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Thirdeye 07-14-2007 02:27 AM

AC efficiency poor
 
The central ac in my house (1500 sq ft tri-level) takes about and hour to pull the house temp down 4 degrees from 80 to 76 at night. That doesnt seem too efficient to me.

Whats my first course of action here? There has to be some freon for it to be cooling at all (the house had been at 80 for awhile so I know it was the ac that brought it down). Is there an easy way to determine if the problem is low freon charge? Or RG 58 or whatever it is they use for refrigerant.

Sammy 07-14-2007 06:27 PM

The first step would be to have a qualified a/c tech check it out.

The temp drop time you are describing is not unrealistic.

Keep in mind the walls, furniture, etc. need to come down to the new temps and that takes time.

MechanicalDVR 07-15-2007 11:50 AM

Quote:

Originally Posted by Sammy (Post 52920)
The first step would be to have a qualified a/c tech check it out.

The temp drop time you are describing is not unrealistic.

Keep in mind the walls, furniture, etc. need to come down to the new temps and that takes time.

Amen, have a pro check it out the first time, there are many things that are beyond an average DIYer when it comes to mechanicals.

harleyrider 07-15-2007 05:28 PM

Quote:

Originally Posted by Thirdeye (Post 52880)
The central ac in my house (1500 sq ft tri-level) takes about and hour to pull the house temp down 4 degrees from 80 to 76 at night. That doesnt seem too efficient to me.

Whats my first course of action here? There has to be some freon for it to be cooling at all (the house had been at 80 for awhile so I know it was the ac that brought it down). Is there an easy way to determine if the problem is low freon charge? Or RG 58 or whatever it is they use for refrigerant.


Thats pretty damn fast if you ask me............whats your suction pressure and head pressure, what is the superheat value?saturation tempature? are you condensing? these all must be answered to help you.

bigpappageorgio 07-19-2007 01:04 PM

Im dealing with the same problem. I live in columbus ohio, where all the homes are built by mexicans, and have had nothing but problems with my maronda home. :furious:

Last saturday it was 86 outside, we went out and had left the windows open, when we got home it was 84 in the house. So we close all the windows, turn on the a/c, which i keep on 76. It was 3pm when I turned it on, and buy 9pm it was only down to 80.

HVAC guy came yesterday, air coming out of blower is 50 degrees, coming out of vent in living room was 66 degrees. He also said one of my 2 registers in my 25x17 living room was blowing 13cfm and the other was 20cfm.

bigMikeB 07-19-2007 06:09 PM

Quote:

Originally Posted by Thirdeye (Post 52880)
The central ac in my house (1500 sq ft tri-level) takes about and hour to pull the house temp down 4 degrees from 80 to 76 at night. That doesnt seem too efficient to me.

Whats my first course of action here? There has to be some freon for it to be cooling at all (the house had been at 80 for awhile so I know it was the ac that brought it down). Is there an easy way to determine if the problem is low freon charge? Or RG 58 or whatever it is they use for refrigerant.


That time sounds good to me, why let the house go to 80 during the day?


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