Central air unit staying on?

Glitter7 · #1 Jul 14, 2006, 04:12 PM

I've noticed over the past two weeks that our central air unit is staying on most of the day. We have it set at 75 and have it on AUTO. Now I know when it hits 76 that its suppose to kick on.. and kick off at 74 right?? Well the problem is that it will run for about 6 hours during the day and not drop down 1 degree at all. Its blowing out really cold air though. But as it starts to get cooler outside then the tempature starts to drop in the house and the Central Air will turn off. It works fine in the morning turning on and off like its supposed too.. and works fine at night time... but its just during the hottest part of the day when it wants to stay on and not turn off..... We had someone come out and he cleaned out the unit outside and told us that was the problem because it was so dirty.. We live in Oklahoma so its really hot and humid during the summer time... but I don't remember it staying on all day long last summer.. I remember it kicking on and off all the time not just at night time or in the morning time... So like we have it set at 75.. It will go all the way up to 77 and stay on for that about 6 hours and then when it starts to get cooler outside it will start to drop and turn off at 74. Frustrated PLEASE HELP!!!

shunned · Jul 14, 2006, 11:16 PM

It sounds like the AC is struggling against the sun to keep your place cool. If nothing significant has changed (windows left open, trees trimmed to allow the sunlight to hit the house) I can't think of anything mechanical that could be malfunctioning, as it seems to work well in the morning and evening.

Glitter7 · Jul 15, 2006, 06:12 AM

Thats what my husband told me. He said if there was something wrong with it.. it wouldn't work during the morning or at night time. Our unit on the outside is positioned on the worst side of the house when its the hottest outside!! I just noticed that we are using alot more electric this summer then we did last summer. Like 3-600 more kilowatts a month. It is hotter and more humid this summer though I guess...

Is it normal for it to run for 6 hours and not even drop 1 degree at all??? It does this during the hottest part of the day... but when its cooler out like in the morning and at night time.. it runs fine. It runs for probably 10-15 minutes and cools off the house and shuts off.. and then comes back on in about 30-45 minutes later when the tempature rose in the house.

shunned · Jul 15, 2006, 08:18 PM

Maybe your condensor is dirty and is working harder? Have you had it cleaned this season yet?

As an idea to help the condensor: you might consider planting a hedge around the condensor to shade it from the sun. At least a foot or two away from the unit, but close enough to shade it.

SuperTyphoon · Jul 15, 2006, 08:22 PM

Is your thermostat a LuxPro? Mine is, and it works teh same way. The unit turns on at 1 degree higher and shuts off at 1 degree lower.

The reason why is becasue the unit is not powerful enough to cool the house when it's hot out. What i recommend is that you set it to a bit warmer, like 77, because 74 is hard to get during the day for any house. Mine only goes to 76 in the day when it's hot, because I have a huge sliding glass door that lets in a lot of heat in the living room.

Glitter7 · Jul 16, 2006, 01:26 PM

I set it up to 76.. and its doing the same thing. My uncle who is a heat and air guy is coming over today to hopefully figure out what the problem is.. or if there even is one I should say!! I am wondering if what I consider cool air.. is really cool? or if its not cold enough??

We did have our outside unit cleaned about 2 weeks ago. It was pretty dirty.

SuperTyphoon · Jul 16, 2006, 02:56 PM

Chances are there is nothing wrong, it's just that the way the house was built, it lets in too much heat or is not sealed enough. Windows let in ridiculous amounts of heat as well.

It if goes to 76 in the day, consider it working fine.

Glitter7 · Jul 16, 2006, 06:25 PM

Ok well my uncle came out and took a look at it. He said the only problem he can see with it is when he put his pressure gages on the outside unit. One of the gages went to 400 and some... he said there looks like there could be a restriction somewhere in the line. He hasn't done this stuff in a while so he said hes gonna go home and read his books and stuff to see what it could be... but it blows out cold air.. he said our airflow in the house and stuff is good. He also didn't have his electric meter or whatever with him so he couldn't test that stuff... but just from the pressures he said we have a problem. Our line also didn't have any filters on it?? If there is a restriction in the line.. any ideas on how much it would cost to get it fixed???

He said he really don't think its the compressor because obvioulsy its blowing really cold air....

SuperTyphoon · Jul 16, 2006, 06:58 PM

Something is really wrong if the compressor is blowing out really cold air...

Glitter7 · Jul 17, 2006, 04:21 AM

Well I didn't mean really cold air... I just mean that its blowing out cool air like it should be... the air is not warm!!!



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