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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

Carlyn Aarish

617-673-7139

carlyn.aarish@cadmusgroup.com

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