Central A/C not keeping house cool
#1
07-10-05, 06:59 PM
Central A/C not keeping house cool
I have a walkout rambler with 1000 sqf both on the main and basement levels. The basement is exposed on the east side of the house, the rest is underground. The home is in central Minnesota.
7 years ago I had a central air unit added to my gas furnace. It is either a 2 1/2 or 2 3/4 ton unit (electric).
It never really seems to have worked right from the start. First it runs all the time in hot weather. It can't keep up with the temperature changes and the interior temp rises with the exterior. It is not uncomfortable however as it is taking the mosture out of the air.
Also it runs kind of funny. Even when the thermostat is demanding cooling the compressor will sometimes cut out, but the fan on the outside unit will keep turning, then eventually the compressor will cut back in.
On the two lines from the unit one is cold and wet, but the other is not warm, it actually feels a (very) little cool.
Please let me know what you think, thanks in advance.
7 years ago I had a central air unit added to my gas furnace. It is either a 2 1/2 or 2 3/4 ton unit (electric).
It never really seems to have worked right from the start. First it runs all the time in hot weather. It can't keep up with the temperature changes and the interior temp rises with the exterior. It is not uncomfortable however as it is taking the mosture out of the air.
Also it runs kind of funny. Even when the thermostat is demanding cooling the compressor will sometimes cut out, but the fan on the outside unit will keep turning, then eventually the compressor will cut back in.
On the two lines from the unit one is cold and wet, but the other is not warm, it actually feels a (very) little cool.
Please let me know what you think, thanks in advance.
#2
07-10-05, 07:11 PM
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Small line cool
First make sure everthing (filter, indoor fan blades, & indoor coil) is clean. If all is well there, I suspect you are low on refrigerant. Checking the refrigerant requires a tech certified by EPA to handle refrigerants.
#3
07-11-05, 10:42 AM
Thanks, I'm on top of filter replacement, so I know that is good. I'll open the side and look at the coil tonight.
One more question. Doesn't a cool return line mean I don't have a good heat exchange in the furnace? Would cranking up the blower fan help? It gets very cold in the furnace room when the A/C has been running a while.
One more question. Doesn't a cool return line mean I don't have a good heat exchange in the furnace? Would cranking up the blower fan help? It gets very cold in the furnace room when the A/C has been running a while.
#4
07-11-05, 02:19 PM
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How old is the house?
How old is the furnace.. good air flow out of the vent?
2 tons is plenty for MN.. I have 2 ton on our 1200 sq ft and it's keeping temp w/ no problem.
If the compressor outside is tripping off, it maybe on a pressure switch (high or low) depends on brand.. Or it could be tripping on high temp switch on the compressor it self.
Has this compressor cycle been line this since day one?
How old is the furnace.. good air flow out of the vent?
2 tons is plenty for MN.. I have 2 ton on our 1200 sq ft and it's keeping temp w/ no problem.
If the compressor outside is tripping off, it maybe on a pressure switch (high or low) depends on brand.. Or it could be tripping on high temp switch on the compressor it self.
Has this compressor cycle been line this since day one?
#5
07-11-05, 03:42 PM
The house and furnace are 15 years old. I get good airflow out of the vents, i just wonder if it is enough.
The outside unit says "Goodman Mfg" "Houston, Texas" on it.
The compressor has been cycling like this since it was installed.
The outside unit says "Goodman Mfg" "Houston, Texas" on it.
The compressor has been cycling like this since it was installed.
#6
07-11-05, 05:36 PM
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Compressor cutting out
As far as I know, Goodman does not factory equip their equipment with either high or low pressure cut out switches. If the compressor is cycling on the internal thermal switch, they usually take about 30-60 minutes to reset themselves. I am leaning toward being low on refrigerant, but obviously that is just a guess. I suggest calling a tech to have a look at it. Check with friends, neighbors, etc. on who they use & how happy they have been with the service.
#7
07-11-05, 08:29 PM
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I agree with Grady, something is wrong with the compressor, and have someone come out and look at it..
Looks like Paul Douglas saying more 90's on the way.. We are at 7 days of 90's where last year there was 0, and 2 years ago was just 2..
Looks like Paul Douglas saying more 90's on the way.. We are at 7 days of 90's where last year there was 0, and 2 years ago was just 2..
