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Posted on 11/1/18 at 8:25 pm to Joshkdixon
Who is your HVAC contractor?
Posted on 11/1/18 at 8:26 pm to Joshkdixon
Get radiant barrier installed with an extra fan-powered roof vent before they finish. Now it the time to do those upgrades. Also make sure they install enough damn insulation.
Posted on 11/1/18 at 8:27 pm to RadBro
quote:
Carrier infinity system. Look it up.
10 years ago we installed 2, 21 seer Carrier infinity 3 tons units with spray foam insulation. They cool the house very well.
Posted on 11/1/18 at 8:31 pm to wickowick
We also have the Carrier Infinity with 3 zones and it kicks arse.
This post was edited on 11/1/18 at 8:34 pm
Posted on 11/1/18 at 8:49 pm to Joshkdixon
Your ceilings are tall but 1 ton per 500 sq/ft is a lot for a new house. That typically would be in line with an older home, did they run the specs from your plans through an estimating program to properly size the unit?
Posted on 11/1/18 at 8:53 pm to Martini
Total Comfort is preferred by builder.
Posted on 11/1/18 at 8:54 pm to Joshkdixon
quote:
That was another concern, although they have since quoted others...Goodman, Rheem, Tempstar, Amana.
Stay away from Lennox, Goodman, Tempstar, and Mitsubishi minisplit.
Trane is the way to go. Carrier would be the 2nd best option regardless of what kinda “deal” you can get. There is a reason people get good “deals” on Lennox and Goodman units. Those Mitsubishi units are finicky and can be more trouble than they are worth and are notorious for Freon leaks.
Posted on 11/1/18 at 8:55 pm to tes fou
I specifically asked owner of hvac company if he did manual J or just used rule of thumb. He said manual J, although I have not seen it myself, nor did I ask to.
Posted on 11/1/18 at 9:12 pm to Joshkdixon
I am a building contractor. I had a home I built for myself that had a similar set up. I had 3200 sqft and foam insulation. It had the Lennox 5 ton 16 seer var speed unit with a 2 stage condenser. The 1st story was on one zone and the 2nd on the other. I was there 5 years and the house cooled great. I cant remember what series it was, but it was the high series, maybe signature series? It was compatible with their best thermostat. It never broke, needed service, etc. I paid about the same as 2 of the lower seer/non efficient models. It was more about trusting my HVAC guy and he recommended it for the spray foam house being multi stage and var speed. He ran a J Load and I would def have that done.
If it were me, I'd probably go with 2 units if you have regular insulation set up and 1 unit that has all the bells and whistles if you go spray foam.
Only one complaint on the Lennox, it had a loud clunk when the condenser shut off. They said it is a relief on the fan motor. It was pretty loud and sounded funny. I've worked with Carrier, American Standard, Goodman, and Traine. I would use Lennox again.
If it were me, I'd probably go with 2 units if you have regular insulation set up and 1 unit that has all the bells and whistles if you go spray foam.
Only one complaint on the Lennox, it had a loud clunk when the condenser shut off. They said it is a relief on the fan motor. It was pretty loud and sounded funny. I've worked with Carrier, American Standard, Goodman, and Traine. I would use Lennox again.
Posted on 11/1/18 at 9:18 pm to Libertariantiger
Thanks. Good feedback. No foam here. R30 blown in attic and r13 batted in walls. Radiant barrier plywood sheathing for roof. Low-e windows. Primarily brick exterior with some hardi around rear patio.
Posted on 11/1/18 at 9:18 pm to MikeBRLA
quote:quote:
in South LA too large of a unit is worse than too small.
Why is that? Just curious.
An AC's job isn't really to lower air temperature; Its job is to remove humidity and ventilate the conditioned space. The heat contained in the water vapor in the air is typically the majority of the heat contained in the air, by a LARGE margin. The AC's job is to get rid of this heat by chilling the air so the water condenses out. To do this effectively, it needs to run for a time to allow adequate condensation to occur.
Oversized systems can turn on and very quickly chill the air, causing the thermostat to shut the system back off after only a few minutes. This is called "short cycling". When this happens, the AC does a great job of dehumidifying the air that actually passes through it, but does a bad job of dehumidifying, mixing, and circulating the bulk air in the conditioned space because it just doesn't run long enough to really move enough air through the AC to ensure that the air in the conditioned space is well mixed and dehumidified.
Oversized systems may result in a house with hot spots and cold spots because there isn't adequate mixing and circulation. Houses with grossly oversized AC systems can also exhibit problems normally associated with poor moisture control and poor ventilation, like mold and mildew, due to the inadequate dehumidification because of short cycling.
This post was edited on 11/1/18 at 9:46 pm
Posted on 11/1/18 at 9:23 pm to EA6B
quote:
I would not trust any "rule of thumb" he needs a accurate heat load calculation for the house, in South LA too large of a unit is worse than too small.
Agree. If you have too much AC your compressor will not run long enough to dehumidify. There are software programs that can calculate the load based on SF, orientation, windows, insulation, people in house, etc. Your builder should be able to help or others on here.
Posted on 11/1/18 at 9:26 pm to cajuncarguy
Thanks. Owner of hvac says he did manual J calculation, which I specifically asked him. I trust that he did. I'm leaning towards 2 separate systems.
Posted on 11/1/18 at 9:31 pm to Joshkdixon
Google the Lennox class action lawsuit for bad evaporator coils. I just had to replace them on my 3 year old house. Garbage
Posted on 11/1/18 at 9:32 pm to TigerstuckinMS
Just as a Q on condenser units. They are a compressor, most are now scroll type, and a condensing coil. Basically a simple unit.
How can they all be so different in efficiency ?
Coil types, size, compressor efficiency ?
How can they all be so different in efficiency ?
Coil types, size, compressor efficiency ?
Posted on 11/1/18 at 9:37 pm to Drop4Loss
quote:
How can they all be so different in efficiency ?
Motor electrical efficiency
coil geometries
heat transfer equipment material selection
compressor mechanical efficiency
refrigerant efficacy
effectiveness of airflow design
There's a lot that makes a difference. In short, efficiency costs more, so a lot of the difference can be attributed simply to concessions manufacturers have to make in construction and materials to meet customer expectations in terms of price.
This post was edited on 11/1/18 at 9:41 pm
Posted on 11/1/18 at 9:39 pm to TigerstuckinMS
quote:
An AC's job isn't really to lower air temperature; Its job is to remove humidity and ventilate the conditioned space. The heat contained in the water vapor in the air is typically the majority of the heat contained in the air, by a LARGE margin. The AC's job is to get rid of this heat by chilling the air so the water condenses out. To do this effectively, it needs to run for a time to allow adequate condensation to occur. Oversized systems will turn on and very quickly chill the air, causing the thermostat to shut the system back off. This is called "short cycling". When this happens, the AC does a great job of dehumidifying the air that actually passes through it, but does a bad job of dehumidifying, mixing, and circulating the bulk air in the conditioned space because it just doesn't run long enough to really move enough air through the AC to ensure that the air in the conditioned space is well mixed and dehumidified. Oversized systems may result in a house with hot spots and cold spots because there isn't adequate mixing and circulation. Houses with grossly oversized AC systems can also exhibit problems normally associated with poor moisture control and poor ventilation, like mold and mildew, due to the inadequate dehumidification because of short cycling.
this shite right here is why we need a Housing/Real Estate Board.
Posted on 11/1/18 at 9:46 pm to Joshkdixon
quote:The owners know their stuff. I knew their dad and he worked those boys hard to learn their shite.
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