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Old 08-30-2011, 03:16 PM
 
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In other words, if there's a less than 20 degree difference between the indoor air temperature and the cool air blowing out of the central air vent, is it time to add freon to the central air unit? In my particular situation, the difference is a measly 5 degrees.
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Old 08-30-2011, 03:24 PM
 
Location: Wexford PA / Clear Lake TX
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I've heard it said 18 degrees is the minimum. Not sure if you lack freon but it sounds like something needs to be done.
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Old 08-30-2011, 03:26 PM
 
Location: Pearland, TX
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Huh? The time to add freon is when the charge on the unit is low.

Ronnie
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Old 08-30-2011, 03:29 PM
 
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Quote:
Originally Posted by HoustonRonnie View Post
Huh? The time to add freon is when the charge on the unit is low.

Ronnie
So when do you have the charge on the unit tested?
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Old 08-30-2011, 07:45 PM
 
Location: League City
681 posts, read 1,618,732 times
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The temp at the output of the evaporator coil compared to the intake air temperature should usually be somewhere between 14-20 degrees cooler. You can't measure the temperatures at the vents and get an accurate reading since the air will most likely warm depending on the location of the vents and how well insulated they are. There are lots of issues besides low freon that can cause cooling problems. But if it is a low charge and it has worked fine in the past, then you have a leak somewhere. If you think there is a problem then all you can do is call someone to come check it out.
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Old 08-30-2011, 07:55 PM
 
Location: Cypress, TX
891 posts, read 2,515,112 times
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Quote:
Originally Posted by Zhang Fei View Post
So when do you have the charge on the unit tested?
I have my unit serviced twice a year. Once around April (before summer) and once around October (before winter). They check everything out then and add freon if needed.
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Old 08-30-2011, 08:05 PM
 
Location: Sugar Land
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Same here. I pay a company for twice a year preventive maintenance. This can save you a lot of money..... Even in my new house I still got them to do it and one of the units was low in freon. There was a leak. I called the builder HVAC company and they fixed for free.


Quote:
Originally Posted by kreeyax View Post
I have my unit serviced twice a year. Once around April (before summer) and once around October (before winter). They check everything out then and add freon if needed.
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Old 08-30-2011, 09:20 PM
 
Location: Where nothing ever grows. No rain or rivers flow, Texas
1,085 posts, read 1,274,291 times
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hmm 4.5 years now and I've never spent anything on maintaining the AC. I guess I'm not saving money
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Old 08-30-2011, 09:29 PM
 
4,247 posts, read 10,554,676 times
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If it's a new system I would think the normal air filter change is more than enough for the first 8-10 years.
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Old 08-31-2011, 07:57 AM
 
Location: Pearland, TX
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Quote:
Originally Posted by Zhang Fei View Post
So when do you have the charge on the unit tested?
Once per year, the same time you wash the condenser coils.

Ronnie
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