JohnMo

If your a well insulated house, your flow temp isn't going to much higher than about 28 at -lots outside, so zero point going beyond that. We never bothered doing any drying cycling as we didn't have a heat source at the time. Your heat pump is pretty unlikely to fire up, if the floor is already warm. It will or should have a drying programme, so run that and limit max temperature otherwise you'll just melt.

The average, not the worst or best the average. Pretty simple. Look it up, plenty of info out there, but approx 3x worse. in theory, if we generate enough electricity and we don't, and people can afford it. No issue with that, have voted with my own feet and my own money (no grant money taken).Now getting cheaper bill because of it (a lot cheaper). But again we needs lots of electric generation. Scotland way further ahead than the rest of the UK. All I am saying is aviation isn't great. But to keep flying, you may need to open the oil and gas pipe line again - which you are opposed too. You can't have everything.

Generally all heat pump stuff is 28mm and bigger. If your pipe runs are short 22mm is fine, if they are long 28mm may be better. Valve https://www.unventedcomponentseurope.com/inta-1-female-swivel-x-1-male-heat-pump-extended-lever-ball-valve-hpbv11.html/?utm_source=Google Shopping&utm_campaign=Copy Unvented Components Europe&utm_medium=cpc&utm_term=adtribes&gad_source=1&gad_campaignid=17178278874&gbraid=0AAAAADCTOYDIF7_WqM1JdaR45hjcYe7rN&gclid=Cj0KCQjwlqTRBhCBARIsANrkrxiP5YU1oqx-01ITZliqfzcXOrTDlwcJv1dfpMhdWYFUDscVx6Kw2D0aAtV4EALw_wcB

Stud wall in wood should just get a big tick.

But these emissions and others are in a worse place at high altitude, so in effect 3x times as bad as ground based pollutants. So now you have jumped to 2 Tonnes. I read 2.2, so we have different sources. But 4 in the family home is equal to 500kg if your playing the per person game. But for me one transatlantic flight per person is same as heating by gas for a year per person, but high altitude emissions are 3x as bad for the environment.

Did read. So your calculations are still wrong. It still uses almost the same quantity of fuel for 1 person or a few hundred. I've been on business only flights from Singapore to Houston and there were 12 fare paying passengers - so the maths don't make much sense. My car car does 20 mpg, but with 5 people in it, does it all of a sudden do 100mpg. No it still does 20mpg. Strange way to say I like long haul flights and here is my justification. Aircraft use a shit load of fuel, putting the emissions where they do the least good. I have done way more than my fair share of trips around the world, doesn't make good or sensible anymore.

Sorry you are very wrong - you forgot that consumption is per person based on being full of passengers. A 747 holds between 182,000 to 240,000 litres, based on your fuel economy that one hell of a lot miles it could do.

All our internal walls are wooden stud, 3x2 for non structural 4x2 for structural. Lined with plasterboard. 50mm insulation in the 3" and 75mm in 4". Easy to do, all materials readily available. 3x2 with 12.5mm end up 95mm thick. Water resistant plasterboard in wet rooms. Mine are all dry lined, as are most in Scotland, zero issues for me.

Yes we can get fresh fruit from the other side of the world out of season, we can go ongoing haul holiday's - is any of this good for the environment - no. But sounds like you want to keep your holidays and who cares. Sorry me swooping to ASHP may have a good impact on the environment - but it's super small impact. Insignificant compared to even starting a gas turbine let alone dragging 540 Tonnes of A380 into the sky. The aircraft can do about 80 to 90 miles per US gallon per person. Which any diesel car can do with 2 people in it and double that with 4 people in it.

Do find this very much goes against everything you seem to preach. It may have massive benefit for ease of travel, but is this travel really needed or just a nice to have?

I used these to get the snow clearance needed to comply with OEM requirements for snow. https://www.wolseley.co.uk/product/pump-house-1000mm-condensing-unit-mounting-block/?pid=P667987

No not room influence - whole house, one room sensor/thermostat for whole house. Hiaer doesn't have a thermostat built into the controller. It is connected to outside temperature sensor so also allows oat switching the whole heat pump off in heating mode when outside is an average (over 6 hrs) above 10 degs. No need to get excited, still single single zone, WC, no actuators, just an on off permission, mostly because running heat pump at 9 degs OAT on full WC at about 22 degs doesn't work, which is about the temperature it needs at that temperature. So heat pump uses a simple permission to run at 26 degs, runs for a couple of hours and then shuts off for about 18 hrs. The colder it gets the longer the run time. No setbacks just single room temperature 24/7. But really needed for cooling as I run a set flow temp with humidity over ride. So makes sense to flick a single switch that takes thermostat from heat cool and same switch moves ASHP between heat cool also.

That sounds a lot, are you sure? But if correct, you will need an additional expansion vessel. Too much expansion room is better than not enough.

Are you having a battery also, if so you need a strategy of what you are doing, as big is better to a point. You maybe better over clocking the inverter with loads of panels, so you have max output for longer periods during a day, and get battery charging as well as max exports. Lots of ways to do this even with a G98 limitation.

We are in a bungalow and have an internal corridor, we have two small roof lights only and it's surprising how much light the bring in. Other ideas, at the leading edge of the roof windows build up a wall and place the roof in windows higher, so they are at window cil level. Get natural protection. Same window just install higher. Question - Realistically will you ever use that space, when and how. For me and our household we never would. I would really look at the reasons for even doing this, not cheap, not easy, maybe never used space.