SteamyTea

That is about 7W per square metre for the electricity. So somewhere around 15 to 20 W per square metre thermally. Just a bit higher than mine, and I am probably 5 deg warmer.

Mine is 99.9%, but there is a proper storm on. At 27% RH, you should not have a frosting problem, and the CoP should be reasonable. Can you check that the supplementary heater is not coming on, that would make it use a lot more juice. The other thing is that it is probably running constantly.

I wondered what Angus Deayton was up to these days, planning officer would suit him. (we does a radio comedy called Alone)

Is that external or internal RH 27% is very low

Possibly as the air may well have a high RH. This may be causing some frosting up of the unit. There is usually an 'odd' temperature where the CoP drops, this is often just above 0°C. Below that, the amount of water that is actually in the air is lower (it has frozen out already). This is why ASHP are oversized, they basically have a larger radiator that takes longer to frost up.

Forgot that bit. Do whatever is easiest.

If you use mineral wool, and external air can pass though it, or parts of it, then you are loosing its ability to insulate. As @Ed Daviessays, you end up with a plasterboard (or other material) tent. I think, but without seeing detail, there may be a condensation risk.

I was thinking about ground floor insulation as I was driving home earlier. First thing that pops into my head is, how would you deal with airtightness?

Who said I would not be naked. Charge extra to put my clothes on.

Time travel maybe.

What Corian, and similar, are. For a few thousand I could cast you a phenolic one. That would be sturdy, long lasting and fire resistant. It would drop sulphuric acid for a few weeks, but that will eventually stop. Not saying it would be beautiful mind.

If I go out when it is cold, my face can glow red, same happens when it is hot. So I am a good, multi temperature emitter. For a few hundred quid I will come and stand in the corner of a room and warm the place up. For a few hundred more I can pretend to be a voice activated infotainment centre. Got to be a better bargain than @pocster walk in glazing.

What was the question.

Depends how you class it I think. If it is just pure liquid water, then no. But water with other elements, like carbon then probably higher. But then, do we count the bacteria that is inside the body, but is not human. My sister is 80% scotch, but was born in Wales.

Yes, but tuned to jiggle water molecules. All heating is just moving atoms.

Not quite. Expansion has often come up as a negative for GRP roofs. Not known it to be a problem, but then, there are big roofs and very big roofs. I think the main problem with GRP is that people think it is easy to do, and can be done by anyone. Because of that, we ended up with the Reliant Robbin (I used to employ some ex Reliant workers, they were useless). It is like plastering, anyone can learn to do it in a day, then you just get better over the years.

Another way to look at it is, if it was so great, we would all be using it.

Here is part of an email I received a while back. Good morning FAR INFRA-RED HERRING I have decided that the phrase "far infrared" (FIR) will henceforth count as a trigger word for bogus energy-saving claims. First used in 1923, FIR is radiation with wavelengths between 10 and 1,000 microns, which (digging in physics books) corresponds to temperatures in the range 3 TO 290 degrees absolute. That's minus 270 to plus 17 Celsius. So when regular reader Will S. drew my attention to an electric radiant heater that claimed to use FIR I was intrigued, and looking more widely on the web I found the term used in relation to saunas and therapeutic clothing, suggesting that it is one of these legitimate scientific terms that has been co-opted for the promotion of snake-oil products. I have nothing against radiant heating in principle. Quite the contrary: for selective heating of spaces that are sparsely or intermittently occupied, or subject to high air throughput, it is likely to be more economical than warm air heating. But the case study that Will sent me was amusing. It concerned a hair salon whose gas-fired central heating system had been replaced with radiant panels. Fair enough, except that some of the panels took the form of heated mirrors. I don't know what the emissivity of a mirror is, but I'll wager it's closer to zero than one. The vendor may care to reflect on that."

I work in kitchens a lot, people spend way too much time and money on them. Stainless steel is the professionals' material of choice.

Musk is a South African, so he should know a bit about economic isolation, eventhough he is a bit young to have experienced the worse of it firsthand.

Portland cement is named after Portland stone, because it looks similar. I had a Portland stone house in Weymouth. Was well stained and grubby. Still is by the looks of it.

Mix some soul in, along with your favourite breakfast cereal seeds, maybe some herbs, a chilli plant. Then place in the garden and forget all about it.

Get @Onoffto have a go, then after a decade we can revisit the topic.

Make a small sample, or 3, and do some tests.

The Japanese inverter ASHP are good, as are the Carrier ones. Carrier are often rebranded in the UK.