01:24PM | 10/25/00
Member Since: 10/24/00
2 lifetime posts
Is it possible to increase the capacity of an air coniditioner at a modest cost?? The house is 1.5 stories (1500 sq ft downstairs and 1000 upstairs) and I have two systems rated at I believe 3 tons each. When talking to a service man he mentioned that most houses are designed in my area (Austin, TX) at 95 F. If you watched the news, we hit 60-70 days above 100 and peaked at 112 last summer. Neither system can keep up and are continuously running. The coolant is at spec and they operate fine.

The service tech did say the upstairs unit is running a high pressure and the evaporator will need to be replaced in the next year or two ($800 - $1000 cost).

Any comments, thoughts, suggestions appreciated.


05:57PM | 10/25/00
Member Since: 02/19/00
206 lifetime posts
The only problem is that the highest rating is 90 or 95*, but this is the max. perameters of a given A/C unit. I know it is hot, but the hi temp days are not how the a/c is sized. If you had too much A/c at normal temps, you would drop the temp but not humidity. Don't expect to get 75* when it's 100+_ outside. It's unrealistic.


06:16AM | 10/26/00
Member Since: 10/24/00
2 lifetime posts
Sorry, but I did not give enough info.

I am not looking for 75 or lower. I am looking just to hit 78. On days above 100, the temperature in the house can climb to 84 F (with the A/Cs never shutting off). This is too warm and uncomfortable. The house is less than 7 years old and I do not think the design is correct.


01:19AM | 10/27/00
Member Since: 02/19/00
206 lifetime posts
O.K.,...looking into your problen further I found that probable tonnage needed is 3 ton for down and 2 ton for up. you have 3 and 3 I believe. Operation is critical on any A/C unit especially when it's hot. Unfortunatly, some service teh's. do not know what the hell they are looking at. If the head pressure was hi on one unit, there is a problem and it should be fixed. I would try to get a least one more opinion as to the proper operation of your equipment.
Note,.. the tonnage I gave you is based on an educated guess not an actual geat gain of the house....


03:59AM | 10/27/00
Member Since: 03/13/00
1675 lifetime posts
There are some other things you can do to help your AC units. Have you checked the insulation in your attic? Have you considered a power attic ventilator? (These can be very valuable.) Are your windows double glazed, low E glass? Awnings? etc., etc., etc.


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