New construction two stage verses single
We are building a new home in the charleston sic area Hot and humid! The home is 4400 sqft with 2850 on first and 1580 on second with 547 worth of 20 foot ceilings.
I had specs 2 stage 16 seer but am struggling with cost. Original plan was 3 units master suite and study 780sqft, rest of lower level 2000 sqft with high ceilings and the upstairs. Manual j by the builder is about 7 ton
Quote came in for a 5 and a 3 which puts master suite on 5 ton with all the high ceilings. To had a zone capability is not much less than adding a 1.5 single stage with two speed VAM.
So at the end question is with SC coastal cooling days will I below the threshold often enough to have 2 stage make sense? Or could I go 3 single stage with two Speed VAM and get near 15 and be in pretty good shape.
House should be pretty tight foaming attic space and under first floor, also used liquid applied membrane and personally caulked all top and bottom plates,jack studs, windows doors etc foamed all cells, and intrusion points.
Thanks for reading this far!
Are you in an area that reaches 105 outdoor temp? 7 tons sounds big for a spray foamed attic and basement.
Yes it can do that easy in the summer. Bases celing will be foamed but is drive under construction so ceiling I'd 8'8" above grade.
Originally Posted by beenthere
I may have misses something here?
Is this an encapsulated home? Attic, walls and floors foamed?
I am In a coastal area and 5 tons is a little big for an encapsulated home.
And yes we use 2 speed HP's for comfort.
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Life is too short, Behappy!
Attic and first floor everything else is batted
Originally Posted by behappy
A word of caution, do not live in this space without fresh air ventilation. Most codes are suggesting mechanical fresh air ventilation to purge indoor pollutants and renew oxygen. Also the cooling load is reduced to the point that the a/c will not operate enough to remove the moisture from the occupants and adequate fresh air ventilation. Suggest a small whole house ventilating dehumidifier like an Ultra-Aire XT105H to provide fresh air and humidity control.
Originally Posted by Dgg
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"
Can you share a little,more detail as it apples to this space?
Originally Posted by teddy bear