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Jan Rosenow @janrosenow.bsky.social · 05/01/2026

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...

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James Hansen @drjamesehansen.bsky.social · 10/11/2025

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

youtu.be

James Hansen - Climate Reckoning in ATLAS25, Operaatio Arktis, Helsinki, Finland

YouTube video by Climate Science, Awareness and Solutions

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James Hansen @drjamesehansen.bsky.social · 18/12/2025

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....

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Leon Simons @leonsimons.com · 21/12/2025

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:

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Glyn Hudson @glynhudson.bsky.social · 18/12/2025

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 👏 🎉

heatpumpmonitor.org

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.

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Jan Rosenow @janrosenow.bsky.social · 18/12/2025

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...

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Glyn Hudson @glynhudson.bsky.social · 30/03/2025

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

tbartonelectrical.co.uk

T Barton Electrical | Solar, Home Battery and Electrical Installations and Service

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Trystan Lea @trystanlea.bsky.social · 29/03/2025

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

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Keith Alexander @keithalexander.bsky.social · 26/03/2025

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).

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Glyn Hudson @glynhudson.bsky.social · 26/03/2025

Heat pumps are running! Still lots of tweaking and tidying to do but building is heating up 😁

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Glyn Hudson @glynhudson.bsky.social · 26/03/2025

30kW SolarEdge PV and 65kWh of GivEnergy Commercial battey system is now up and running, with @openenergymon.bsky.social monitoring 😀

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Trystan Lea @trystanlea.bsky.social · 10/03/2025

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 🤓

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Glyn Hudson @glynhudson.bsky.social · 27/02/2025

Solar PV install is coming along, only another 43 panels to go! 🥵⚡

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Glyn Hudson @glynhudson.bsky.social · 26/02/2025

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" 😁

heatpumpmonitor.org

HeatpumpMonitor.org

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Glyn Hudson @glynhudson.bsky.social · 14/02/2025

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?...

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Glyn Hudson @glynhudson.bsky.social · 17/02/2025

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 😀

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Glyn Hudson @glynhudson.bsky.social · 19/02/2025

More panels going up! Only 60 more to go 😅

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Glyn Hudson @glynhudson.bsky.social · 17/02/2025

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 😁

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Glyn Hudson @glynhudson.bsky.social · 19/02/2025

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?...

heatpumpmonitor.org

HeatpumpMonitor.org

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Glyn Hudson @glynhudson.bsky.social · 07/02/2025

Big update incoming for OpenVehicles (OVMS) Android app 😍

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Glyn Hudson @glynhudson.bsky.social · 02/02/2025

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

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Cllr Owen Burbidge 🔶 @oburbidge.bsky.social · 27/12/2024

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!

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Nathan Gambling @betatalk.bsky.social · 11/12/2024

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...

heatpumpmonitor.org

HeatpumpMonitor.org

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Glyn Hudson @glynhudson.bsky.social · 11/12/2024

I've been on the tools this week with @trystanlea.bsky.social retrofitting a heat meter and re-wiring to fit a Homley controller to this 3yr old Grant heat pump, COP efficiency should be considerably improved, will report back...

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Nathan Gambling @betatalk.bsky.social · 03/12/2024

BEST PERFORMING HEAT PUMP in UK costs 3.8 pence per kWh to heat an older property (with solid brick walls) just using radiators. If the system was to use the @ovoenergy.bsky.social plus tarrif it would only cost 2.99 pence per kWh You can hear about it on the BetaTalk podcast

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Es Tresidder @estresidder.bsky.social · 23/11/2024

We've got a full year of monitoring for heating & hot water in our #Passivhaus EnerPHit retrofit. Our total electricity usage, for heating and hot water, between 14th November 2023 and 14th November 2024 was just £175!

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coppicejt.bsky.social @coppicejt.bsky.social · 23/11/2024

Yes that'll be needed to match and smooth it out hour by hour @trystanlea.bsky.social has done some more detailed analysis including battery and gas back up here. Probably a 9kWh battery is enough? trystanlea.org.uk/communityene...

trystanlea.org.uk

Trystan Lea

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Tom Brown @nworbmot.bsky.social · 15/11/2024

Article w/ @euronion42.bsky.social looking at using methanol for long duration energy storage is out of the paywall! Liquids = ultimate resilience. Openly accessible from now until forever. doi.org/10.1016/j.jo... More thoughts on methanol below...

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Jeff Colley @jeffcolley.bsky.social · 22/11/2024

Test results are one thing, but how do heat pumps work in reality? Really well in most cases, according to the live heat pump performance data on www.heatpumpmonitor.org, a website from the good folks at @openenergymon.bsky.social.

heatpumpmonitor.org

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Tom Brown @nworbmot.bsky.social · 22/11/2024

Oh hold on, wait. It's open source. We offer **everyone** a free licence for PyPSA. That's the point. Everyone, regardless of background and means, should be able to model the transformation of their energy systems, see what the code is doing, and modify it if need be. github.com/pypsa/pypsa

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Chris Baraniuk @chrisbaraniuk.com · 19/11/2024

Heat pump starter pack just dropped. go.bsky.app/KCLxmj9

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Glyn Hudson @glynhudson.bsky.social · 21/11/2024

This evening I've been doing some max output testing with a Vaillant 5kW ASHP, at 0C with 45C flow Vaillant claim an output of 6.6kW is possible, however in real world taking into account defrosts it only managed to output 5.3kW, which is 80% of the stated output

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Cllr Owen Burbidge 🔶 @oburbidge.bsky.social · 16/11/2024

A friend has used 40kWh of gas today to heat their house to an average temp of 19C which works out about 9.9kg of CO2 in emissions. Electricity in the NE is 7g CO2e/kWh today. Meaning to maintain our house at 21C today has cost 39.2g CO2e. It’s insane how much an #ASHP would reduce CO2 emissions.

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EssaysConcern @richarderskine.bsky.social · 16/11/2024

On long duration storage, I'd give a shout out to the Royal Society report on this topic, that addresses the often played, perceived 'gotcha' card of a dunkelflaute. Oh, but we can deal with that too. royalsociety.org/news-resourc...

royalsociety.org

Large-scale electricity storage | Royal Society

This policy briefing explores the need for energy storage to underpin renewable energy generation in Great Britain. It assesses various energy storage technologies.

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Kate de Selincourt @katedes.bsky.social · 15/11/2024

Woods were looking rather romantic this morning

Gold, orange and russet trees seen through dark trunks in the foreground

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Chris Baraniuk @chrisbaraniuk.com · 15/11/2024

Last month, heat pump installer Damon Blakemore hit a major goal: one of his installations clocked a seasonal coefficient of performance (SCOP) of 5. That means a 12-month average of 5kW heat for every 1kW electricity the device used. The first air source heat pump to do so on heatpumpmonitor.org.

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Mike Shevdon @shevdon.bsky.social · 15/11/2024

If you're thinking that maybe a heat pump is for you, here is real-world data from people's houses, showing actual performance in our climate. It helps when people say, "heat pumps don't work where we are".

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Wonkish @wonkish.bsky.social · 15/11/2024

For context, this means these heat pumps are running at an average of *390% efficiency*, and there’s a load of systems running at even higher efficiencies than that. (this is possible because heat pumps work by concentrating free diluted heat, even freezing temps, from the environment)

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Trystan Lea @trystanlea.bsky.social · 09/11/2024

How well can heat pumps work when designed, installed and commissioned well? This is one of the main questions we are exploring with HeatpumpMonitor.org. There are now 64 systems with a year of data, averaging an SPF H4 of 3.9. Feel free to explore the data for each system on the site 🤓

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Trystan Lea @trystanlea.bsky.social · 25/08/2024

I've recently updated my blog looking at difference between measured and calculated heat loss in our mid-terrace pre2000 solid stone house trystanlea.org.uk/roombyroomhe... (CIBSE defaults 7.5kW, measured ~3.3 kW)

trystanlea.org.uk

Trystan Lea

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Dominic McCann @zapaman.bsky.social · 04/11/2024

The energy efficiency of our house combined with the power of an ASHP, solar PV and home battery storage is doing an amazing job so far this year. With 10months gone we have spent £814 on energy (elec + standing charge) and earned £555 in FiTs. So net cost to us = £259 (all in) so for Jan-Oct.

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Kate de Selincourt @katedes.bsky.social · 15/10/2024

Join me and @alanclarke.bsky.social talking about how to get a heat pump working well in retrofit, why they sometimes don't, and how to avoid adding fuel to Dale Vince's nasty grass-cuttings bonfire passivhaustrust.org.uk/news/detail/...

passivhaustrust.org.uk

Passivhaus News

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Trystan Lea @trystanlea.bsky.social · 09/10/2024

Loved this episode of BetaTalk by @betatalk.bsky.social , good insights that need to be taken on board by much of formal education, not just heat pump courses, but it would be great to see heat pump training lead the way betatalk.buzzsprout.com/509671/episo...

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Dominic McCann @zapaman.bsky.social · 08/10/2024

More interesting data analysis of our ASHP using heatpumpmonitor.org/daily?id=3&m... The transition from combined heating + DHW to just DHW which happens for us ~15C outside temp.

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Dominic McCann @zapaman.bsky.social · 19/09/2024

The ability to view Heat Pump energy use as "all", “run”, “space” and “DHW” on EmonCMS / HeatPumpMonitor.org is really helpful. I am showing the DHW and the Space heat view here to highlight the clear differences that are visible.

DHW view for a whole year (for data that is available - from 02/11/23 onwards)

Space heating view for a whole year (NB this is combined space + DHW values prior to 2/11/23 when I was able to implement the flags which separate the available data).

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