Trystan Lea
@trystanlea.bsky.social
Monitoring heat pumps at HeatpumpMonitor.org, open source energy monitoring at OpenEnergyMonitor.org.
Reposted by Trystan Lea
Well-installed heat pumps installed in the UK today achieve on average a 64% higher efficiency than those during the early trials 15 years ago.
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
January 5, 2026 at 4:11 PM
Well-installed heat pumps installed in the UK today achieve on average a 64% higher efficiency than those during the early trials 15 years ago.
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
Reposted by Trystan Lea
I have been notified that the video link to my Helsinki talk does not work for some people. Here's an alternative link for those who prefer a YouTube version: youtu.be/D2abyXGvELI
James Hansen - Climate Reckoning in ATLAS25, Operaatio Arktis, Helsinki, Finland
YouTube video by Climate Science, Awareness and Solutions
youtu.be
November 10, 2025 at 3:18 PM
I have been notified that the video link to my Helsinki talk does not work for some people. Here's an alternative link for those who prefer a YouTube version: youtu.be/D2abyXGvELI
Reposted by Trystan Lea
Let’s see what we can learn from temperature change in the next two years – mailchi.mp/caa/global-t...
Also available on Substack: jimehansen.substack.com/.../global-t....
Also available on Substack: jimehansen.substack.com/.../global-t....
December 18, 2025 at 2:26 PM
Let’s see what we can learn from temperature change in the next two years – mailchi.mp/caa/global-t...
Also available on Substack: jimehansen.substack.com/.../global-t....
Also available on Substack: jimehansen.substack.com/.../global-t....
Reposted by Trystan Lea
Based on the 11-year running mean (and on Earth's Energy Imbalance), the near-term rate of warming could turn out much higher than the linear 2010-2025 extrapolation.
The next El Niño peak will be very informative for the rate of global warming, as @drjamesehansen.bsky.social points out:
The next El Niño peak will be very informative for the rate of global warming, as @drjamesehansen.bsky.social points out:
December 21, 2025 at 2:46 PM
Based on the 11-year running mean (and on Earth's Energy Imbalance), the near-term rate of warming could turn out much higher than the linear 2010-2025 extrapolation.
The next El Niño peak will be very informative for the rate of global warming, as @drjamesehansen.bsky.social points out:
The next El Niño peak will be very informative for the rate of global warming, as @drjamesehansen.bsky.social points out:
Reposted by Trystan Lea
Massive thanks to @trystanlea.bsky.social and @glynhudson.bsky.social for setting up HeatPumpMonitor.org, the excellent installers and to the people willing to share their data! Without you none of this would have been possible.
HeatpumpMonitor.org - Heat Pump Performance Data
An open-source initiative to share and compare heat pump performance data. Join our community of heat pump owners sharing real-world performance data.
HeatPumpMonitor.org
December 19, 2025 at 11:33 AM
Massive thanks to @trystanlea.bsky.social and @glynhudson.bsky.social for setting up HeatPumpMonitor.org, the excellent installers and to the people willing to share their data! Without you none of this would have been possible.
Reposted by Trystan Lea
It's been great to be part of this project with @janrosenow.bsky.social @trystanlea.bsky.social to share the results from HeatpumpMonitor.org @openenergymon.bsky.social in a peer-reviewed paper 🥳
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
December 18, 2025 at 1:54 PM
It's been great to be part of this project with @janrosenow.bsky.social @trystanlea.bsky.social to share the results from HeatpumpMonitor.org @openenergymon.bsky.social in a peer-reviewed paper 🥳
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
Reposted by Trystan Lea
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 18, 2025 at 11:30 AM
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Reposted by Trystan Lea
Big thanks to TBarton Electrical for doing an excellent job installing the solar and battery system, they've been great to work with tbartonelectrical.co.uk
March 30, 2025 at 12:11 AM
Big thanks to TBarton Electrical for doing an excellent job installing the solar and battery system, they've been great to work with tbartonelectrical.co.uk
It's been great to be part of this project. While most of the work is credit to Chris from Griffith's heating, Glyn and I did the heatloss calc and are involved in commissioning, optimisation and monitoring of course
Heat pumps are running! Still lots of tweaking and tidying to do but building is heating up 😁
March 29, 2025 at 10:42 AM
It's been great to be part of this project. While most of the work is credit to Chris from Griffith's heating, Glyn and I did the heatloss calc and are involved in commissioning, optimisation and monitoring of course
Reposted by Trystan Lea
When I was getting our heat pump here, because of the twitter heatpump discourse, I was worried that our model was oversized, but found in practice that it actually performs very well! (It's well within @openenergymon.bsky.social's range of useful oversizing).
March 26, 2025 at 5:10 PM
When I was getting our heat pump here, because of the twitter heatpump discourse, I was worried that our model was oversized, but found in practice that it actually performs very well! (It's well within @openenergymon.bsky.social's range of useful oversizing).
Reposted by Trystan Lea
Heat pumps are running! Still lots of tweaking and tidying to do but building is heating up 😁
March 26, 2025 at 2:05 PM
Heat pumps are running! Still lots of tweaking and tidying to do but building is heating up 😁
Reposted by Trystan Lea
30kW SolarEdge PV and 65kWh of GivEnergy Commercial battey system is now up and running, with @openenergymon.bsky.social monitoring 😀
March 26, 2025 at 7:42 PM
30kW SolarEdge PV and 65kWh of GivEnergy Commercial battey system is now up and running, with @openenergymon.bsky.social monitoring 😀
We've written up the main findings from HeatpumpMonitor.org so far here docs.openenergymonitor.org/heatpumpmoni..., presenting this tomorrow at the DESNZ/IEA heatpump research seminar 🤓
March 10, 2025 at 4:58 PM
We've written up the main findings from HeatpumpMonitor.org so far here docs.openenergymonitor.org/heatpumpmoni..., presenting this tomorrow at the DESNZ/IEA heatpump research seminar 🤓
Reposted by Trystan Lea
Solar PV install is coming along, only another 43 panels to go! 🥵⚡
February 27, 2025 at 8:33 PM
Solar PV install is coming along, only another 43 panels to go! 🥵⚡
Reposted by Trystan Lea
I really enjoyed this episode of the @TransitionShow.mastodon.energy.ap.brid.gy podcast with @richardlowes.bsky.social, thanks for the @openenergymon.bsky.social heatpumpmonitor.org mention, "brings an element of fun into heatpumps" 😁
February 26, 2025 at 6:11 PM
I really enjoyed this episode of the @TransitionShow.mastodon.energy.ap.brid.gy podcast with @richardlowes.bsky.social, thanks for the @openenergymon.bsky.social heatpumpmonitor.org mention, "brings an element of fun into heatpumps" 😁
Reposted by Trystan Lea
Here's a video about an interesting ASHP installation I was involved with in a solid stone cottage, the combination of insulation, air tightness, UFH and MVHR has made for a very efficient low-cost heating system with a SCOP of 5.1 for space heating 😀 📈 youtu.be/YouOLThHSNk?...
February 14, 2025 at 1:17 PM
Here's a video about an interesting ASHP installation I was involved with in a solid stone cottage, the combination of insulation, air tightness, UFH and MVHR has made for a very efficient low-cost heating system with a SCOP of 5.1 for space heating 😀 📈 youtu.be/YouOLThHSNk?...
Reposted by Trystan Lea
This is part of a big electrification and decarbonisation project for the building to remove deoendancy on LPG, reduce running costs and increase energy security; this will involve 2x 16kW Viessmann ASHP cascade, 69kWh of GivEnergy storage, 30kW of PV and @openenergymon.bsky.social monitoring 😀
I've been helping out on a solar PV installation on our @Openenergymon shared office space, it will be a 30kW SolarEdge array! Today we fitted the rails and got the first couple of panels in place 😁
February 17, 2025 at 10:44 PM
This is part of a big electrification and decarbonisation project for the building to remove deoendancy on LPG, reduce running costs and increase energy security; this will involve 2x 16kW Viessmann ASHP cascade, 69kWh of GivEnergy storage, 30kW of PV and @openenergymon.bsky.social monitoring 😀
Reposted by Trystan Lea
More panels going up! Only 60 more to go 😅
February 19, 2025 at 11:08 AM
More panels going up! Only 60 more to go 😅
Reposted by Trystan Lea
I've been helping out on a solar PV installation on our @Openenergymon shared office space, it will be a 30kW SolarEdge array! Today we fitted the rails and got the first couple of panels in place 😁
February 17, 2025 at 10:34 PM
I've been helping out on a solar PV installation on our @Openenergymon shared office space, it will be a 30kW SolarEdge array! Today we fitted the rails and got the first couple of panels in place 😁
Reposted by Trystan Lea
This Skill Builder heatpump now one of the best performing systems in the country thanks to a Heat Geek transformation! Here's the live and historic data monitored independently by @openenergymon.bsky.social 👏 heatpumpmonitor.org/system/view?...
February 19, 2025 at 8:48 PM
This Skill Builder heatpump now one of the best performing systems in the country thanks to a Heat Geek transformation! Here's the live and historic data monitored independently by @openenergymon.bsky.social 👏 heatpumpmonitor.org/system/view?...
Reposted by Trystan Lea
Big update incoming for OpenVehicles (OVMS) Android app 😍
February 7, 2025 at 4:14 PM
Big update incoming for OpenVehicles (OVMS) Android app 😍
Reposted by Trystan Lea
Interesting podcast about the Electrification Of Heat government heat pump trial results with Katrina Young from @energysyscat.bsky.social and @trystanlea.bsky.social from @openenergymon.bsky.social
February 2, 2025 at 5:29 PM
Interesting podcast about the Electrification Of Heat government heat pump trial results with Katrina Young from @energysyscat.bsky.social and @trystanlea.bsky.social from @openenergymon.bsky.social
Reposted by Trystan Lea
Current issues with heatpump installations: good write up by @trystanlea.bsky.social on the @openenergymon.bsky.social forums community.openenergymonitor.org/t/over-sized...
Over-sized heat loss = over estimated design temperatures
I wanted to share some thoughts about where I think we are with heat pump system design in the UK as we start 2025. There is a large performance gap between heat pumps that have been designed, instal...
community.openenergymonitor.org
January 24, 2025 at 8:59 AM
Current issues with heatpump installations: good write up by @trystanlea.bsky.social on the @openenergymon.bsky.social forums community.openenergymonitor.org/t/over-sized...
Reposted by Trystan Lea
It’s 4C outside and the ASHP is nearly hitting a COP of 5 😍😍😍
It’s been running continuously since 1320 yesterday despite there being mist and high humidity!
#HeatPumpsWork!
It’s been running continuously since 1320 yesterday despite there being mist and high humidity!
#HeatPumpsWork!
December 27, 2024 at 6:07 AM
It’s 4C outside and the ASHP is nearly hitting a COP of 5 😍😍😍
It’s been running continuously since 1320 yesterday despite there being mist and high humidity!
#HeatPumpsWork!
It’s been running continuously since 1320 yesterday despite there being mist and high humidity!
#HeatPumpsWork!
Reposted by Trystan Lea
16) the UK arguably has Europe's best example of such initiative with @trystanlea.bsky.social's heatpumpmonitor.org which @adambell.bsky.social's heating engineer uses and @madgabes.bsky.social watches. Finland hasn't a patch on this initiative😉
I discuss it here
open.spotify.com/episode/3RAm...
I discuss it here
open.spotify.com/episode/3RAm...
HeatpumpMonitor.org
heatpumpmonitor.org
December 11, 2024 at 3:53 PM
16) the UK arguably has Europe's best example of such initiative with @trystanlea.bsky.social's heatpumpmonitor.org which @adambell.bsky.social's heating engineer uses and @madgabes.bsky.social watches. Finland hasn't a patch on this initiative😉
I discuss it here
open.spotify.com/episode/3RAm...
I discuss it here
open.spotify.com/episode/3RAm...