the many problems encountered by the professional is when they are asked to install central air conditioning in an older home that was never designed with air conditioning as even a possibility. The walls may be very thick stone. Often they have very little or no insulation. The floor structures may be rough cut lumber. The joists spacing may be random. Walls and ceilings are plaster and lathe. Basically everything is stacked against any type of ducted central air conditioning. Many log style homes also are not very easy to get any kind of ducted central air conditioning installed. The open ceilings and the bare log wall design does not allow for any kind of ducting. I'm sure there are other situations. These are the ones that I have come across most frequently.
If you have a home or building that falls into one of these categories you may want to investigate installing a ductless air conditioner. This type of air conditioner can be installed in almost any home or building. The small indoor unit can be attached to the wall with a few screws. Most of the units only require that a three inch hole be bored through the outside wall. In new installations the units can be placed on inside walls with some fore thought and planning. For installation in older homes or homes that are already built you will want to plan the units to be on the outside walls.
The outdoor condenser units can be placed up to one hundred feet away from the indoor units. One outdoor unit can be used for many indoor units. Up to four indoor units can be attached to the same outdoor condenser. Some very advanced electronics will control the operation of the condenser and compressor to supply the refrigerant to the indoor air handler units that are running at the time. With variable speed technology the compressor and the condenser fan will only run as fast as needed. This technology has become very efficient in the last few years. You do not have to give up any efficiency with these ductless split units.
Another advantage to these mini split air conditioners is that they can be controlled to run only in the rooms that you actually need air conditioning in. If you are not going to be in a room you can shut down the unit. The units also have timers that can be set to turn the air conditioning on or off at preset times. If you are not going to be home all day the air conditioning can be setback or turned off. The timer will turn on the air conditioning so that you return to a cool house. Central air conditioning is very hard to zone effectively. Also with large central air conditioning systems the outdoor compressor will be running at full capacity even though only a few rooms amy be calling for cooling. There are some central air conditioning systems that are do some staging and variable speed technology. These are not as efficient or as effective as the ductless split technology.
Ductless split heatpumps are another great idea to look at. For a few dollars more you can also very easily have heat from your air conditioning mini split. Then especially in the mild spring and fall weather you can have some very efficient heat with out starting up that big monster of a furnace or boiler in the basement. In southern climates the heatpump version of the ductless split system may provide enough heat year around.
Ductless split air conditioning is definitely something that can solve many problems for some homeowners. Add to that the many advantages of these units and you will find that they are worth every penny that you will invest into them. As with any project like this make sure that you screen your contractor. These units are not for do it yourself people. There are many things that need to be done correctly for these units to work properly and efficiently. A refrigeration license is also required to install these air conditioners.
By doing a little research and hiring the right person you will enjoy many years of trouble free service from your new ductless mini split system.

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My A/C blowing air, but it is not cool. It has started freezing up. We just replaced the air filters and since then it is freezing up. We even gently cleaned the a/c coils before replacing the filters. ...

Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

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I'm looking to purchase a Rudd 2 stage model, 16 SEER, 5 ton along with a 100000 BTU 95% furnace. I have a two story home and will only be using the 1 AC. Will the Rudd cool both floors?

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I f it is fan that has more then one speed if you run it all the time,it may
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Some of this depends on where the air handler/furnace is located. Most often in two story houses, it's in the attic upstairs, or in a closet upstairs. A duct routes air from the furnace to the downstairs supply duct, so it is a distance from the air handler.
When the unit first initiates a heating cycle, that duct is going to be full of cool air, and the duct itself will be cool. So the furnace has to run long enough to push the cool air out, as well as warm the duct up, before your going to feel warm air at the registers downstairs.

Keep in mind, heat rises. And, your thermostat only monitors the immediate area where it's located. In your case, upstairs.
Two story houses are problematic because of this. And one way around it is to have a damper system installed that distributes the air upstairs or downstairs based on a thermostat located in those spaces. There would be 2 dampers, and 2 thermostats (one upstairs, one downstairs). Each stat would control a damper, and the call for heat or cooling.

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