natural gaselectricity reduce energy demand behavior changes air sealing insulation landscaping and...
TRANSCRIPT
The Value of R-Value
Home Energy Use
School Energy Use
Natural Gas Electricity
Energy Efficiency
Whole House Approach
Reduce
energy
demand
•Behavior changes
•Air sealing
•Insulation
•Landscaping and windows
Use energ
y efficiently
•Heating and cooling equipment
•Transport
•Lighting and appliances
Use clean sourc
es
•Solar•Geothe
rmal•Wind
Comfort and the Building Shell
Solar heatAir
Leakage
Internal Heat
Trans-mission
Heat Removed by Cooling System
Ceiling Transmission
Wall, Fenestration, Foundation
Transmission
Air Leakag
e
Heat Supplied by Heating System Internal and Solar Heat
Source: Residential Energy, 5th Edition
Cold
clim
ate
hom
es
wit
h m
a-jo
r air
leakag
e o
r in
sula
tion
p
rob
lem
s
Avera
ge c
old
clim
ate
hom
es
Avera
ge t
em
pera
te c
limate
h
om
es
Well
insu
late
d h
om
es
wit
h
low
air
leakag
e
Very
well
insu
late
d a
nd
air
tig
ht
hom
es
wit
h h
eat-
recovery
ven
tila
tors
0
20
40
60
BTUs per Hour per Square Foot
0
400
800
1200
Square Feet Cooled per Ton
Variations in Load
Source: Residential Energy, 5th Edition
Recommended R-Values for Colorado
Source: Colorado Governor’s Energy Office
Space Recommended R-Value
Attic 49
Wall 18
Floor 25
Crawlspace 19
Basement 11
Which is better?
Passivhaus