This document summarizes the installation of a ground source heat pump system for a new 6,000 square foot home in Stillwater, Oklahoma. It describes the key steps taken, including drilling six 300-foot boreholes, installing piping in the boreholes and connecting them with a header, installing three heat pump units, ductwork, and a desuperheater to supplement the water heater. The total installed cost of $45,321 was lower than a conventional system would have been, and the homeowners realized energy cost savings over the first four years of operation.

1. 1
3708 W. Deer Crossing Dr, Stillwater, OK
New Construction 2010
4 year results: Ground Source Heat Pump System
Find online at youtube.com search igshpa

2. New System to install: Closed-Loop Ground
Source Heat Pump with Desuperheater
2
• Foundation poured
December 26, 2008
• Home size: 6,000 SF
• Layout: 2 story,
ductwork in attic, HPs
in attic.
• 2.5 acres.
• Recommended
Tonnage: 9 Ton
• Ground Loop: 6 Loop
Wells 300’ deep
• Move in date June 1, 2010
• 5 bids to install heating cooling
systems
• HPs 2, 3 & 4 Ton

3. Final Accepted Bid for GSHP System 2009
(complete installation ducts, units, new construction)
• Conventional System Gas, electric would have cost: $30,000
• GSHP System 9 Tons 3 units 2, 3, and 4 ton
– Loop 6 bore holes 300’ deep 1” HDPE $8,100
– Headering $4,124
– Inside Piping $3,912
– Unit Delivery $17,697
– Rough in $9,084
– Final and Start-up $2,402
Total $45,321
– 30% tax credit -$13,599
– $200 per ton from Stillwater, OK electric utility -$1,800
Total cost for the GSHP system $29,922
• Final cost for GSHP System less than a conventional system
and projected annual cost $959 or $80 per month.
3

4. 4
GSHP Installation: Contractor Information
• Location: Goldsby, OK
• 85 miles from Stillwater
• Website: comfortworks.us
• HVAC Specialty:
Geothermal (IGSHPA
Certified)
• Ownership: Chris Ellis
• Background Information:
Established 1975 as C&S
Heating and Air Cond., Inc
Sold in 2007 and became
Comfortworks, Inc.

5. GSHP New Construction Equipment:
ClimateMaster Tranquility 27 Design Features
5

6. 6
6
GSHP New Construction Equipment
2 Ton UNIT 3 Ton UNIT 4 Ton UNIT
5

7. Site Plan Drilling Locations: Preparing the Property
•Drill sites location:
concerns for containment of
mud and water runoff in
street and adj. property.
•Design Recommendation
3,600’ for Loop field.
•Site needs 9 tons so six
boreholes will be drilled to
300’ for a total of 1800 feet
using 1 inch HDPE pipe.
•Recommended spacing
between boreholes was 25’.
7
#2 #1
Home
#3
#4
15’
25’
#5
#6
•All underground
utilities flagged prior
to drilling and digging

8. Site Plan Drilling Locations: Preparing the Property
8

9. 9
9
Drilling the boreholes •Drilling rig is brought onto
site
•Make sure site is cleared
and ready for drilling
•Cuttings in the form of mud
may come from the
boreholes.
•In the city, a reclaim unit
can be used to contain the
cuttings from going into
sewer drain.
•Deer Crossing site is on 2
½ acres with adequate area
for runoff without going into
street or sewer drain.

10. 10
Heat Exchange Pipe Loop for Boreholes
1 inch HDPE pipe loop is placed
in each borehole to serve as a
heat exchanger between the
earth and heat pump
600 feet of 1”
HDPE Pipe in
borehole with
about 5 feet
sticking out
HDPE Pipe comes with U-Bend
thermally fused and tested 610’ long
HDPE Pipe is placed
on spool, pressure
checked with water
and sealed by
bending ends prior to
inserting into
borehole.
The HDPE pipe is then lowered to the bottom
of the borehole with weight of water and
weight of a 1” x 8’ steel rod attached to end.

11. 11
Grouting the boreholes
BH 20 Grout is a Black Hills
20% solids, modified Bentonite
Grout which requires no
polymer additives and is a
complete mineral based
product. Once placed, BH 20
Grout will set into a semi-rigid
plug of the borehole.
Mixing the borehole Grout
•Grout is pumped into each borehole
from the bottom up through a tremie
pipe.
•The grout serves several purposes.
• Seal the hole to prevent aquifer
contamination
• Bond to the pipe
• Serve as an exchange medium
between the earth and the pipe
Grout mixer

12. 12
Grouting the boreholes
Inserting the tremie pipe
Pumping Grout into boreholes
•Tremie pipe is 1st pushed into borehole
to the bottom of the borehole.
•Grout is pumped into each borehole
from the bottom and is gradually pulled
up filling any voids.
•Settling of grout can be expected.
•As grout settles in each hole, it is
refilled to top it off
Grout pumping
from bottom of
borehole to the
top.
Grout fills
borehole
displacing water

13. 13
Connecting the boreholes Trench is dug to place header pipe
connecting the ground loop with the
heat pump units in the home.
4-5 foot deep trench
12” wide for header
piping
All open pipe are
taped or plugged to
prevent dirt from
getting into pipe.
All pipe fittings are socket
fused producing a joint
stronger then the pipe.
Butt weld fusion joint
is stronger than pipe

14. Connecting the ground loops
with the heat pumps through
a reverse return header.
14
4-5 foot deep
trench is dug to
reduce thermal
losses between
loops and heat
pumps. Depth
also prevents
damage to lines
from
landscaping. Trench connects
•Headers are thermally fused at each connection
and lines are pressure tested prior to filling in
trenches
header circulation
pipes to house utility
room and then to
Heat Pumps
Header pipes are
pressure tested to
ensure no leaks
Borehole Loops are connected to
header circulation lines using
Reverse Return

15. 15
Diagram of Header System with
Reverse Return for Cooling
To Heat Pumps
27 GPM Max Flow
2”
2”
2”
2”
2”
2”
1 1/4”
1 1/4” 2”
1”
1”
1”
1”
1”
1” 1”
1”
1” 1”
1” 1”
Ground Loop
6 Boreholes 300’ Deep
1” HDPE pipe

16. 16
16
Covering up the Header and Trenches
•Trenches are filled in and yard brought
to rough grade condition
•Professional operators leave the area,
as good as, or better than before.
•Location of each borehole loop and the
header system is located using metal
plates and GPS.
Trenches are filled in
and yard brought to
rough grade condition
Care is taken to cover
the trench and mix
cuttings with soil.
GPS is used for
location of boreholes
and header system

17. Ductwork Return and supply
boots were installed
in each room
except bathrooms
and kitchen to
minimize pressure
imbalances,
improve privacy,
and is quiet.
17
The first step in
installing ductwork
is to read the floor
plan and locate the
supply and return
vents.
Ductwork is sealed,
insulated, wrapped
and properly
supported.

18. 18
Location of HP and Utility rooms
3Ton
2Ton
4Ton
Location of 3 Ton
Unit 2nd floor
South Utility room
For 1st floor
bedroom zone
conditioning
Location of 4 & 2 Ton
Units 2nd floor North
Utility room for 2nd
floor conditioning
HT
HT
Location of
Purge and Flush
Controls Garage
Utility room

19. •Lines are brought into garage utility room for
connection to heat pump units in attic.
•Each connection/joint is thermally fused to
ensure closed and sealed flow of water in
pipes.
19
19
Circulation Pipes in the Home
Lines from ground
loop are brought
under foundation and
up into garage utility
room
Thermal fusing of
pipe connections
Purging and flushing
connections in garage
utility room
Heating HDPE pipe
and socket tee for
thermal fusing of pipe
connections

20. 20
20
Heat Pump Installation
•Location in utility rooms 2nd floor attic space.
•Three units are installed
•2 Ton Climate Master – Tranquility 27
•3 Ton Climate Master – Tranquility 27 with desuperheater
•4 Ton Climate Master – Tranquility 27 with desuperheater
Tranquility 27 2 Ton Unit
TTV026AGC01ALKS
for cooling/heating 2nd
floor zone
Tranquility 27 3 Ton Unit
TTV038AGC01ALKS
for cooling/heating 1st
floor bedrm/study zone
Tranquility 27 4 Ton Unit
TTV049AGC01ARKS
for cooling/heating 1st
floor Living rm/kit zone

21. 21
21
Circulation Pipes in the Home
•Since circulation lines will run through the
attic, antifreeze is added to prevent freezing
of lines during winter.
•Insulation is added to pipes in attic
Circulation HDPE
pipes in attic are
insulated
Pipes are
connected to
Heat Pump
Units in attic.

22. 22
22
Finalizing Pipe Loop Installation
Inline air bleeder to
burp off any future
trapped air.
Each HP unit has a High
efficiency pump for
circulation between heat
pump and ground loops
4 Ton HP has two
circulation pumps
Ground Loop and
Heat Pumps are
connected to
flushing and purging
cart.
Flushing and
purging cart is
used to
eliminate any air
in the system.

23. 23
23
Connecting Desuperheater to Hot Water Tank
•Desuperheater is connected to
supplement hot water heater with hot
water generated from Tranquility unit’s
heat exchanger
•New electric hot water heater
•Water heater could be put on timer to
take advantage of Time of Use Rate
(1:00 p.m. to 7:00 p.m. peak period)
Desuperheater lines
connected to electric hot
water heater
New electric hot water heater
connected to desuperheater

24. 24
24
Insulation of pipes in attic and
Programmable Thermostat
• All pipes in attic running from ground loop are insulated
to prevent sweating in fall and spring.
•New programmable thermostats installed and set for
Time-of-Use rate
New Downstairs
Furnace/Air Handler
New Programmable Thermostat
Programmed to time of use.

25. 1st thru 4th Year Money & Energy Savings Results
Total Elec. for lights, cooking, GHP
1st Year 2nd Year 3rd Year 4 th Y ear
Total SF = 6000 6000 6000 6000
Total kWh = 22945 21573 23054 23607
Aver. kWh/day = 63 60 62 64
GHP Cost $45,321
Conv Cost $30,000
Tax credit 30% +$200/ton
Final cost $29,922
Total Electric for year $ = $1,742 $1,802 $1,872 $2,019
Average Monthly Electric Bill = $145 $150 $156 $168
Average Monthly kWh = 1,912 1,798 1,874 1,967
Average Cost Per Day = $4.82 $4.90 $5.13 $5.53
Plug Load = $92 $77 $83 $88
Geothermal Heat Pump System
Cost Average mo. Electric for
GHP
*Average mo elec bill – Plug Load = $53 $73 $73 $80
Total Elec for GHP 1st yr= $636 $876 $876 $960
Average Cost Per Day = $1.74 $2.40 $2.40 $2.63
Average Cost Per SF/year= $0.11 $0.15 $0.15 $0.16
*Projected cost per month $80 GHP Actual average cost per month $66
*Projected cost per month $80 GHP Actual average cost per month $70

26. 4 year Comparison Total Electric Cost/Month
26
Winter Rates Oct-Apr
2013-2014
Aver. $168/mo.
$.09376/kWh >600 kWh =$.05727/kWh
2011-2012
Aver. $150/mo.
Summer Rates May –Sep
$.10126/kWh
2010-2011
Aver. $145/mo.
2012-2013
Aver. $156/mo.
Cost/Month

27. 27
3708 W. Deer Crossing Dr, Stillwater, OK
New Construction 2010
Ground Source Heat Pump
More Details can be found at http://www.youtube.com
Search for IGSHPA and videos listed as Home 1-6

28. Accredited Installer Workshop
IGSHPA Stillwater, OK
• The three day comprehensive Installation
Workshops are designed for GHP
developers, architects, manufacturers,
distributors, dealers, installers, HVAC
contractors, trenching/drilling contractors,
and anyone who desires a working
knowledge of this innovative technology.
http://www.igshpa.okstate.edu/training/accredited.htm
Call 800-626-4747

29. Accredited Driller Workshop
IGSHPA, Stillwater, OK
• This workshop will train individuals on proper
construction and completion methods for vertical
GeoExchange boreholes. Accreditation as an
“Accredited Vertical Loop Installer”
• Who should attend? Water Well Drillers, Water Well
Contractors, Drilling Company Administrators
• Applications of Production Drilling and Borehole
Construction for GeoExchange Systems course
http://www.igshpa.okstate.edu/training/drillers.htm
Call 800-626-4747

30. Certified GeoExchange Designer (CGD)
PLUS and Online Course, IGSHPA, Stillwater
• From an introduction to the technology to a
complete review of the design process,
participants learn the specific information they
need to know to be a successful GeoExchange
Designer.
• As an architect or engineer or designer, you have
specific questions about GHP systems that you
want answered.
• CGD Certification is offered by IGSHPA and AEE
as an industry standard.
http://www.igshpa.okstate.edu/training/cgd.htm
Call 800-626-4747