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Why does the top aircon work and not the bottom?

The home I live in has 2 aircons, 1 up stairs in the main bedroom and downstairs. The one upstairs blows cold but the one downstair doesnt, they both run on the same engine. When I turned the d/s aircon on it gave a popping noise and shut off all the electricity in the house... do you have any idea what could be the problem

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You have a short in the system,you will need to have someone that can trace the wiring,come take a look.Most AC techs can do this,but you may need an electrician.



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Posted on Feb 01, 2009

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Why can't I lower my honeywell 8500 below 67 on cool?


With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
So your solutions are
1-- fit controls that restrict the cold air from leaving the upper floor (Doors)
2--don't run the upper ac unit unless you are living up there (waste of money
)3 place an ac in each upper room and keep the room door closed

Aug 12, 2014 | Air Conditioners

1 Answer

We have 2 units (upstairs and downstairs) the upper unit no longer cools, we've had several calls done and a coil was replaced, issue persists and it will not cool below 85 degrees. The downstairs unit...


Check the supply air tempeture and the retun air temp.. to do this you put a termitor where the air come out and take the temp. then you check the air at the return where it goes back to the blower. you shoudl see a 15-20 degree diffrence. the oterh thing MIGHT be that cold air is heavier than warm air so it sinks down stairs. close off all the rooms upstairs might help .

Jul 18, 2011 | Air Conditioners

1 Answer

I moved into a place that has a MasterCool Evaporative Cooler on the roof. The ownstairs is quite comfortable so I really only need to cool the 2nd story.... it seems as if all the cold air settles...


jbrown - Hot air rises, Cold air falls. If you have ceiling fans upstairs, turn them on to run counterclockwise at highest speed you can stand. Make sure all the windows are closed upstairs. The ceiling fans will help to keep the cool air upstairs and pull some from downstairs.

If you don't have ceiling fans, invest in a box type fan that you can place at the head of the stairs (that's the top of the stairs) run it on HIGH and it will act like an exhaust fan, by pulling cool air upstairs. It may take a while, but it will help cool the upstairs to some degree.

Hope this helped you. Please let me know. Thanks.

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1 Answer

Zone cooling not delivering adequate air to both zones simultaneo


You need to have someone evaluate the ductwork for the home. With all zones calling, there should be an even balance of airflow. And when only one zone is calling, there should not be the tornado effect you describe.

The dampers feeding each zone may be of the wrong size. It also sounds as though you are also having a problem with your bypass damper. This damper is designed to bypass excess air when only one zone is calling. It is operated typically off the airflow alone.

Have it check out. You definitely have a problem. I would recommend getting it looked at by a company other than the installing company to remove any bias judgment or diagnosis.

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My air conditioning vent downstairs is leaking water


it happens when aircondition is run for cooling and evaporator is frozen of ice. if you turn off aircon ice will defprost from evaporator.

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1 Answer

Heat on bottom floor no heat on top floor


pretty vague, but i'll give it a shot. i assume that your upper and lower floors are heated by the same unit. of course if your not sure you better check to see if there is a second t stat for up stairs in case there is a second unit that heats it. there may also be a zoning system that seals off upstairs ducts unless the zone stat for that area is calling for heat. so look for a second stat upstairs if you think it may be zoned. now to you original question. lets assume the unit is not zoned and only one unit heats both. then you may have a mechanical damper in the ductwork ,usually located close to the indoor blower that shifts to force more air upstairs in summer and more air downstairs in winter, these can usually be shifted as needed to control air to upper lower and are usually marked upstairs dornstairs etc. if you have no dampers etc, then you have reason to suspect the ductwork has come apart or been crushed before it gets upstairs. you'll have to go up or under the house etc and try to find duct problems.good luck

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