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SpohnHome presentation @ 2021 HVACR Symposium

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SYSTEMS USED AND LESSONS LEARNED


BUILDING A HIGH PERFORMANCE HOME




OR WHAT’S IT LIKE LIVING INSIDE YOUR THEORIES
BILL...

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A FAVOR TO ASK:


SEND BILL INTO SPACE
• WATCH & SHARE BILL’S CONTEST VIDEO


• TWITTER: WWW.BIT.LY/SPOHNSPACE-TW


• FACE...

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BILL SPOHN
• 1988 – 1998
	
BACHARACH, INC.


• 1999 – 2009
	
TESTO, INC.


• 2009 – NOW
	
TRUTECHTOOLS, LTD


• BS & MS ME...

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SpohnHome presentation @ 2021 HVACR Symposium

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Bill Spohn takes you on his journey of building his house "with ideas stolen from the future." Not a Passive House, definitely running on solar, maybe a Net-Zero House (time and testing will tell). But certainly, it is what he defines as a Personalized Performance Home that is pretty/handsome, very comfortable with superb Indoor Air Quality (IAQ) and uses energy responsibly: it's the SpohnHome.

Bill Spohn takes you on his journey of building his house "with ideas stolen from the future." Not a Passive House, definitely running on solar, maybe a Net-Zero House (time and testing will tell). But certainly, it is what he defines as a Personalized Performance Home that is pretty/handsome, very comfortable with superb Indoor Air Quality (IAQ) and uses energy responsibly: it's the SpohnHome.

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SpohnHome presentation @ 2021 HVACR Symposium

  1. 1. SYSTEMS USED AND LESSONS LEARNED 
 BUILDING A HIGH PERFORMANCE HOME 
 
 OR WHAT’S IT LIKE LIVING INSIDE YOUR THEORIES BILL SPOHN HVACR SCHOOL 2021 SYMPOSIUM MARCH 12, 2021
  2. 2. A FAVOR TO ASK: 
 SEND BILL INTO SPACE • WATCH & SHARE BILL’S CONTEST VIDEO • TWITTER: WWW.BIT.LY/SPOHNSPACE-TW • FACEBOOK: WWW.BIT.LY/SPOHNSPACE-FB • LINKEDIN: WWW.BIT.LY/SPOHNSPACE-LI • YOUTUBE: WWW.BIT.LY/SPOHNSPACE-YT • INSTAGRAM: WWW.BIT.LY/SPOHNSPACE-IG Video produced by Joe Medosch ->
  3. 3. BILL SPOHN • 1988 – 1998 BACHARACH, INC. • 1999 – 2009 TESTO, INC. • 2009 – NOW TRUTECHTOOLS, LTD • BS & MS MECHANICAL ENGINEERING • PROFESSIONAL ENGINEERING LICENSE • TECHNICAL STANDARDS COMMITTEE MEMBER • CONSULTANT, TRAINER • PODCASTER: • BUILDING HVAC SCIENCE • RESTALK 2019 I’m not a builder!
  4. 4. WE ALL KNOW WHAT A HOME IS, BUT…. • WHAT IS PERFORMANCE? • COMFORT • SAFETY • HEALTH • IAQ • ENERGY • RATING • WHAT IS PERFORMANCE? • SUSTAINABILITY • DURABILITY • GREEN • CLIMATE CHANGE • BUDGET • CODE • ? Performance is personal Meets your needs. Aligns with your understanding. Gives you what you want. At a price you can afford.
  5. 5. OUR GOALS • FLATTER THE NATURAL VIEW • HAVE SPACE FOR A LARGE GARDEN • A HOUSE WE WANT TO LIVE IN • STYLE: HANDSOME OR PRETTY • FUNCTIONAL: ONE FLOOR LIVING, FOREVER HOME • COMFORTABLE & HEALTHY • ENERGY EFFICIENT & ENVIRONMENTALLY RESPONSIBLE • FUTURE-PROOF Nov 2018 June 2020
  6. 6. GOALS FOR OUR HOME • FLATTER THE VIEW • VERY COMFORTABLE • FUNCTIONAL FOR US • SUPERB IAQ • ALL ELECTRIC – SOLAR POWERED • ROOM FOR A LARGE GARDEN • ENVIRONMENTALLY RESPONSIBLE
  7. 7. US DOE Climate Zone MAP Based on heating degree-days, average temperatures,
  8. 8. INFLUENCERS FROM MY NETWORK • HOME ENERGY – HOUSE AS A SYSTEM • LINDA WIGINGTON • HELEN PERRINE • A PATTERN LANGUAGE • CHRIS DORSI • “DESIGN FOR PEOPLE, GOOD BUILDINGS FOLLOW” • ROBERT BEAN • PASSIVE HOUSE CONCEPTS • KNUT HOYER • PRACTICAL PASSIVE • RHETT MAJOR • ALL ELECTRIC • NATE ADAMS
  9. 9. • CONTINUOUS INSULATION & NO THERMAL BRIDGES • AIRTIGHT CONSTRUCTION • HIGH PERFORMANCE WINDOWS • DOUBLE PANES ALLOWED • MANAGE SOLAR GAIN • SHADING • HRV/ERV • MINIMAL HVAC SYSTEM From www.phius.org “It’s about control.” www.HomeDiagnosis.tv
  10. 10. PRACTICAL PASSIVE • RHETT MAJOR • LOCAL EXPERT • PASSIVE HOUSE TRADE INSTRUCTOR • TRAINED IN AUSTRIA • OUR CONSTRUCTION CONSULTANT • KEEPING PASSIVE WINDOWS • AIR SEALING DETAILS • THERMAL BRIDGING • HEATED BATHROOM FLOOR
  11. 11. MODULAR CONSTRUCTION • ECOCRAFT HOMES • THRU RESEARCH FOR PASSIVE HOUSE BUILDER • THE ONLY ONE IN OUR AREA! • VALIDATION OF THEIR WORK: • IBACOS- HOME CONSTRUCTION RESEARCH FIRM • OWNER BUILT HIS OWN MODULAR • BILL & RHETT TEST THE HOUSE HE LIVES IN • MODULAR IS THEIR ONLY MODE • PUSHING THE ENVELOPE OF THE BUILDER AND FACTORY WITH SOME COMPROMISES
  12. 12. SMI - STRUCTURAL MODULARS INC. ROAD TRIP!!!! 77 miles from factory to house site Built to withstand a Richter 7 earthquake
  13. 13. BENEFITS OF FACTORY BUILT • JIGS AND FIXTURES – IT MUST LINE UP LATER! • CONSISTENT WORKFORCE • WORK TO COMES TO THE WORKERS & QA • MATERIALS ARE ALWAYS PROTECTED INSIDE • WWW.BIT.LY/HOUSES-LIKE-CARS • MODULES ARE FAIRLY OPEN, OUT-GASSING HAPPENS BEFORE DELIVERY • WALLS ARE BUILT FROM INSIDE OUT, ALLOWING FOR BETTER AIR SEALING • WORK IS DONE FROM ALL 6 SIDES AT ONCE • OVERBUILT - HOUSE MUST BE FIT FOR A ROAD TRIP (7 ON THE RICHTER SCALE) • LESS WASTE THAN SITE BUILT
  14. 14. ALL ELECTRIC HOME • IT’S THE WAY OF THE FUTURE • HEAT PUMP HEATING AND COOLING • INDUCTION COOK TOP • HEAT PUMP WATER HEATER • HEAT PUMP CLOTHES DRYER • ELECTRIC FIREPLACE • HEATED FLOOR IN MASTER BATHROOM INFLUENCED BY NATE ADAMS WWW.NATETHEHOUSEWHISPERER.COM
  15. 15. First Floor Plan Hot & cold water usage Efficient Plumbing Plan
  16. 16. Second Floor Plan Hot & cold water usage
  17. 17. Basement Future powder room and kitchenette in basement
  18. 18. Typical Hot Water Routing plan IMPROVED
  19. 19. • HVAC • DUCT LAYOUT • RETURN SIZING • CONDITIONING ERV • LOAD CALCULATIONS: MANUAL J VS PHPP • 4 ZONE - DUCTED MINI SPLIT • AIR SOURCE HEAT PUMP (ASHP) • MINIMAL SPACE CONDITIONING
  20. 20. PASSIVE 
 HOUSE 
 PLANNING 
 PACKAGE 
 (PHPP) 
 ENERGY MODEL 
 
 ALLOWS FOR EASY SWAP IN/ OUT OF COMPONENTS
  21. 21. KWIK MODEL • TOTAL HEAT LOSS = 41,214 (ABOUT 45% OF THAT IS THE BASEMENT) • SENSIBLE HEAT GAIN = 19,962 (ALMOST NONE OF THAT IS THE BASEMENT) • LATENT HEAT GAIN = 5,962 (ALMOST NONE IN THE BASEMENT) • TOTAL HEAT GAIN = 25,924
  22. 22. COMPARING MODELS Model Total Heat Loss Sensible Heat Gain Latent Heat Gain Total Heat Gain Sq Ft Basement included? Kwik Model 41,214 (22,668) 19,962 5,962 25,924 4,480 Yes Manual J 24,555 19,217 1,900 21,118 2,880 No PHPP 24,850 9,523 3,720 No
  23. 23. AIR INFILTRATION TEST • BLOWER DOOR TEST • ACH 50 • AIR CHANGES PER HOUR AT 50 PASCALS TEST PRESSURE • OUR GOAL WAS 1.0 ACH50 • CURRENTLY AT 1.1
  24. 24. IT’S ABOUT THE DETAILS • AVOID THERMAL BRIDGING IN WINDOW FRAMING • AVOID AIR LEAKAGE BY TAPING MATERIAL SEAMS/JOINTS
  25. 25. INFILTRATION • NO FUEL BURNING APPLIANCES • EXTREME AIRSEALING DETAIL • PLUMBING STACK VENTS • WINDOWS • OUTLETS • HEAT PUMP CLOTHES DRYER • ATTIC HATCH AIR SEALING • STANDARD RANGE HOOD • OUTSIDE EXHAUST • BUILT IN TO MICROWAVE
  26. 26. MIND THE RADON
  27. 27. SOLAR POWER • 12 KW ARRAY • NREL SITE PRODUCTION ESTIMATE 14.7 KWH AC • EXISTING “FIXED” 1980 HOME • +GAS SPACE AND WATER HEATING • ANNUAL USAGE 7200 KWH ELECTRIC ONLY • WHY THE EXCESS? • NET METERING • FUTURE ELECTRIC VEHICLE CHARGING • TAKING ADVANTAGE OF • LOCAL SOLAR COOP PRICING • ONE AND DONE PERMITTING • SRECS • POSSIBLE (FUTURE) COMMUNITY SOLAR
  28. 28. FACTORY PHOTOS
  29. 29. MY RESEARCH LEADING TO MY PRACTICE
  30. 30. Construction dust being vacuumed up
  31. 31. • Wall Cross section • Wall Board • 2x6 24” OC • Unbacked Fiberglas • Zip Wall taped • Airtight construction • 1.5” Neopor graphite impregnated EPS • Continuous insulation • Solitex Mento WRB • Architectural vinyl siding • R-30
  32. 32. Vaulted area has a temporary floor
  33. 33. • Roof flips for transportation • Reuse of excess Zip Wall
  34. 34. “You do know you have 9 rooflines, Mr. Spohn?” - Kevin , SMI Factory Supervisor
  35. 35. 4 boxes Largest 64 ft long 14 ft wide Height on trailer 14.5 ft Work happens from all 6 sides
  36. 36. JIGS 
 
 LASER 
 ALIGNMENT
  37. 37. BENEFITS OF FACTORY BUILT • CONSISTENT WORKFORCE – ASSEMBLY LINE • WORK TO COMES TO THE WORKERS, CONSTANT QA • OVERHEAD CRANES • MATERIALS ARE ALWAYS PROTECTED INSIDE • WWW.BIT.LY/HOUSES-LIKE-CARS • MODULES ARE FAIRLY OPEN, OUT-GASSING HAPPENS BEFORE DELIVERY • WALLS ARE BUILT FROM INSIDE OUT, ALLOWING FOR BETTER AIR SEALING • WORK IS DONE FROM ALL 6 SIDES AT ONCE • OVERBUILT - HOUSE MUST BE FIT FOR A ROAD TRIP (7 ON THE RICHTER SCALE) • 10-20% OF CONSTRUCTION HAPPENS OUTSIDE THE FACTORY
  38. 38. Wall Cross section • Wall Board • 2x6 16” OC studs • Unbacked Fiberglas • Zip Wall taped with fastener heads puttied with sealant • 1.5” Opcore graphite impregnated EPS • Solitex Mento 1000 WRB • WRB taped • Architectural vinyl siding • Walls: R-28 • Roof: R-45 • Foundation: R-30 • Windows: R-6.6 (U=0.15) • Doors: R-12.5 (U=0.08)
  39. 39. NEOPORE WORKS BETTER AT LOWER TEMPERATURES 
 
 WE USED 1.5” 
 R7.0 @ 75F 
 R7.3 @ 40F 
 R7.6 @ 25F
  40. 40. SMI - STRUCTURAL MODULARS INC. 77 miles from factory to house site The Team that build our house 30 years in business
  41. 41. FOUNDATION • SPECIALTY PRECAST WALL SYSTEM • FOAM • STEEL • MONOLITHIC POUR OF FIBER REINFORCED CONCRETE • 8.5” FOAM, 2.5” EXTERIOR • FACTORY-MADE
  42. 42. The 4 modules each weighing from 10-15 Tons were set on the foundation on January 20, 2020
  43. 43. FUNCTIONAL: Single floor living Breezeway to garage on same level Walk out to deck in back on same level
  44. 44. GOAL: Does it flatter the view? GOAL: Is it pretty/handsome? GOAL: Room for a large garden?
  45. 45. 2870 Square feet on 2 floors plus 1600 Square Foot Basement Cost per Square foot in middle of range for a custom build
  46. 46. LARGE SOUTH FACING WINDOWS PRIMARILY IN OPEN SPACE FOR LIGHT AND SOLAR GAIN Uvalue 0.15 (old house0.28) SHGC 0.40 (old house 0.19)
  47. 47. Roof Style: Modify Cape Cod
  48. 48. MIELE CLOTHES WASH AND DRYER • LOTS OF TECHY FEATURES ON BOTH • HEAT PUMP CLOTHES DRYER • NO VENTING • 120 V OPERATION • SLIGHTLY LONGER RUN TIMES • MINIMAL ENERGY USE No venting chosen to control the house pressures / air leakage.
  49. 49. INSPECTIONS • EACH MODULE SEPARATELY INSPECTED BY A PA STATE INSPECTOR IN THE FACTORY • LOCAL CODE OFFICIAL EASILY SIGNED OFF • SEPTIC AND PLUMBING INSPECTIONS WERE A CHALLENGE • APPRAISERS DID NOT “GET IT”
  50. 50. REGIONAL WORK in PA EcoCraft Homes: Pittsburgh Structural Modular: Strattanville Energy Doctor: Irwin Specialty Precast: Prospect Adams Excavating: Prospect Ventana Windows: Export Envinity Solar, State College Dillan Well Drilling: Darlington CW Electrical Services, Pittsburg Dennis & Sons Plumbing, Pittsbu Pittsburgh Asphalt, Pittsburgh Strisna Cement, McDonald 84 Lumber, Mars 
 more..
  51. 51. Time Line Consider a future move JAN -14 OCT-19 Factory build Move to “5 Year” House JUL -14 Looking for land JAN -17 Buy land, Contract with PH Architect APR -18 Visit SMI Factory JUN -18 End PH Contract SEP -18 Begin Design w/ EcoCraft NOV -18 Signed Builder Contract AUG -19 NOV-20 Move in House set & on site finishing begins JAN -20 +4 SPEED BUMPS!
  52. 52. SPEED BUMP#1 • WHAT NO SEWER LINE? • SITING, TESTING, DESIGN, COUNTY HEALTH APPROVAL OF ON-LOT SEPTIC BEFORE EXCAVATION
  53. 53. SPEED BUMP#2 • COVID-19 • TEMPORARY WORK STOPPAGE BY GOVERNOR’S MANDATE • TEMPORARY HALT TO ON-SITE FINISHING OF CONSTRUCTION • TEMPORARY HALT TO DRILLING FOR WATER • DELAYING DELIVERY OF APPLIANCES AND FURNITURE • LAST 2 APPLIANCES ARRIVED ON DEC 4
  54. 54. SPEED BUMP#3 • WHERE’S THE WATER? • FIRST DRILLER USED CLASSIC CABLE TOOL METHOD- SLOW • HAD A GOOD WELL IN MAY, THAT FAILED TO PRODUCE IN JULY • DRILLED A 2ND WELL IN AUGUST WHICH FAILED • TRIED TO SEAL 1ST WELL IN AUGUST WHICH FAILED • SECOND DRILLER GOT GOOD WELL IN ONE DAY IN SEPTEMBER! • THIS DELAYED ORDERING A PLUMBING INSPECTION
  55. 55. SPEED BUMP#4 • COUNTY HEALTH DEPT PLUMBING INSPECTION • DEMANDED DISHWASHER BE INSTALLED – MINOR DELAY • WILL NOT SCHEDULE INSPECTION DUE TO OVERBOOKING • IN THE MIDST OF THIS 2 PLUMBING INSPECTORS ARRESTED ON FELONIES -ACCUSED OF FALSIFYING RECORDS
  56. 56. Specialty Precast Foundation Also Factory made Approx. R-30
  57. 57. DID WE ACHIEVE THE GOALS?
  58. 58. All Electric Home: Ducted Air Source Heat pump Induction cook top Heat Pump water heater Heat pump clothes dryer Solar power Performance governed by comfort <1 ACH50 Energy Model via PHPP & Manual J Solar shading on windows Conditioning ERV Keep track at www.SpohnHome.com
  59. 59. FUNCTIONAL: SINGLE FLOOR LIVING
  60. 60. FUNCTIONAL: Room for grandkids and guests
  61. 61. SENSI 
 WIFI THERMOSTATS
  62. 62. W H Water H&AC CE RV 2 FUNCTIONAL: Storage space, exercise room, extra office
  63. 63. • PRELIMINARY ON APRIL 30 • 1153 CFM50 (1.7 ACH50) • FIXES MADE • “READY” ON SEPT 3 • 789 CFM50 (1.2 ACH50) • FIXES MADE • FINAL: TBD BLOWER 
 DOOR 
 TESTS EFFICIENCY & COMFORT
  64. 64. EFFICIENCY AND COMFORT: HVAC SYSTEM • 2SEPARATELY DUCTED SYSTEMS • H & AC • V • MORE DETAILS HERE: HTTP://BIT.LY/ SPOHNHOME-HVAC
  65. 65. HEATING • SPACE HEATING ELECTRIC HEAT PUMP • BACK UP ELECTRICAL RESISTANCE • FUNCTIONS AS AC IN SUMMER • HEAT PUMP WATER HEATER • HEAT PUMP CLOTHES DRYER • INDUCTION RANGE
  66. 66. HAC Supplies Zone 1 Living room (3) Laundry (1) Dining room (2) Kitchen (3) HAC Supplies Zone 2 Master bath (2) Power room (1) Office (2) Entry hall (1) Master bedroom (2) 6x36 central return Z2-2 Z2-2 Z2-1 Z2-2 Z2-1 Z1-3 Z1-3 Z1-2 Z1-1 CERV Supplies Master bedroom (1) Living room (1) Office (1) CERV Returns Master bath (1) Power room (1) Kitchen (1) Laundry (1) CS CS CS CR CR CR CR
  67. 67. HAC Supplies Zone 2 Bathroom (1) Bedroom 2 (2) HAC Supplies Zone 4 Bedroom 3 (2) Lounge (5) CERV Supplies Bedroom 2 (1) Bedroom 3 (1) CERV Returns Bathroom (1) Attic closet (1) Z2 12x8 central return Z2 Z4 Z4 CS CS CR CR Bedroom2 Bedroom3
  68. 68. YET THE ZONES WERE CONNECTED DIFFERENTLY! • ZONE 1: 9 OUTLETS • ZONE 2: 11 OUTLETS • ZONE 3: 6? OUTLETS BASEMENT • ZONE 4: 7 OUTLETS • ZONE 1: • ZONE 2: • ZONE 3: • ZONE 4:
  69. 69. H/AC • 2 Ton Ducted ASHP • 21.5 SEER • 4 Zones • 4” Horizontally mounted MERV 11 • 10 kW Heat strips • 0.8 IWC AirHandler
  70. 70. DETTSON SMART DUCT www.bit.ly/SPOHNHOME-SMARTDUCT
  71. 71. CERV2 Comfort & EE • Conditioning ERV • 1/3 Ton heat pump • MERV 13 filters • Both air streams • It’s pretty SMART • Assesses air quality • Recirculation 1st • Fresh air brought in • Off when not needed • Mfd by BuildEquinox
  72. 72. CERV2 DATA PORTAL / APP • REALTIME CONTROL FROM ANYWHERE • ASSESSMENT OF POLLUTANT EXPOSURE VS. STANDARDS • REALTIME AND HISTORICAL MEASUREMENT DATA
  73. 73. CERV2 IAQ Data: SpohnHome Home is not yet occupied Lots of painting Green= Ventilating Pink= CO2 level Orange= VOC level
  74. 74. CERV2 Temp Data: SpohnHome Home is not yet occupied H&AC system most often turned off AirHandler set to 20% duty cycle in October
  75. 75. CERV2 Humidity Data: SpohnHome Home is not yet occupied H&AC system most often turned off Windows opened
  76. 76. MEANWHILE 
 OUTSIDE 
 …. H&AC: Dettson Heat Pump Outdoor Unit CERV2 SUPPLY CERV2 EXHAUST
  77. 77. COMFORT AND ENERGY EFFICIENCY: 
 APPLIANCES • ENERGYSTAR REFRIGERATOR AND DISHWASHER • INDUCTION RANGE • MICROWAVE WITH VENT HOOD COMBINATION • EURO-STYLE WASHER & DRYER • HEAT PUMP WATER HEATER Hole Control
  78. 78. ENVIRONMENTALLY RESPONSIBLE: 
 RAIN WATER HARVESTING • 116 GALLON CAPACITY OF NON-POTABLE WATER FOR OUTDOOR USES
  79. 79. 10 feet 10 feet 52 feet
  80. 80. NET METERING ELECTRICITY • ORANGE AREA SOLAR PRODUCTION • BLUE LINE CONSUMPTION
  81. 81. ENVIRONMENTALLY RESPONSIBLE: 
 SOLAR POWER • TECHNICAL DETAILS • 12 KW: 32 X 375 W TRINA PANELS • 2 SMA SUNNYBOY INVERTERS WITH SECUREPOWER • ECONOMIC BENEFIT • NET METERING • SOLAR RENEWABLE ENERGY CREDITS – SRECS • MEDIA COVERAGE • WWW.BIT.LY/SPOHNHOME-TRIB • WWW.BIT.LY/SPOHNHOME-TRIB1 • WWW.BIT.LY/SPOHNHOME-SOLARTOUR
  82. 82. Solar Production: SpohnHome 0 20 40 60 80 7/14/24 7/18/24 7/22/24 7/26/24 7/30/24 8/3/24 8/7/24 8/11/24 8/15/24 8/19/24 8/23/24 8/27/24 8/31/24 9/4/24 9/8/24 9/12/24 9/16/24 9/20/24 9/24/24 9/28/24 10/2/24 10/6/24 10/10/24 Net metering (kWh) Consumed Daily data missing Average per day used Inverters not yet reporting production Only 1 inverter reporting
  83. 83. NET METERING kWh Blower fan power + AC run to dehumidify after testing
  84. 84. SOLAR RENEWABLE ENERGY CREDITS: SRECS
  85. 85. OH WHAT IS AN SREC WORTH? PA DC
  86. 86. ISSUES AFTER MOVE IN
  87. 87. LEAKY WINDOWS
  88. 88. HEAT PUMP FAILURE Troubleshooting with coil outlet temperature trending
  89. 89. HEAT PUMP FAILURE CONCLUSION • DR. BERGMANN CAME OUT FOR A CHECK UP • TRIED TO EVACUATE, SHOWED SIGNS OF LOTS OF MOISTURE • HUNG UP AT 1350 MICRONS • CAUSE • CRACKED FLARE PULLED IN MOISTURE DURING HP MODE, NOT AC MODE • DESTROYED THE POE • “YOUR NEW CAR GOT TOTALED DRIVING IT OFF THE LOT.” • TOTAL REPLACEMENT OF REFRIGERANT CIRCUIT (2 COILS AND LINE SET)
  90. 90. SOLAR PANELS
  91. 91. ALL CONFOUNDING THE ROAD TO NET ZERO
  92. 92. STILL LOVING IT!
  93. 93. Watch TTT social media for an upcoming webinar on The HELIUM Network
  94. 94. QUESTIONS? • WWW.SPOHNHOME.COM • BILL@TRUTECHTOOLS.COM

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