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Hello,

Is there any online service etc who can do hvac design for my house?

I want to get install done by someone who does not do the design. Also, I want design to be done right.

How much does it usually cost for 3000 Sq. Ft house for design. I live in central NJ.

Thanks,
DJ
 

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Hello,

Is there any online service etc who can do hvac design for my house?

I want to get install done by someone who does not do the design. Also, I want design to be done right.

How much does it usually cost for 3000 Sq. Ft house for design. I live in central NJ.

Thanks,
DJ
You looking at about tree fiddy per SF give or take a few grand...
 

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My reservation would be congruent to Bill Parcels statement "if I am going to cook three dinner,I buy the groceries. If the system does not work to expectations, who its going to be responsible?
I'm new but this caught my eye. The OP said the installer he would like (I assume if the installer can buy the equipment, he is a licensed contractor dealing with heating and cooling) doesn't do the design. So what's wrong with getting a separate design?

I'm asking because I had contacted a member of the ACCA that works as a consultant to the industry. From what I am reading here it would seem that you assume every installer is capable of designing the most efficient system for the situation.

Can everyone who installs be that good?

From talking to those that have given me an estimate (2), I already see that this science is not exact.

And, to the OP, even though this is an old thread, my quote for 1300 sq ft single story stucco SoCal house was $950.
 

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I am not assuming anything. I am sure that lots of times, two separate companies have worked together and it works out alright. But, mistakes happen, and there is potential of "he said, she said".

If I design a system poorly, and I do the install, all liability is on me. If I hire a guy to design, and the designer messes up, again, it's on me. But, in this scenario, I install, and it passes code, yet the design is wrong, who is going to be at fault? Thats why I was using the dinner and grocery analogy.
 

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Being a newbie here I certainly want to mind my manners. But I just finished reading Flash's baby room thread. All I could think of while reading about all of the possible solutions is that someone with a lot of knowledge and good software might have been able to pinpoint the problem. It seemed obvious that whoever designed and installed the defective system didn't do the due diligence.

I'm not sure myself that the issue is closed regarding using a specialty consultant and letting the contractor follow the prints. I don't see how there is a problem if the prints are followed to the letter.

In my work as a contractor I sometimes had to follow what a structural engineer indicated. If an inspector didn't like what he saw then a change order was executed to make corrections. Sadly, I never saw an engineer fund those corrections. I don't have a whole lot of respect for engineers away.

I apologize if I contradicted myself.
 

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Seems a stamped set of plans will have a T24 page in it(in California this is a requirement on that page you can collect the heat gain and heat loss cfm for each room.
I always install systems in the same environment and can size rooms by doing a walk thru,
each fau offers a cfm rating as 400 cfm per ton = about 500 feet per ton
each unit needs the correct return ducting to allow the correct static pressues which allows the compressor to run at specfic ranges of head pressures.
Long story short...any a/c guy can size a system if that guy has been trained well.

And any hvac guy will give you a start up report from his imanifold...
 

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B.T. Since you mentioned oversizing, I have a question. Do you guys design for latent heat removal (humidity)? Or sensible heat design?

It seems as though you don't want too big of equipment to deal with latent heat. But whe it gets real hot (95+) you also have to deal with sensible heat.
 

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B.T. Since you mentioned oversizing, I have a question. Do you guys design for latent heat removal (humidity)? Or sensible heat design?

It seems as though you don't want too big of equipment to deal with latent heat. But whe it gets real hot (95+) you also have to deal with sensible heat.
I think I'd rather deal with a couple degrees warmer and dry than cool but damp.
 

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True. But with standard efficiency equipment parts are readily available, and one isn't required to purchase o.e.m. parts at a convenient markup.

Iam not hating on modulating equipment or variable speed motors in the way they operate. Its just a homeowner of modest means can be put in a vulnerable situation. And, all savings from the utility bills are negated.
 
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