For some reason this year my air conditioner is not producing enough
cold air to cool the upstairs of my house. When I go to the ground
floor there is enough cold air coming out, and it's nice and cold, but
upstairs, it's too hot. I try to lower the thermostat to 70 degrees,
and "cool" air comes out of the vents on the upstairs, but for some
reason, the house is not cooling down enough to make the thermostat
shut off. What's the most likely culprit?
What change has occured? If last year it worked well, and this year it's
not, perhaps there has been some change. Like a tree being trimmed? Like
the air filter is clogged and needs changing? Perhaps a refrigerant leak?
Call you friendly neighborhood HVAC repair person and have them check it
out. You'll save in the long run.
Clogged filters comes to mind, but there may be other causes. If a filter
change does not correct it, call a service tech. There are many other
possibilities and they are beyond what the average homeowner can do with
I closed the vents downstairs in hopes that the cold air would come up
to the upper floors, but this has not helped. There does seem to be
some cold air coming from the upstairs, so I'm confused as to why the
upper floors are not getting cold enough. Is it possible that the air
conditioning unit is not generating enough cold air? It seems cold
enough downstairs. How would changing the filters or opening a vent
change things. If it's generating enough cold air this should
continue until the thermostat shuts it off, right?
Do not close any vents.
A clogged air filter reduces the amount of air coming out of your vents.
You might even have some duct work that has come apart.
Call out your HVAC company to have them check your system.
Did you check the filters as many recommended? If yes, did it make a
difference? If no, do it now and if it does not fix things, call a pro.
Could also be a coil freezing up too.
Judging from your comments you don't have enough understanding of how an AC
works to do anything more than that so call the service guy. I don't mean
that in a nasty way. You may be the best computer programmer or undertaker
and nicest guy in the world, but not everyone can fix some things.
You have some things to learn about Air Conditioning Systems.
Air Conditioners don't "generate" cold air.
They remove heat from the space being conditioned and transfer it to the
In order for the evaporator to absorb the indoor heat, it requires hot air
to travel across the fins. So with a dirty filter/coil, closed off
registers, inadequate ducting, etc... it's cutting down on the capacity of
the overall system.
In order to cool the upstairs, you need adequate ducting to pull the hot air
to the evaporator, while discharging conditioned air back into that space.
Airflow is a key to an efficient/balanced running system.
The only way for this system to shut itself down is for the indoor temp to
reach the stat's set point. This can only be achieved if the unit is capable
of removing more heat from the space then it's gaining.
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