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Key:
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Global Mod,
Mod
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Joined: Jan 2010
Posts: 4,374 Likes: 10
10 point
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10 point
Joined: Jan 2010
Posts: 4,374 Likes: 10 |
What would yall check.
Parents bought Lennox three years ago. Flawless first two years.
This summer it will not get cold. Power bill doubles or more.
Well the ac man we trust and have used for thirty years installed and
Keeps saying all the numbers are in the parameters. He’s been out two times.
Coming again Monday.
The inlet temp is 78 and the vent temps are 73-75 depending on the vent.
He says it’s the attic temp. Maybe during day. But at night it will not get below 76/77. Runs all night.
If all parameters are good. And not getting cold. What is it.
Sucking from attic ? I’ve looked and can’t find anything is about the only thing I can think.
Nothing ventured, nothing gained.
My phone screen does not always work right, usually a lot of misspelled words....
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Joined: Aug 2014
Posts: 22,815 Likes: 197
Impatient Stinky Britches Wearin’ Off-Roadin’ Guru
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Impatient Stinky Britches Wearin’ Off-Roadin’ Guru
Joined: Aug 2014
Posts: 22,815 Likes: 197 |
I'd get a 2nd opinion and have someone else look at it....I've always "heard" that output at the vent should be 20-25 lower than intake....so if it's taking in 78 at the return, it should at least be spitting out air around 60ish, give or take.
Isaiah 5:20
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Joined: Oct 2012
Posts: 12,134 Likes: 41
Booner
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Booner
Joined: Oct 2012
Posts: 12,134 Likes: 41 |
You might have a duct that has.become unattached in The attic
Does the unit have a Thermal expansion valve? I had a problem with mine and the TXV made it act very similar
Well, the way I see it is there's just too many assholes
On a good day there's a bunch of assholes in here.
On a bad day there's too many assholes in here.
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1 member likes this:
YellaLineHunter |
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Joined: Feb 2013
Posts: 8,618 Likes: 20
14 point
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14 point
Joined: Feb 2013
Posts: 8,618 Likes: 20 |
Could be a number of things. But if your A/C guy thinks everything is fine with a 3-5 degree deltaT, he's either incompetent or a liar. Call someone else.
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1 member likes this:
YellaLineHunter |
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Joined: Jan 2010
Posts: 4,374 Likes: 10
10 point
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10 point
Joined: Jan 2010
Posts: 4,374 Likes: 10 |
Let me rephrase. After his second time coming out. We didn’t know this.
We started doing our own homework with the temps. That’s why we called him back to come
And see what he thinks again.
It’s should be at the bare minimum 15 degrees temp drop he said. But should’ve be 18-22 he said.
Nothing ventured, nothing gained.
My phone screen does not always work right, usually a lot of misspelled words....
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Joined: Dec 2011
Posts: 1,781 Likes: 3
8 point
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8 point
Joined: Dec 2011
Posts: 1,781 Likes: 3 |
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Joined: Mar 2005
Posts: 7,157 Likes: 16
14 point
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14 point
Joined: Mar 2005
Posts: 7,157 Likes: 16 |
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Joined: Apr 2000
Posts: 19,233 Likes: 27
Old Mossy Horns
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Old Mossy Horns
Joined: Apr 2000
Posts: 19,233 Likes: 27 |
Did he see if the outside unit need cleaning or if the inside needed cleaning .
If it ain't getting air through those coils it won't cool right
I guess he checked it to see if it had enough freon in it.
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Joined: Jul 2020
Posts: 3,478 Likes: 24
10 point
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10 point
Joined: Jul 2020
Posts: 3,478 Likes: 24 |
Delta t needs to be 16 at a minimum. The lower the supply vs return the better your cooling efficiency. Txv would be my first guess if nothing has changed other than not keeping up. They probably didn’t use nitrogen when they soldered the joints and that soot has been trapped in n the txv causing it to stick. Bet the super heat and sub cooling are way off but “ pressures aren’t bad”
Last edited by YellaLineHunter; 08/14/26 10:16 PM.
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Joined: Oct 2013
Posts: 3,168 Likes: 6
10 point
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10 point
Joined: Oct 2013
Posts: 3,168 Likes: 6 |
Watch shows like Holmes on homes using thermal detector. Get a second opinion or home inspection. Lived in an old homes years ago that leaked terrible around large picture window. Drafts can be anywhere. A good home inspector may be needed regardless of ac issue, save $$$$.
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