A detailed report of the opportunities that I identified for reducing energy and water consumption for the house that I audited in San Francisco.

1. SAN
FRANCISCO,
CA
Energy Audit
Sarvesh Dandekar
Spring 2018

2. TABLE OF CONTENTS:
Section I: IntroductionSection
Section II: EnvelopeSection
Section III: HVACSection
Section IV: Health and Safety Concerns – Opportunities OnlySection
Section V: Base Load – Opportunities OnlySection
Section VI: SummarySection

3. Section I -
Introduction
 Location: 163 Alpine Terrace, San
Francisco, CA - 94117.
 Mediterranean climate with moist mild
winters and dry summers.
 Built in 1906, remodeled in 1988.
 1800 square feet.

4. Basic Building Features
2 story home
10 rooms :
 4 bedrooms, 3 bathrooms
 2 living / dining area
 1 home office
2 fireplaces in living area (not in use)
Attic converted into a bedroom.

5. The Occupants
1 woman
Living since 1990
Visitors include daughter and her
grandsons who come over on
weekends and during holidays.

6. Results from Occupant Interview
Question Topic Response
Work done on home: Attic on the second level converted into a bedroom
Work being planned: Changing windows and setting up a gas fireplace
Comfort Issues: Drafty, feels cold inside in winters and hot in
summers.
Satisfaction with the heating
system:
Unsatified with it. Usually wears a sweater to feel
warm.

7. Bi – Annual Gas Cost Trend
Husband passed away
 Annual Gas
Base Load:
$67.24

8. Electric Cost Trend - 2016
 Annual Electric
Base load: $2056
 Peak Electric
Heating Cost: $607
0
50
100
150
200
250
300
Feb-16 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Sep-16 Oct-16 Nov-16 Dec-16 Jan-17
Electric Charges($)
Electric Charges($)

9. Electric Cost Trend - 2017
 Annual Electric
Base load: $390
 Peak Electric
Heating Cost: $583
0
20
40
60
80
100
120
140
Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18
Electric Charges($)

10. Bill Disaggregation - 2017
Electricity
• Peak heating: $583
• Electric baseload: $390
Gas
• Peak heating: $83
• Gas baseload: $5.60
Total heating = $666

11. Heating cost per square foot
$0.37For a house with only heating, the cost per square foot
should be between 7 – 10 cents per square foot.

12. Section II – The envelope

13. How leaky is the house?
Closet in bedroom 1
- Holes and openings in the walls.
Air leaks

14. How leaky is the
house?
Air leaks in the attic.

15. How leaky is
the house?
Gaps in the attic
and closet in the
living room.

16. How leaky is the
house?
Duct penetrations
Windows
Exhaust fans

17. Envelope Recommendation
• Air Sealing and fully insulating the Attic.
• Seal outlets, plumbing penetrations,
exhaust fans and lighting fixtures.
• Have a professional insulate the roof /
ceiling (R – 30)

18. Section II – The
Envelope(Radiant Heat
Assessment)
Large Windows, Single pane
 Radiation due to glazing
 Conduction through window frame.
Recommend applying window film or
screen for increased shading during
hot summer months.
 East side of the house.

19. Section II – The
Envelope (Thermal
Boundary)
Thermal Boundary
 Poorly installed installation.
Recommend fully insulating the
attic.

20. Section II – The
Envelope(Thermal Boundary)
Skylighting present in 3 locations in the home.
 At the entrance.
 The other 2 in bedrooms.
Recommend air sealing them.

21. Section III - HVAC

22. Existing
Ventilation
• Exhaust fan in each
bathroom.
• Passed the toilet paper
test.
• Fans automatically turn
on with light switch.

23. Post – Retrofit Ventilation (Bathroom)
Recommendations:
Location Fan Size Control
Bathroom 1 8ACH intermittent (58 CFM) Humidity Sensor
Bathroom 2 8ACH intermittent (58 CFM) Humidity Sensor

24. Kitchen Ventilation
Existing:
• Exhaust fan above
stove.
• Easily holds toilet paper.
Post – Retrofit:
Recommendations:
• Existing system ok since
not much cooking is
done.

25. Post – Retrofit Ventilation (Whole House)
BAS whole home ventilation options:
Recommendation:
• Install a continuous 75 CFM HRV fan
OR
0.01 x Floor Area + 7.5 x (Bedrooms + 1)
0.01 x 1800 + 7.5 x (4+1)
= 55.5 CFM

26. Heating
Equipment
• Type:
o Electric furnace
• Location:
o Bathroom, second level.

27. Heating Equipment
• Type:
o Electric space heaters(3)
• Location:
o Master Bedroom
o Bedroom 1
o Living room

28. Heat Load Calculation
Based on existing conditions:
• Recommended furnace:
o Efficiency : 95%
o Size : 46,592 BTUh input
Post Retrofit heating:
• Target heating load: 54,000 BTUh
Recommendation:
• Stick with existing system.
44,262
BTUh

29. Existing Ducts

30. Section IV – Health and Safety Concerns
(Opportunities only)

31. Combustion
Safety Issues
• No noticeable issues
related to Backdrafting,
Flame Rollout, or flame
quality.

32. Combustion Safety Issues
Confined Space:
• Available space: 1000 cubic feet
• Required space: 1900 cubic feet
As louvered door is present, we may not worry.
Recommendation:
• Just to increase safety, we may add two vents.
• One within 12’’ of the ceiling and one within 12’’ of
the floor.

33. Health concerns - IAQ

34. Section V : Base Load

35. Electric Base
Load
Opportunities
Refrigerator
Recommendations:
• Replace old (1985)
refrigerator with an
efficient energy star
refrigerator.

36. Survey of Electric Base Load
Electronics:
Electronics “ON” Watts “Standby” Watts
Television 400 1
Microwave 1150 0
Space heater 1500 1
Laptop 15 1
Refrigerator 70 1
Coffee Maker 1100 1
No significant
Recommendations:
• Keep coffee maker
unplugged.
• Use space heater only
when needed.

37. Section VI : Summary

38. Major opportunities to
• Create a more comfortable climate.
• Minimize temperature difference between first and second level.
• Minimize indoor air pollution.
Main Recommendations:
• Improve the envelope.
• Check for air leakage and seal when possible.