Hot|Cool, the International District Energy Magazine

Why HOT|COOL?

Welcome to Hot|Cool, the premier district heating and cooling technology magazine. Each month, we bring you in-depth articles written by experienced professionals covering the latest ideas and developments in the field. With a readership of over 5,000 in over 70 countries, we are proud to be the go-to source for those who want to stay informed about state-of-the-art district heating and cooling. Our mission is to provide readers with the most comprehensive and up-to-date information and be the best district heating magazine in the world! If you’re passionate about district heating and cooling, you won’t want to miss an issue of Hot|Cool.

Subscribe for free here

Upcoming themes

Put your end-users first: The Customer is Always King!
Maintenance & Renovation

Put Your End-User First: the Customer is Always King!” HOT|COOL NO.6/2025

Editorial: CHILL: a pragmatic way to get to 100% renewable heat – faster By Morten Jordt Duedahl, DBDH
Ownership Matters for District Heating By Magnus Skovrind Pedersen, CEO at Think Tank Brundtland and Lasse Skou Lindstad, analyst at Think Tank Brundtland

Marine Energy for Low-Carbon District Heating By Per Skafte, CEO, Brugg Pipes
Podcast: Embedding Social Sustainability in the District Energy Business Model Moderator Hanne Kortegaard Støchkel, Project Development Manager at DBDH
A Holistic Approach to Correctly Evaluate Energy Efficiency in District Heating Systems By Oddgeir Gudmundsson, Director, Danfoss A/S, Climate Solutions, and Jan Eric Thorsen, Director, Danfoss A/S, Climate Solution

District Heating Sprouting Green HOT|COOL NO.5/2025

Editorial: Breaking the Insular Mindset – The Green Transtion Needs Cross-Border Thinking By Lars Gullev, Founder and CEO, Gullev DH Advisory

Third-Party Access to District Heating Networks By Dr. Jana Bosse, Senior Expert for Renewable Heat, dena, Dr. Rita Ehrig, Team Leader for Renewable Heat, dena, Carla Groß, Senior Expert for Energy Efficiency, dena, and Dr. Tim Mennel, Lead Expert for Market Design, dena
Closing the Loop: How Industrial Utility Symbiosis in Odense Forges a Blueprint for Decarbonisation By Ronak Monga, Head of Sales, Development CBS, District Energy, Grundfos
WaterWarmth Podcast Series: No. 2 Yes, in my Backyard! – How Local Energy Communities are powering the Green Heat Transition Moderator Lesia Logvynenko, Project Manager at DBDH
Replicability and Standardisation to Facilitate Time-Effective Decarbonisation By Jacek Kalina, Coordinator of the LIFE22-CET-SET_HEAT project, Silesian University of Technology
Member Company Profile: By Brugg Pipes

Recommendations for Implementing District Heating HOT|COOL Special Collection edition no. 1/2025

Editorial: Building a Sustainable Future: Why Municipalities Should Establish Their Own Heating Companies By Michiel de Wit, Process Manager District Heating at the Municipality Súdwest-Fryslân and Sacha de Haan, Process Leader heat transition at the
Municipality Súdwest-Fryslân
Duration Curves and How They Should Influence the Choice of Heat Production Capacity By Morten Jordt Duedahl, Business Development Manager, DBDH

Bjæverskov District Heating Company: Volunteer-led District Heating Company Brings Sustainable Warmth to 1,000 Buildings By Lars Gullev, VEKS
Seawater Heat Pump: First Operational Experience from a Megaproject in Esbjerg, DK By Claus A. Nielsen, Raymond Decorvet and Tommy Mølbak
District Heating: Europe’s Way to Security and Competitiveness By Magnus Skovrind Pedersen and Lasse Skou Lindstad
Geothermal Energy: Revolutionizing District Heating for a Sustainable Future By Søren Berg Lorenzen, Director of Sales, Innargi
Podcast Collaboration is Bringing District Heating to Burnaby in Metro Vancouver By Kerstin Sernhed, Lund University
Twin Pipes Offering the Lowest Total cost of Ownership By Sabrina Fröhlich, Head of Marketing & PR, Isoplus Group, Jens Rasmussen, Head of Technical Department, Isoplus DK and Gregor Felgner, Project Manager, Isoplus DE
The Role of Energy Cooperatives in Financing Europe’s Green Transition By Joachim Vanwalleghem
Intelligent Heat Networks: The Cornerstone of Resilient and Sustainable Urban Energy By Ronak Monga

Recommendations for Implementing District Heating HOT|COOL NO.4/2025

Preface: From Vision to Practical Action: Implementing District Heating Today By Lars Hummelmose, Managing Director, DBDH
District Heating: Europe’s Way to Security and Competitiveness By Magnus Skovrind Pedersen and Lasse Skou Lindstad

Seawater Heat Pump: First Operational Experience from a Megaproject in Esbjerg, DK By Claus A. Nielsen, Raymond Decorvet and Tommy Mølbak
Low-temperature District Heating:
How to Reduce the Temperature in Existing District Heating Networks By Pernille M. Overbye
The Role of Energy Cooperatives in Financing Europe’s Green Transition By Joachim Vanwalleghem
Intelligent Heat Networks: The Cornerstone of Resilient and Sustainable Urban Energy By Ronak Monga

Digitalization & Smart Choices in District Heating HOT|COOL NO.3/2025

Preface: Smart Choices Drive Sustainable Heating! By Lars Hummelmose, Managing Director, DBDH
Duration Curves and How They Should Influence the Choice of Heat Production Capacity By Morten Jordt Duedahl, Business Development Manager, DBDH

It’s not just the Grass That’s Greener Next Door – Their Heating might be, too! By Elsebeth Arendt, Head of District Heating, Kredsløb, DK
A Future Perspective on the Digitalizaton of the District Energy Systems By Michele Tunzi, Associate Professor at DTU, and Dietrich Schmidt, Innovation Field Manager, Fraunhofer IEE
Geothermal Energy: Revolutionizing District Heating for a Sustainable Future By Søren Berg Lorenzen, Director of Sales, Innargi
Twin Pipes Offering the Lowest Total cost of Ownership By Sabrina Fröhlich, Head of Marketing & PR, Isoplus Group, Jens Rasmussen, Head of Technical Department, Isoplus DK and Gregor Felgner, Project Manager, Isoplus DE

District Cooling HOT|COOL NO.2/2025

Editorial: Building a Sustainable Future: Why Municipalities Should Establish Their Own Heating Companies By Michiel de Wit, Process Manager District Heating at the Municipality Súdwest-Fryslân and Sacha de Haan, Process Leader heat transition at the
Municipality Súdwest-Fryslân
How to hatch a SWAN: Lessons from the First Six Months Developing the UK’s New Heat Network Zone By Charlotte Owen,
Growth Director, Hemiko

Driving Decarbonisation in Europe: Act!onHeat Charts a Path for Sustainable Heating and Cooling By Lucy Mears, Communications Expert, Strategic Communications, Membership and Advocacy, ICLEI Europe
District Energy in Burnaby, Canada By James Lota, General Manager of Lands and Facilities at the City of Burnaby
Podcast Exploring Aquathermal Energy with WaterWarmth By Lesia Logvynenko, Project Manager, DBDH

Missing Actors in the Heat Market: Business Models, Storage, Waste Heat HOT|COOL Special Collection edition no. 2/2024

Preface: Do you remember this card game? By Morten Jordt Duedahl, Business Developer, DBDH and Hanne Kortegaard Støchkel, Project Development Manager, DBDH
Large Thermal Energy Storage (LTES) will Help Shape the Future Energy Landscape By Geoffroy Gauthier,
Energy and Calculation Engineer – Project Manager, PlanEnergi

The Missing Actor in the Heat Market: How to fill the Gap in Germany By Susanne Schmelcher, Director of Department for Districts & Cities, German energy agency DENA
Low-Temperature District Heating for Old and New Buildings By Niels Hansen, Senior Consultant, Albertslund Municipality
The Challenge of District Cooling: Turning Vision into Reality By Jakob Bjerregaard, Partner and Lea Riber Junge, Junior Consultant, DEVCCO
Electrification of Space Heating – District Heating is Often the Intelligent Solution By Lars Gullev, Senior Consultant, VEKS, Hanne Kortegaard Støchkel, Researcher and Project Development Manager, DBDH, Jesper Koch, Head of Analysis, Grøn Energi
Clarification of the term “District Heating Generations” By Dr. Robin Wiltshire, Chair, IEA DHC programme, Dr. Andrej Jentsch, IEA DHC Programme Manager, and Senior consultant Lars Gullev, Vice-chair, IEA DHC programme
Energy Storage and Smart Energy Systems By Toke Kjær Christensen, Ph.D., Department of Sustainability and Planning, Aalborg University
Waste Heat – the Overlooked Resource Waiting to be Harnessed By Oddgeir Gudmundsson and Jan Eric Thorsen,
Directors, Climate Solutions, Danfoss A/S
District Cooling Implementation in Indonesia: A Gateway to Collaboration By Rana Yusuf Nasir and Rahman Wirajaya, AP Buildings
How Does the End-User’s Behavior Influence the Operating Temperatures in District Heating Networks? By Michele Tunzi, Associate Professor, DTU Construct
Tom Diget, Chief Operating Officer, Viborg DHC, Kees van der Veer, Vice President, IT and Software, Brunata, Anders Nielsen,
Application Manager, Grundfos