nest learning thermostat: can you teach an old ......aesp’s spring conference portland, or...
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Nest Learning Thermostat:Can You Teach an Old Thermostat New Tricks?
Carlyn Aarish
February 11, 2015
© 2015 CadmusProperty of Cadmus, no part may be copied or used without written permission
Evolution of Thermostats
Manual
User manually adjusts setpoints
Programmable
User programs setpoint schedule
Wi-Fi Connected
User adjusts/programs setpoints remotely
Smart
Thermostat adjusts/programs setpoints
2
3
Objectives
Gas saved on heating(Gas furnaces)
Electricity saved on cooling(Central AC)
4
Program Design
Test Control
N = 1,400
n = 700 n = 700
N = 4,645
5
Methods
Pre/Post billing analysis
6
Methods
Pre/Post billing analysis
Indoor temperature metering
6
Methods
Pre/Post billing analysis
Indoor temperature metering
AC run time metering
6
Methods
Pre/Post billing analysis
Indoor temperature metering
AC run time metering
Participant surveys
6
Heating Season Gas Savings
7
Cooling Season Electric Savings
8
Heating Season Temp Profile
Asleep AwayHome Home
9
Heating Season Temp Profile
Asleep AwayHome Home
10
Cooling Season Temp Profile
Asleep AwayHome Home
11
Cooling Season Temp Profile
Asleep AwayHome Home
12
Reasons for Low Cooling Season Savings Potential
13
Reasons for Low Cooling Season Savings Potential
1. Children out of school
13
Reasons for Low Cooling Season Savings Potential
1. Children out of school
2. Cooling season shorter than heating season
13
Reasons for Low Cooling Season Savings Potential
1. Children out of school
2. Cooling season shorter than heating season
3. HVAC run times shorter in summer
13
Asleep AwayHome Home
Asleep AwayHome Home
How I Think I Look
14
How I Actually Look
15
Ideal
60
62
64
66
68
70
72
74
76
78
80
Tem
per
atu
re (
˚F)
NOV DEC JAN FEB
16
Actual
60
62
64
66
68
70
72
74
76
78
80
Tem
per
atu
re (
˚F)
NOV DEC JAN FEB
17
60
62
64
66
68
70
72
74
76
78
80
Tem
per
atu
re (
˚F)
OCT NOV DEC
18
Actual
60
62
64
66
68
70
72
74
76
78
80
Tem
per
atu
re (
˚F)
OCT NOV DEC
19
Actual
60
62
64
66
68
70
72
74
76
78
80
Tem
per
atu
re (˚F
)
OCT NOV DEC
20
4850525456586062646668707274767880
Tem
per
atu
re (˚F
)
OCT NOV DEC JAN
21
Taking Analysis Further
22
Taking Analysis Further
• What are impacts on utility peak demand?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
• Do savings persist over time?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
• Do savings persist over time?
• How do other smart thermostats compare?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
• Do savings persist over time?
• How do other smart thermostats compare?
• What are impacts in different climate regions?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
• Do savings persist over time?
• How do other smart thermostats compare?
• What are impacts in different climate regions?
• What are impacts on different HVAC equipment?
22
Taking Analysis Further
• What are impacts on utility peak demand?
• What are impacts if paired with DR program?
• Do savings persist over time?
• How do other smart thermostats compare?
• What are impacts in different climate regions?
• What are impacts on different HVAC equipment?
• What areas would YOU examine?
22
Save The Dates
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