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Discussion Starter · #1 ·
We're putting up new construction in northern NJ and will be using a new HVAC contractor. Getting many different proposals from two we like and could use some help from the board.

Here's the situation. Approximately 2,700 ft2 on each of the first and second floors, 1,700 ft2 livable in the basement with the balance for an unheated garage. 10' ceilings in basement and on first floor, 9' on the second. R13 wall insulation and R30 ceiling. A 14'x14' opening for the stairs next to the foyer that goes from the FF to the ceiling of the second. MBR takes up a third of the second floor. In addition there are two relatively unused rooms up there, guest and laundry. Back stairway to the basement. Flat roof (12/5) and complex lines limit attic space.

The two guys gave us numerous proposals with Carrier and Payne. We like Carrier and a 3 system, 4 zone.

One proposal:
Zone 1 (basement) and Zone 2 (1st floor) serviced by a 58MCB120-20 furnace with 112 btuh at 92% AFUE. CNPVP60 coil and condenser provide 5 ton and 13 SEER.

Zone 3 (MBR) serviced by a 58STA070-12 at 54 btuh and 80 AFUE. CNPHP24 coil and condenser provide 2.5 ton and 13SEER.

Zone 4 (rest of 2nd floor) serviced by another 58STA070-12. A CNPHP60 coil and condenser provide 3 ton and 13 SEER.

Another proposal:
Zone 1 (basement) serviced by a 58MVC60 at 56 btuh and 95 AFUE. CNPVP24 coil and condenser provide 2 ton and 18 SEER.

Zone 2 (1st floor) serviced by a 58MVC80 at 74 btuh and 95% AFUE. CNPVP36 coil and condenser provide 3 ton and 17.5 SEER.

Zone 3 (MBR) and Zone 4 (rest of 2nd floor) serviced by another 58MVC80 and a CNPHP36 coil and condenser at 3 ton and 17.5 SEER.

Any thoughts generally?

Will the two 58STA units in the attic knock people out of bed when they kick in? How would the one 58MVC compare in this regard?

We like these guys but feel they are giving us a Chinese menu of options without really getting behind any one configuration. We're not HVAC experienced and miss the guy we used to deal with.

Maybe there aren't any real differences between the two (other than the cost ;)).

Thx for input.
 

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Welcome to CT:thumbsup:

Mind filling out your profile including area then doing an intro in the introduction section?
 

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Hey leftwing, now that you filled out your profile and did the intro, let your post sit for a little while. You will get great advice.

The HVAC guys here will chime in eventually.:thumbsup::thumbsup:
 

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First.

Why only have R13 insulation in the walls of a new house. Should be atleast R19.
Second. Get contractors that will do load calcs to see what size systems you really need.

Hopefully, you did a typo in proposal #1, when you listed a 2 ton coil, with a 2.5 ton condenser.
 

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Disregarding the heat load and insulation thing, I like the premesis of #1. Separate unit for the mb, one unit for the basement & 2nd floor (likely occupied zones at the same time), and one for the other part of second floor. Either way, you are going to end up with three units. Obviously, we aren't privy to actually being there, but if both the first floor and second floor are going to be occupied at the same time, it makes sense to use just one unit there. Also, The second option comes with a lot of fancy equipment.

There are some benefits to the fancy gear. There is plenty of litterature online in finding out the pros and cons of basic versus high seer equip. The tax credit thing is groovy. But, twelve years later, one may regret having purchased the said equipment.

If the ductwork is well done, you the noise shouldn't be too major. If not, the noise could be an issue.
 

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A load calculation is a must. These things should not be guessed, especially when we are talking high efficiency equipment.
 
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