The Building Science Podcast

Positive Energy

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In their own words

The Building Science Podcast is a show hosted by MEP engineering firm Positive Energy principal Kristof Irwin. The show covers everything from the basics of building science to adjacent scientific disciplines to more fully understand how the built environment shapes our lives as human beings on planet earth.

As heard by us

Based on 5 episodes we listened to · September 2026

It connects HVAC design, indoor microbes and human health while preserving the practical detail and scientific uncertainty behind each subject.

The Building Science Podcast treats a house as a system of heat, air, water, microbes and human consequences. Christophe Irwin works through these connections in detailed interviews, asking guests to explain both the mechanisms and the practical decisions they create for…

Read our full review in PlayNext →

Why you'd press play

A new house can take on your microbial signature within days; you've moved in twice.

Press play if you want

  • Kristof Irwin to explain why one kind of heat pump sends water into the house
  • a careful conversation about symptoms that might, or might not, come from your home
Read the full recommendation in PlayNext →

Talks about

Best episodes of The Building Science Podcast

Short reviews from the PlayNext desk, based on the episodes we processed.

(Un)Healthy HomesApr 8, 2026

A careful conversation about indoor environments, contested symptoms, and why mold is not an all-purpose answer.

Indoor air becomes a medical and social question as Christophe Irwin speaks with Dr. Eva King about the ways indoor environments may contribute to chronic disease.

Our Second PSA, The Humid Climate Conference in Austin May 4th & 5th!Mar 23, 2026

A compact Austin conference preview about moving building ideas into visible practice.

The Building Science Podcast frames the Humid Climate Conference in Austin on May 4 and 5 as more than a calendar notice. Christophe Irwin's conversation with Andy Weber and Caitlin Kautz, both part of the planning and organizing committee, gives the event's tenth year a…

Our Hidden RoommatesFeb 12, 2026

A measured look at how indoor spaces are shaped by the life already moving through them.

The Building Science Podcast treats the indoor microbiome as a plain fact of life: homes are not sealed boxes, and people, pets, plants, food, water, and routines all leave a mark. Dr.

Hydronics: The OG HVAC - Part 2Jan 27, 2026

A grounded conversation on why HVAC habits persist, and what hydronics could make possible next.

Hydronics: The OG HVAC - Part 2 opens with control systems, then moves into the refrigerant transition, using installer worries about flare fittings, fully charged systems, refrigerants, and glycol to explain why familiar HVAC habits can be hard to shake.

Hydronics: The OG HVAC - Part 1Dec 23, 2025

A focused look at heat pump based hydronic systems with practical technical context.

This episode stays centered on heat pump based hydronic systems, with Christoph Irwin and Ben Jewell walking through hydronics in the U.S. and Europe before turning to how air-to-water systems work.

Podcasts like The Building Science Podcast

Episodes

  1. 1

    (Un)Healthy Homes

    Hidden gem

    Host Kristof Irwin introduces a discussion with Dr.

    Apr 8, 2026·1h 16m·2 clips
  2. 2

    Our Second PSA, The Humid Climate Conference in Austin May 4th & 5th!

    Hidden gem

    The episode promotes the upcoming Humid Climate Conference, discussing its theme and introducing the planning committee members.

    Mar 23, 2026·17m·1 clip
  3. 3

    Our Hidden Roommates

    Building science host interviews Dr.

    Feb 12, 2026·1h 4m·4 clips
  4. 4

    Hydronics: The OG HVAC - Part 2

    Hidden gem

    Interview with Ben Jewell of Carrier Hydronics discussing control systems, refrigerants, and future-proofing in HVAC.

    Jan 27, 2026·1h 22m·2 clips
  5. 5

    Buildings as Habitat: Biodiversity-Informed Investments in Public Health

    An interview about biophilic design and passive house principles, hosted by a building science expert.

    Jan 20, 2026·1h 17m
  6. 6

    Hydronics: The OG HVAC - Part 1

    Dec 23, 2025·1h 24m·4 clips
  7. 7

    Beyond the View

    An interview with Andy Dryden about the importance of windows in building design, covering aesthetics, energy use, and high-performance window technology.

    Dec 1, 2025·1h 31m
  8. 8

    Cementing Carbon

    Oct 31, 2025·1h 1m
  9. 9

    Systems Thinking to Save the World - 50 Years of Serious Commotion

    Oct 21, 2025·1h 25m
  10. 10

    Navigating the Path to Passive

    Sep 27, 2025·1h 8m
  11. 11

    Blurring the Edges Between Inside and Out

    Aug 18, 2025·1h 16m
  12. 12

    Commissioning Matters

    Aug 4, 2025·1h 15m
  13. 13

    Architectural Epidemiology

    Jul 7, 2025·1h 17m
  14. 14

    Design Matters: Aesthetics, Ethics, and Architectural Impact

    May 29, 2025·1h 4m
  15. 15

    Architecture of Risk: Managing Liability & Uncertainty in the AEC

    Apr 30, 2025·1h 7m
  16. 16

    Building the Movement

    Apr 10, 2025·1h 1m
  17. 17

    Sustainability & Climate Wordcraft

    Christoph Irwin and Chell Anderson examine sustainability language, including net zero, embodied carbon, circular economy, electrification, resilience, and adaptation.

    Mar 20, 2025·1h 29m·2 clips
  18. 18

    Telling Better Stories

    Feb 26, 2025·1h 16m
  19. 19

    Architecture Out of Balance

    Dec 7, 2024·1h 15m
  20. 20

    An Architectural Optimist Wrote a Book - Part 3, Causing Good Design to Happen

    Nov 19, 2024·1h 15m
  21. 21

    Designer Desiccants, Molecular Filters, and Lots Of Dehumidification

    Nov 4, 2024·1h 6m
  22. 22

    Unlocking Electrification with Passive Buildlings

    An interview with Lisa White about the role of building enclosures in electrification, focusing on the human factor and avoiding a narrow focus on heat pumps.

    Oct 9, 2024·1h 15m
  23. 23

    More Influence, More Impact, More Satisfaction

    Sep 8, 2024·1h 25m
  24. 24

    Tools for a Habitable Future

    Aug 16, 2024·1h 20m
  25. 25

    Rethinking the Wood Supply Chain

    Jul 29, 2024·48m
  26. 26

    Modular Part 2 - Working Skillfully Within Constraint

    This episode discusses modular construction as a key incubator for rethinking AEC imperatives and connecting design intent to what is built.

    Jul 9, 2024·47m
  27. 27

    Modular Part 1 - It doesn't have to be so *$%! Hard!

    Jul 2, 2024·52m
  28. 28

    Pickleball Goes Passive

    Jun 11, 2024·58m
  29. 29

    Is There a Passive House Aesthetic?

    May 23, 2024·1h 7m
  30. 30

    Our First PSA, Humid Climate Conference in Austin, May 6-7!

    May 1, 2024·11m
  31. 31

    Ultrasonics Comes to Market

    Apr 22, 2024·1h 7m
  32. 32

    Next Level Leverage

    Apr 10, 2024·59m
  33. 33

    Houses are Made of Stories

    Mar 26, 2024·1h 17m
  34. 34

    Entropy, Insight and Our Time to Shine

    Mar 12, 2024·1h 14m
  35. 35

    Wood is Good?

    Mar 1, 2024·1h 25m
  36. 36

    Circles All the Way Down

    Feb 13, 2024·1h 17m
  37. 37

    Air-To-Water: Hydronic Hype or the Future?

    Jan 24, 2024·1h 19m
  38. 38

    Not Your Grandpa's Home Improvement Show

    Jan 16, 2024·51m
  39. 39

    Excuse Me, Your Coil is Leaking

    Dec 18, 2023·1h 20m
  40. 40

    Healthy Home Revolution

    Dec 1, 2023·1h 4m
  41. 41

    Green Glop and Ham Shirts

    Nov 27, 2023·1h 5m
  42. 42

    An Architectural Optimist Wrote a Book Part 2: Practice

    Nov 21, 2023·1h 20m
  43. 43

    Filter Feast Part 2

    Nov 7, 2023·55m
  44. 44

    Filter Feast Part 1

    Oct 18, 2023·55m
  45. 45

    The “Roaring 20s” for IAQ

    Sep 26, 2023·1h 15m
  46. 46

    An Architectural Optimist Wrote a Book

    Sep 11, 2023·1h 7m
  47. 47

    Making Quality Homes A(a)ffordable?

    Aug 25, 2023·53m
  48. 48

    The Future of Homes

    Aug 17, 2023·1h 18m
  49. 49

    Hempcrete Homes: A Growing Industry

    Aug 9, 2023·1h 15m
  50. 50

    Architectural Solar: A New Normal

    Aug 2, 2023·1h 8m
  51. 51

    Build. Not too much. Mostly with plants.

    Host Kristof Irwin interviews Greg Esparza about industry evolution and a project using CLT, foam, and concrete.

    Jul 19, 2023·1h 22m
  52. 52

    Building Science Journalism

    Christophe Irwin interviews Fine Home Building editorial director Brian Pontalillo and freelance editor Aaron Fagan about building-science journalism and editorial practice.

    Jul 12, 2023·1h 29m·2 clips
  53. 53

    Low Carbon Buildings - What's Next? Wow. Just Wow.

    Jul 5, 2023·56m
  54. 54

    Direct DC-to-LED Lighting (Bonus Short Episode)

    Jun 30, 2023·21m
  55. 55

    An Introduction to Embodied Carbon & Buildings

    Jun 28, 2023·1h 14m
  56. 56

    Do you like it hot? Do you want it now? Do you want it to last forever?

    Jun 21, 2023·1h 20m
  57. 57

    Building Passion For Passive

    Nov 4, 2022·1h 3m
  58. 58

    Proving Passive House Is Practical, Possible, & Promising (In Climate Zone 2A)

    Sep 26, 2022·1h 5m
  59. 59

    The Business of Building Science

    Jan 12, 2022·59m
  60. 60

    Energy With Memory

    An exploration of how to build wisely by integrating building science with systems ecology to ensure future generations have a high quality of life.

    Nov 9, 2021·1h 12m
  61. 61

    PFAS In Building Products

    An interview with Dr.

    Nov 4, 2021·53m
  62. 62

    Keep It Dry !

    Nov 4, 2021·1h 9m
  63. 63

    Zen & The Art of Continuous IAQ Modeling

    Jun 23, 2021·59m
  64. 64

    To Grow A Home, To Grow A Future

    May 3, 2021·1h 22m
  65. 65

    One Wheel Down & The Axle Dragging: The Texas Grid Failure Explained

    Mar 10, 2021·1h 11m
  66. 66

    Indoor Data Quality

    Feb 1, 2021·1h 10m
  67. 67

    What Would This Old House Say?

    Nov 20, 2020·59m
  68. 68

    "Faster Horses" & The Future Of HVAC

    Oct 23, 2020·1h 18m
  69. 69

    Through The Looking Glass Of High Performance Windows

    Sep 23, 2020·59m
  70. 70

    Ventilation & Virus Transmission (And Other Topics Too)

    Aug 7, 2020·1h 13m
  71. 71

    The Westford Summer Camp Blues

    Aug 3, 2020·1h 5m
  72. 72

    Obsessed With Humidity

    Jul 18, 2020·1h 1m
  73. 73

    Constructal Law Meets Building Science - Flow Systems Are Everywhere

    Jun 5, 2020·1h 12m
  74. 74

    Stewardship & The Future of Engineering

    May 29, 2020·1h 7m
  75. 75

    Passive House Accelerator

    Apr 3, 2020·47m
  76. 76

    A House Needs To Breathe... Or Does It?

    Mar 31, 2020·54m
  77. 77

    The 5 Principles Of A Healthy Home - Start With A Good Enclosure

    Mar 24, 2020·1h 17m
  78. 78

    2019: Looking Back & Looking Forward

    Dec 20, 2019·35m
  79. 79

    Death Of The Suburbs: An Urban Manifesto

    Dec 9, 2019·1h 3m
  80. 80

    Carbon Fluency

    Nov 23, 2019·1h 9m
  81. 81

    The Insulation Decision

    Nov 9, 2019·1h
  82. 82

    The V In HVAC - Part 2

    Oct 5, 2019·50m
  83. 83

    The V In HVAC - Part 1

    Jul 19, 2019·1h 2m
  84. 84

    That's How The Light Gets In

    Jun 14, 2019·1h 21m
  85. 85

    Fix-A-Flat For Houses?

    May 7, 2019·58m
  86. 86

    Don't Just Build A House. Build A Legacy.

    Apr 5, 2019·53m
  87. 87

    Just Don't Tell Them It's Passive House!

    Mar 22, 2019·56m
  88. 88

    End Game Refrigerants

    Mar 8, 2019·53m
  89. 89

    You Don't Know What You Don't Know, You Know?

    Feb 15, 2019·1h 2m
  90. 90

    Texas Goes Passive

    Jan 31, 2019·1h 9m
  91. 91

    There's What In This Building?!

    Jan 14, 2019
  92. 92

    Breathe Like You Mean It

    Dec 21, 2018·1h 28m
  93. 93

    Season 5 Preview

    Dec 17, 2018·12m
  94. 94

    Do You Have 2030 Commitment Issues?

    Dec 7, 2018·1h 2m
  95. 95

    3 Hot Topics Served Crunchy

    Nov 16, 2018·1h 5m
  96. 96

    What Do Spec Homes Dream Of?

    Oct 26, 2018·51m
  97. 97

    Excuse Me, Your Building Is Leaking

    Oct 5, 2018·55m
  98. 98

    What The Heck Is HOMEChem?

    Sep 20, 2018·42m
  99. 99

    5 Principles Of A Healthy Home

    Aug 31, 2018·1h 9m
  100. 100

    The Building Science Podcast Presents: The Edifice Complex

    Aug 17, 2018·1h 5m
  101. 101

    The Building Science Podcast Presents: The Build Show

    Jul 31, 2018·21m
  102. 102

    Inside The Mind Of An HVAC Contractor (Or Two)

    Jul 27, 2018·1h 7m
  103. 103

    Locavore Dirt Construction?

    Jul 13, 2018·59m
  104. 104

    Use Your Tools - The New COTE Toolkit

    Jun 29, 2018·1h 8m
  105. 105

    Welcome To The Filtration Station

    Jun 15, 2018·51m
  106. 106

    Let's Get Legal-ish

    Jun 1, 2018·1h 3m
  107. 107

    Circus Or Symphony

    May 18, 2018·58m
  108. 108

    Dirty Socks & Your HVAC Coil

    May 4, 2018·45m
  109. 109

    Architectural Yogurt

    Apr 20, 2018·50m
  110. 110

    Our Homes, Our Health

    Apr 6, 2018·57m
  111. 111

    Respect The Trade, Build The Craft

    Mar 23, 2018·22m
  112. 112

    The Future Of Water Heating Is Here

    Mar 9, 2018·33m
  113. 113

    Forget What You Know About Buildings: An Interview With Kiel Moe

    Feb 23, 2018·45m
  114. 114

    The Secret Life Of Concrete

    Feb 6, 2018·1h 9m
  115. 115

    Design & Construction In Humid Climates

    Jan 26, 2018·30m
  116. 116

    Don't Wait For The Market

    Jan 12, 2018·1h 3m
  117. 117

    The Beauty Of Hot Water

    Dec 22, 2017·42m
  118. 118

    The Beauty Of A Healthy Building

    Dec 20, 2017·14m
  119. 119

    The Beauty Of Climate Appropriate Design

    Dec 18, 2017·32m
  120. 120

    The Beauty Of Urban Infill

    Dec 15, 2017·20m
  121. 121

    Season 3 Reflections | Season 4 Preview

    Dec 12, 2017·9m
  122. 122

    The Beauty Of Performance

    Dec 7, 2017·42m
  123. 123

    Knowing & Using VRF

    Nov 11, 2017
  124. 124

    Stucco - (Much) More Than Meets The Eye

    Oct 6, 2017·59m
  125. 125

    Intelligent Environments: Building Science & Predictive Analytics Collide

    Aug 18, 2017·46m
  126. 126

    Hitting The Reset Button

    Aug 7, 2017·45m
  127. 127

    Everything You Never Knew About Earthen Construction

    Aug 1, 2017·52m
  128. 128

    IEQ Series - Hearing Architecture & ISQ

    Jun 19, 2017·55m
  129. 129

    Efficiency Is Not Enough - The Science Of Sustainability

    May 23, 2017·57m
  130. 130

    Ducts & Sealing & Health, Oh My!

    Apr 25, 2017·1h 7m
  131. 131

    An Interview With John Semmelhack Of Think Little

    Apr 4, 2017·1h 4m
  132. 132

    IEQ Series - Seeing Architecture & ILQ

    Mar 6, 2017·1h 6m
  133. 133

    Why VRF Matters

    Feb 13, 2017·49m
  134. 134

    Humidity, Attics, & Spray Foam, Oh My!

    Dec 1, 2016·52m
  135. 135

    A Haunting HVAC Tale - Halloween Podcast Short

    Oct 31, 2016·4m
  136. 136

    IEQ Series - Thermal Comfort With Robert Bean (Part 2)

    Oct 21, 2016·48m
  137. 137

    IEQ Series, Part 1 - Thermal Comfort With Robert Bean

    Oct 11, 2016·46m
  138. 138

    IEQ Series - An Introduction

    Aug 22, 2016·39m
  139. 139

    Water, Buildings & The Fourth State Of Matter

    Jun 23, 2016·34m
  140. 140

    Better Shelter - An Interview With Jason Ballard

    Apr 29, 2016·43m
  141. 141

    Delivering Better Buildings - A Discussion On Integrated Project Delivery

    Mar 28, 2016·44m
  142. 142

    On The Road Again - The Basics Of Vapor Compression

    Mar 11, 2016·29m
  143. 143

    Bearing Witness & The Path To Better Construction

    Mar 11, 2016·49m
  144. 144

    Construction Practices & Public Health

    Jan 26, 2016·42m
  145. 145

    Radiant Cooling & Heating With Messana

    Jan 15, 2016·33m
  146. 146

    An Interview With Dr. Allison Bailes III

    Jan 12, 2016·34m
  147. 147

    Living Inside Anywhere, Part 5

    Dec 9, 2015·41m
  148. 148

    Living Inside Anywhere, Part 4

    Nov 24, 2015·33m
  149. 149

    Living Inside Anywhere, Part 3

    Nov 19, 2015·29m
  150. 150

    Living Inside Anywhere, Part 2

    Nov 12, 2015·49m
  151. 151

    Living Inside Anywhere, Part 1

    Nov 4, 2015·26m
  152. 152

    Attic Ventilation

    Sep 30, 2015·19m
  153. 153

    Comfort, Health, & The Basics of HVAC

    Sep 1, 2015·58m
  154. 154

    Micro/Macro Perspectives: Short

    Aug 31, 2015·10m
  155. 155

    Passive House At A Glance

    Jul 17, 2015·43m
  156. 156

    A Brief History Of Air Conditioning

    Jun 19, 2015·32m
  157. 157

    Radiant Heating & Cooling (Thermally Active Surfaces)

    Jun 19, 2015·32m
  158. 158

    Glazing & Comfort

    Jun 10, 2015·35m
  159. 159

    Phase Change Materials

    May 27, 2015·21m