London's Ecobuild has just concluded for another year and Ben Adam-Smith shares his experience of the event. In this episode he chats to four people he met there - Janet Cotterell from Passivhaus Homes, Jon Bootland from the Passivhaus Trust, Jo Gooding from the UK Cohousing Network and Robert Stern from Litmus Films.

Justin Broadbent from isoenergy explains what a ground source heat pump is and how it could be used as a solution to make a period property energy efficient.

What's more important - preserving heritage architecture or retrofitting it to high energy efficiency? In our first forum on a Google+ Hangout we discuss some of the issues.

The Panel

Writer and blogger Roger Hunt (who appeared in our 10th podcast)

Writer and Passivhaus consultant Adam Dadeby from Passivhaus Homes (who appeared in our 5th podcast)

Homeowner Ross Atkin (who has recently retrofitted his Victorian house)

Ben Adam-Smith shares an idea he has about using the Internet to communicate the need for incremental lifestyle change as an action to combat climate change. This one-off episode focusses on how you could use content marketing to get your message across. Cesar Abeid from The Construction Industry Podcast is Ben's guest and helps explain how content marketing works.

Bill Butcher from Green Building Store shares his approach to creating a low energy barn conversion by building a box within a box. Stirley Community Farm will meet the EnerPHit standard.

Jason and Lucy Reeve share what preparation was necessary to commission their new-build home and Ben Adam-Smith considers what's more important in renovation, preserving the past or creating a sustainable future.

Dr Derek Taylor from Altechnica weighs up the pros and cons of various renewable energy sources and shares his thoughts on whether you should be generating at home. He also talks about his role in creating one of the UK's most energy-efficient homes.