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Heatpump for a new home

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bcdfgh

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Discussion starter · #1 ·
I'm currently in the design stage for a 2-story house plus a basement. Since the house is small (900 sf on each floor or 1800 sf finished space) I want only 1 heatpump and place it in the middle of the basement. Are there any issues if the return duct goes straight from the basement to 1st floor to 2nd floor? Basically make it share among 3 floors including basement to remove moisture.
 
Discussion starter · #3 ·
I don't want anyone to access the attic when the temp up there is 100 in the summer or 0 in the winter. Besides this, the house is small.
 
#5 ·
I see nothing wrong the plan. Make the return from the second floor bigger than the one on the first floor. If you don't then the first floor one will be the one carrying most of the air.
I can see your point that two systems may be oversized.
Be sure to get a load calculation and duct design or your idea will fall flat.
 
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Discussion starter · #7 ·
Thanks everyone for the advice. It's great that it can be done without putting a system in the attic. I'll sure get a load calculation and also get manual damper controls.
 
#8 ·
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#9 ·
BaldLoonie said:
Fire dampers? What causes them to be needed. Never seen them in a residence around here ever.
Click to expand...
If the same vertical chase returns air from 2 or more floors. It allows a fire to spread from one floor to the next through the return chaise.
 
#11 ·
bcdfgh said:
I'm in MD
Click to expand...
BALTIMORE BLT-WASHNGTN INT'L

39.17'N 76.68'W
154' Elevation

ASHRAE 2009

4,567 _ Heating Degree Days
1,228 _ Cooling Degree Days

12.9'F ___ 99.6%
17.3'F __ 99.0%

DRY Bulb
... / WET Bulb
93.9'F/ 74.9'F ___ 0.4%
91.2'F/ 74.2'F __ 1.0%
 
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#12 ·
IECC 2012 __ http://publicecodes.cyberregs.com/icod/iecc/2012/icod_iecc_2012_re4_sec002.htm

CLIMATE ZONE
http://apps1.eere.energy.gov/buildi...tions/pdfs/building_america/4_3a_ba_innov_buildingscienceclimatemaps_011713.pdf

1 . FENESTRATION U-FACTORb
2 . SKYLIGHTb U-FACTOR
3 . GLAZED FENESTRATION SHGCb, e
4 . CEILING R-VALUE
5 . WOOD FRAME WALL R-VALUE
6 . MASS WALL R-VALUEi
7 . FLOOR R-VALUE
8 . BASEMENTc WALL R-VALUE
9 . SLABd R-VALUE & DEPTH
10. CRAWL SPACEc WALL R-VALUE

1 NR
0.75 0.25 30 13 3/4 13 0 0 0

2
0.40 0.65 0.25 38 13 4/6 13 0 0 0

3
_ 1 __ 0.35
_ 2 __ 0.55
_ 3 __ 0.25
_ 4 __ 38
_ 5 __ 20 or 13+5h
_ 6 __ 8/13
_ 7 __ 19
_ 8 __ 5/13f
_ 9 __ 0
_10 __ 5/13

4 except Marine
_ 1 __ 0.35
_ 2 __ 0.55
_ 3 __ 0.40
_ 4 __ 49
_ 5 __ 20 or 13+5h
_ 6 __ 8/13 19
_ 7 __ 10 /13
_ 8 __ 10, 2 ft
_ 9 __
_10 __ 10/13

5 and Marine
4
0.32 0.55 NR 49 20 or 13+5h 13/17 30g 15/19 10, 2 ft 15/19

6
0.32 0.55 NR 49 20+5 or 13+10h 15/20 30g 15/19 10, 4 ft 15/19

7 and 8
0.32 0.55 NR 49 20+5 or 13+10h 19/21 38g 15/19 10, 4 ft 15/19
 
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#13 ·
1,800 sq feet, 2-story in central MD

IECC 2012
Thermal Building Envelope

230 Square Feet of Glass Area
1,870 Square Feet of Wall Area
Ducts in conditioned space

. HEATING 18,880 BTU/HR at 16'F . ... $ 473 at $0.14 / kw-HR - 4,700 Heating Degree Days with 16 SEER Heat Pump
................................................... small heat strip
. COOLING 14,500 BTU/HR at 92'F ... $ 208 for 1,160 effective full operating hours
................................................. $681 annual

Heating - Thermal Balance Point 21'F

add ~ 20% for heating of a finished basement
 
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