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Wow, 5 ton for 1700 sf. Sounds grossly over sized. 4 ton probably was too.
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This thread is 19 years ago. ;)
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What's the make & model of the equipment? What area do you reside?
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There's hope he'll stay with the one that works or try another brand.

Nest is for Beta testers. ;)
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This is a 4th dimensional question.
;)
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Life 3,026 years from now will be either really good or really bad ...

It will be 5050 ;)
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Sounds like you're on the right track.

You likely have lots of new carpet, paint and adhesives that are curing and the home hasn't been aired out / ventilated. Environmental safety for the...

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I'm confident that temps above 62°c will cause problems for pcbs (printed circuit boards). I've seen cautions on some mfgrs replacement boards. Cooler is better. hth
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From experience...wind blown hail will come in horizontally. ;)
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Simply basackwards.... ;)
Just resting there to get a ???
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What brand thermostat is connected? ;)
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It appears you've focused on gas supply. Has anyone checked the incoming supply voltage ? Airflow into inducers?
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You can wait a while so it can generate random miscues and observe illogical operation or cut to the chase and find a decent thermostat. You and many others are Beta testing a high priced hockey ...

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YeeHaw !!
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;)

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Happy, Thanks for the follow-up.
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Sounds right. Before & After pics would be helpful. ;)
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My Fieldpiece sc66 has served very well. It's an antique but I'd buy another one today.
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I'm sure a personal CO monitor is a real good idea.
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There's a career opportunity. Hire a helper and cash their checks. ;)
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Insight & perspective speaking from experience locally:

Universities have their own Police, Fire, Engineering, Medical departments and when you're on campus, their chain of command.
Bang...

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Ah, our major university is it's own code jurisdiction authority.
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They're DIY friendly. And pretty.
:grin2:
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So, ya know what they call a man disliked by lions???

Claude.
:bump:
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Attics are/can be very hostile to people, equipment & most of the stuff people store there.

That insulation can be reattached or replaced when you call for the seasonal tune up. Just advise...

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Every other number.
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:angel:

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Nest is an example of great marketing...that is the ONLY thing it's good at.
I've seen it ruin control boards on furnaces.

If you dig into google's reviews it's average life span is poor.
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Now that's a great idea !!!
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Will this Nest be a part of the problem? Maybe....

:pop:

Sooner or later they usually are.
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X 2 ;)
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What brand of thermostat and how old is it on this system?
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Looks like you will need to call a pro.
We're unable to assist diy. Honeywell may be able or used to be anyway. Sorry.
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I suggest you let go of the middleman position. Let the HO and conttactor work directly.
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What color is the roof?
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Is there a Nest thermostat on the system ?
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A picture of the outdoor unit could be quite helpful too.
;)
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Maybe "oil canning" noise? Do you have a clean filter in the unit?
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Is this a heatpump outside?
Do you have clean filters indoors?
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It's indicates a problem. The blower motor is suffering too. Over sized blower on inadequate ductwork.... System needs to be evaluated.
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A supply blowing on a tstat is not a good thing in most cases.
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Comes in rolls of soft copper line sets from manufacturer.

https://earthlinked.com/

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With dx grid I believe Earthlink is still around .
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Any concern with radon in your area?
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Stove, grill & oven.
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Take it outside.
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The system is interactive and interlocked.

You can find a contractor or you might even call the inspector or custom stainless shop.

Our hands are tied as this is DIY....
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Kinda sounds like a wind tunnel in the making from here.
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I have customers that demand temps such as you're desiring... it is not recommended to maintain those temps in the average home. Special attention must be paid to achieve those temps reliably and...

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I have to agree with you. Though the 2 stage can be set to run in high stage only....
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Kinda like huffing after a foot race?
Maybe a indicative of several issues that would normaly be adjusted at the time of commissioning. I suggest to talk to the installers a report your...

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Looks like a pig and probably smells like one too.
Rip and replace A to Z.
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