cee's home energy efficiency index webinar
TRANSCRIPT
Jenny Edwards and Carl Nelson
September 13, 2012
Welcome to CEE’s Home Energy Efficiency Index Webinar
We’ll start the presentationshortly.
Hover your cursor at the top of your screen to access the WebEx menu bar and open your Chat window.
We will use the chat function for Q&A at the end of the presentation, but feel free to ask clarifying or technical support questions throughout
Page 2
Page 3
Community Energy Services key features
• Extensive community engagement
• Comprehensive pathway to energy savings• Good energy habits• Direct install of materials• Major energy upgrades
• Contractor program w. quality assurance
• Follow-up services / financing
Page 4
Home Energy Visits1½ - 2 hour visit
2 energy experts
Direct installation of materials
Blower door test and insulation checks
iPad data collection; print report at site
Page 5
[insert slide on recommendations]
Frequency of Different Upgrade Recommendations
Page 6
Design Features of the Energy Index
Page 7
Page 8
Minnesota Home Energy Score Pilot
1
5
4
3
2
6
7
8
1 Pilot Homes 154
Current Score
Potential Score
Scor
e 1
10 “Zone of Unattainability”
Page 9
Common approach to building asset ratings
Building Energy
Simulation Model
Site Data Collection
Rating or Score
Occupancy Assumptions
Estimated Energy Use
Page 10
CEE Scoring Methodology
SIMPLEBuilding Energy Model
Representative Housing Types
Point distribution for each retrofit(1 story home)
Number of Stories, House Age, Floor Area
Page 11
CEE Scoring Methodology
CEE Energy Index API
In-HomeData Collection
Page 12
Example: Wall Insulation
0
5
10
15
20
25
30
35
40
Tota
l Poi
nts Wall
Insulation27 points
9 points
1-story 1920’s home; Recommended insulation: R-11Total points = 27
Wall cavity of R-3 gives 9 points
18 available Points
Page 13
+ CEE has delivered 447 scores in Minneapolis and St Louis Park
+ Score does not add appreciable time increase to visit
+ Positive reaction: Homeowners respond to having a good grade, and staff have tool to back up recommendations
+ Priorities of action are clear from point system
+ Compared to giving recommendations without a score:+ Low available points can be a hurdle for action
+ However, this is justified – we are applying the pressure to act where there are more savings
Summary of Early Experience
Page 14
Score Distribution
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%0
10
20
30
40
50
60
70
80
90
100
Percent of Homes
CEE
Ener
gy In
dex
50% of homes score a 73 or higher
20% of homes score an 85 or higher
Based on 447 Homes
Page 15
How different housing types score
Home Energy Index
Perc
ent o
f Tot
al
Page 16
Which upgrades offer the most points?
76% of points come from immediate, cost-effective recommendations
Page 17
10 20 30 40 50 60 70 80 90 1000
1
2
3
4
5
6
7
8
9
10
f(x) = − 0.0466018571206959 x + 8.06198329172092R² = 0.30882139419292
CEE Energy Index
Gas
Use
Inte
nsity
Inde
x
Relationship between Index and Site Energy Use
Page 18
+ Partner with other groups to deliver the score in new regions
+ Offer certificate of completion when homeowners have made upgrades
+ Investigate the impact of the score on homeowner follow through.
+ Consider refinements such as accounting for ‘above-and-beyond’ energy retrofits, e.g. PV
Next Steps
For More Information
Using Tablets to Collect Data in the FieldNovember 8, 2012 – 12:00 pm CST
http://mncee.org/Innovation-Exchange/
Events-and-Webinars
Contact Jenny Edwards:
(612) 335-5873
Visit the Innovation Exchange website:
http://mncee.org/Innovation-Exchange/Home/
Next Webinar: