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Ongoing a/c issues

We have a system that is almost 5 years old, but it has never worked properly in heat waves. Right now it can keep up at 70 degrees setpoint with 80-85 outside. The last couple of days it could not keep up the outdoor temp was 95-98 and indoors we were 76-78 and humid...I had Sears come out to give us an estimate to upgrade the unit, but they said it is sized properly...Help!

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  • lisa flynn Jun 12, 2008

    I would be but everyone else I know in my area can get their houses down to 68-70 without feeling humid...any ideas?


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Wow! a 20 degree difference from inside to the outside? That is pretty amazing for a unit to operate that efficiently at such a high temperature. If the unit is cooling that well, it would also be dehumidifying. But at that high of an ambient which probably occurred between 4PM and 8PM, the peak heat of day, no a/c is going to do any better than that,(that I am aware of). Save your money, strip down to your skivvies, jump in your pool,have a cool drink, relax, and be thankful you have such a wonderful a/c.
If this advice works for you,please acknowledge your satisfaction by giving me your rating opinion,(and an invitation to your house when my a/c quits working above 96 degrees...LOL)

Dave E. (Illeagle)

Posted on Jun 11, 2008

  • David Emmel
    David Emmel Jun 13, 2008

    Well now, let's see here! Firstly, you provided me with NO information concerning the size or type of a/c unit, area you are trying to cool, changes in your lifestyle in the past 5 years, the region you are living in, the actual humidity percentage, etc. I gave you a solution based on refrigeration theory, that is, cooling is the result of removal of humidity and subsequently, the lowering of temperature, i.e. a vacuum. According to your statement from Sears, your current unit is sized properly. Is your house like your neighbors? Do you live like your neighbors? I think not! So, let's not compare apples to oranges or we will get nowhere!!

    Like I stated earlier, if your temperature is 20 degrees cooler than the outside, your unit is working absolutely fine. Therefore, your chief complaint would be that of the humidty level being too high.

    Now, since we have established that your a/c unit, (central air, I assume), is dropping the temperature appropriately, but not quite to your satisfaction, because of the humidity, let's refer back to the word "vacuum"! With an a/c unit of any kind, you must have a tightly sealed environment for it to work perfectly. This is sometimes an impossibility in some older homes. Newer homes are sealed more tightly to conserve energy, and thusly an a/c unit should be able to perform optimally at higher temperature and humidity levels. So, once again, not knowing the exact parameters of your existence, leaves me to believe that the Sears guy did not size your house right, (doubtful), or you have a scenario that is allowing some of that hot air and humidity to seep back into the house. This will keep your temperature a few degrees higher than your neighbors, and the humidity will also be higher because of the air leak. This will cause your a/c to work harder and be less efficient. Find the air leak, seal it off, and your problem is solved. It seems as obvious as the whiskers on my face that an air leak is your problem.

    Do some investigating and let me know what you find, I am curious to know.

    Dave E. (Illeagle)


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