I have been lurking here for the last 6 months and have learned much. I am building a 4800sf home in the Dallas TX area and it is now decision time on my HVAC units. I wanted to go geothermal, but i cant justify the cost (over double) vs. a high efficiency heat pump. I have had loads run by richard rue at energywisestructures.com
First a little about the project:
Wife and I + 4 kids in a 4850sf house near Dallas, TX
Stick built with .5lb open cell foam total encapsulation (cool attic) metal roof
Load was split into 2 units (one upstairs 2 ton one downstairs 4.5 ton) 6.5 tons total. I am considering splitting the downstairs into 2 units one for master suite and one for rest of living area.
Load Estimation via energywise
Downstairs: Heat 65550 btus Cooling 51467 btus
Upstairs: Heat 18358 btus Cooling 19718 btus
Based on winter indoor @ 70F outdoor 22F Summer indoor @75F outdoor 102F
I am looking at the Carrier Infinity Heat Pump 16 seer line and have been given these model numbers to look at:
Condensers M# 25HNA636A003 with a fan coil M# FE4ANF00300
M# 25HNA624A003 with a fan coil M# FE4ANF00200
These are 2 and 3 ton configuration as I am highly considering splitting the bottom into 2 systems. I tried to look these combos up at the ceedirectory.org and could only find 25HNA636A30 is this different than the A003 suffix? I found these not sure if this is correct though.
1250410 Active OEM INFINITY 16 PURON HP CARRIER AIR CONDITIONING 25HNA636A30 FE4AN(B,F)003+UI 34000 11.90 15.50 32600 8.60 18600 Energy Star HRCU-A-CB
1250413 Active OEM INFINITY 16 PURON HP CARRIER AIR CONDITIONING 25HNA636A30 FE4AN(B,F)005+UI 35400 12.40 16.20 33800 8.80 19000 CEE Tier 1 HRCU-A-CB
1250404 Active OEM INFINITY 16 PURON HP CARRIER AIR CONDITIONING 25HNA636A30 FE4ANB006+UI 35800 12.60 16.50 34200 9.00 19100 CEE Tier 2 HRCU-A-CB
882735 Discontinued OEM INFINITY 16 PURON HP CARRIER AIR CONDITIONING 25HNA636A30 FE4ANF002 33600 11.50 15.00 33000 8.50 18900 Energy Star HRCU-A-CB
1250407 Active OEM INFINITY 16 PURON HP CARRIER AIR CONDITIONING 25HNA636A30 FE4ANF002+UI 33600 11.50 15.00 33000 8.50 18900 Energy Star HRCU-A-CB
Seems that the air handler is different on these???? Can a 5 ton Handler go on a 3 ton unit???
The additional cost to go 3 units vs. 2 units (with 3 zones) is less than $1000 after rebates and not needing the zone controller. Plus duct work will be much easier. Is there any reason not to go 3 units (3+2+2 vs 5+2)?
Any insight to the best match of condensers and air handler match would be of great help as i want to be as efficient as possible without blowing the budget. I would like to stay 2 stage + variable speed for dehumidification purposes.
I have been advised by energywise NOT to get a ERV as i should have enough air changes in normal 6 person lifestyle. I would like to procede w/o one. Is this hard to retrofit if needed down the line?
Thanks again for your thoughts. I have to decide soon.