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Advice on reading thermal images

Mars · 2022-02-23T14:33:21Z

We have borrowed a thermal imaging camera (FLIR One) for a few days to identify heat leaks from house. Working from inside the house was relatively easy. Rooms were warm, with some cool spots in the corners of windows – nothing major. Easy to spot and fix. We then took some thermal images from outside – the ambient temperature was 9-10C. The house was heated to 21-22C. Am I reading the thermal imaging correctly and that we're not really leaking signifiant heat?

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Mars

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Topic starter 15/03/2022 3:11 pm

Using the thermal imaging camera was really helpful. We've found a few areas that require some minor work. Generally, we've been very pleased with the insulation work we've done. The colours aren't always that important – it depends on what you're targeting on.

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heat-pump-newbie

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04/04/2022 11:39 am

@editor Which Flir model was it you used ? I've been thinking about getting the 'cheap' one Flir One Gen 3 with resolution of 60 x 80.

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Mars

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Topic starter 04/04/2022 11:48 am

@heat-pump-newbie, we used this model (FLIR ONE iOS) and it was excellent – a tad pricy, but very, very helpful:

https://amzn.to/4gkv08Q

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robl

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05/04/2022 5:50 pm

@editor

I use my companies Flir camera - I think it's E40, or something like that. It was pricey (£5k), but that was ages ago, they're all much cheaper now. It's best when it's dark and cloudy and cold - the sun heats objects up, and the night sky is very cold so things unevenly cool down if they can "see" it. When it's cold you get better contrast. I think the more expensive cameras have manual focus, bigger aperture, so lower noise, the work one is 50fps - not needed for my "non work activities"!

I tend to let the camera autorange first, then "lock it off", fixing the Tmin and Tmax of the display, so as I walk around the colours don't change their meaning. I like the colour bar on the side for easy reference later.

Here's a pic I took of a friends house recently. I've labelled the walls a(left gable), b(above campervan), c(right hand side):

a) cavity wall insulated

b) rendered cavity wall. Don't think they filled the cavity, hence glowing.

c) wooden slats over cavity wall. Don't think they filled cavity. It looks like it is ok - but cold air will be circulating behind the cladding, so the pic "lies".

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heat-pump-newbie

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05/04/2022 7:23 pm

@robl I have an Fluke IR thermometer which is great unless the scanned surface is shiny, like a copper pipe... Would the Flir have trouble giving a meaningful thermal picture of shiny pipes etc, eg foil covered lagging ? I'm hoping to get a good idea of how well the lagging is performing.

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robl

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05/04/2022 8:03 pm

@heat-pump-newbie

Yes, just as you say it’s terrible with metal surfaces. You can sometimes program in the emissivity, I think ‘mine’ defaults to 0.95. An emissivity 0.95 means 95% of the reading will be of the surface, and 5% is a reflection. Reprogramming the units 0.95 value just changes how the camera interprets the amount of 10um radiation hitting it, it won’t alter the picture itself. If it’s a shiny surface, like a window, you’ll still see images in the reflections, and you won’t see through it or walls, not like in the movies!. I think clean metal is so low emissivity as to be pointless - stick anything on it and it will be ok - pvc tape, paper, paint, dirt.

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Mars

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Topic starter 19/12/2024 8:56 pm

To update the thermal imaging thread, we were recently sent the world’s smallest thermal imaging camera. I’ve just finished reviewing the Thermal Master P2 Pro, and with Picture-in-Picture mode, multi-point monitoring and sharp thermal imaging, it’s pretty awesome. Plus, no extra batteries to charge - it’s powered directly by your phone!

🎥 Watch the full review to see how it compares to the FLIR One and why it’s a must-have for your home:

If you want to buy it, use code RHHP2Pro for a Christmas discount: https://bit.ly/rhh-p2

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colinc

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01/12/2025 8:43 pm

@editor Hi Mars, this thread has been dormant for a while, so thought I'd give it a nudge.

I am in the market looking for a Thermal Imaging device to attach to Andriod (Samsung S25), and wondering if anyone has done/ is doing any research on current models on the market ?

I see that Thermal Master P2 Pro model is currently upgraded to Thermal Master P3; albeit it costs approx 1/3 more, it has a longer lens focal length and manual focus. That said, not sure how much added benefit these new features offer when monitor a heating system ?

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Mars

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Topic starter 01/12/2025 9:05 pm

@colinc, I'd forgotten that this thread even existed so thank you for waking it up 😀

I love the P3. It's a really awesome thermal imaging camera, but if I'm brutally honest it does pretty much the same job as the P2 when it comes to basic home thermal imaging (rads, UFH, air leaks, etc.). I just finished reviewing it a couple of weeks ago: