It’s a minefield… planet shuddering from crisis to crisis, politicians fumbling for solutions or denying there’s a problem. What are we supposed to do?

The solution isn’t hugely difficult. If we all reduced our carbon emissions by 50%, the problem would be dealt with, but how? And what exactly should we be doing?

We’ve brought together the collected scientific and practical knowledge of our team, together with the timely wisdom of our subscriber base, and come up with a few practical rules and indicators

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1. Heating your Home: Heat-Pumps

If you haven’t made the transition yet, the chances are your home is heated with gas central-heating, or even worse oil, coal or wood (yes really)

Make sure your home has a condensing boiler while you make your plans, but you will need to move on, preferably using a heat-pump. Contrary to popular belief, these clever little machines don’t need to be crazily expensive to fit, and they can be very, very cheap to run. Without getting too technical, heat-pumps do exactly what it says on the tin – they move heat from one place to another. They do this without using any energy… except the power needed to drive the mechanism and it’s attached electronic whatnots.
Where can  you find enough heat? If you are heating a large National Trust property a school or your own 8-bed mansion, you really need to draw your heat from underground, or more rarely, the rsea or a convenient river or lake and this is where it can get expensive. These are Ground-Souce Heat-Pumps, and the rest of us don’t need to worry about them.
Most heat-pump systems are described as Air-Source Heat-Pumps, in other words, they draw heat from the atmosphere and bring it into your house, which is straightforward and much cheaper than digging big holes in the garden, but there’s less heat available in the air (in winter at least), so they may struggle in really cold climates.
Air-Source systems are often fitted by plumbers for who it’s a useful sideline, but this inevitably means they will push a system that puts heat into water, often reusing parts of your existing central heating. This air-water-air heating is a problem. Heat-pumps can generate as much heat as you need, but they perform best when producing ‘low-grade’ heat, ie more of a luekwarm sort of heat than a roasting, burn your bum sort of heat when you lean on a radiator. So feeding this low-grade heat into the old radiators can be very disappointing, because they will only ever be lukewarm. Special heat-pumps can produce much hotter water, but they are less efficient, so they will use more electricity, making the whole exercise pointless.
Much better if you are starting with a new build, or have a huge reservoir of cash to play with is an air-floor-air or ground-floor-air, or even lake-floor-air system, which chucks out all the plumbing and puts the heating coils straight under the floor. This suits the heat-pump really well, gives a lovely gentle heat, without the need for radiators, but fitting it from scratch is expensive.
Cheapest of all by far is air-air. This brings the heat indoors to a little heat-exchanger unit, usually mounted high up on one wall in each room. The big disadvantage is an internal fan, which can be almost undetectable on a low setting, but fairly noisy on a high one. On the plus side, it is cheap to buy, fast to fit (typically half to a full day), there’s no tedious paperwork because the government doesn’t get involved. This is because air-air is deemed not to serve a grant because it can also be used as a dehumidifier, and as an air cooler during the summer.
Small systems use a single external heat-pump to provide enough heat for one heat-exchanger in one room. Larger networks may use a more powerful heat-pump to supply heat-exchangers on several rooms. A full house supply will typically supply warm air through ducts to all the rooms. This eliminates the seperate heat-exchangers and can be almost silent in operation, but it’s getting quite expensive

SUMMING UP: If you have piles of cash, ground-source allied to underfloor heating is effective, reliable and efficient. If you don’t have piles of cash, go for air-air. You can get it up and running very quickly for a few thousand pounds, perhaps initially heating two or three downstairs rooms this way. You may decide to fit a bigger, more sophisticated system later on, in which case the air-air components can be removed and sold just as quickly as they went in.
We used a double room system, serving the sitting room and front room/office in our chalet bungalow. Because we have a semi-open layout, the sitting room unit also provides warm air to the kitchen through the door and serving hatch. Heat from both units percolates upstairs

2. Heating Your Home – Solar Wall

This is so easy, so cheap and so bleedin’ obvious, it’s frustrating that so few people do it. Not all homes are orientated the right way. You need a south-facing wall. Build a conservatory! Spend a bit more on really good glazing, preferably triple-glazing, and fit insulation panels in the south-facing roof glass, and easily adjusted solar blinds to the vertical south-facing glass.
Very useful but flawed: it’s an extra room with a view, but a bit cold in winter (don’t try heating it), and a bit hot in the summer, although you can usually open it up the outside. The magic ingredient is an 8-inch thermostatically-controlled fan, set high up in the conservatory, linked to the house via a pipe through the cavity wall. A useful tip – we used a 6-inch fan, but 8-inch would have been quieter and more powerful.
When the conservatory temperature falls below 22C, the fan is off, and the pipe kept closed by automatic vanes. When the temperature rises above 22C, the fan starts, the vanes open and the conservatory produces heat. In the summer, the whole system is turned off, but in autumn and spring it comes into its own, often producing enough heat during the day to keep the heat-pump off in the evening. During the winter, output is much lower, and the fan runs for a much shorter time, even when it’s sunny, but this is free energy! The fan consumes very little power and it’s usually only on when the PV panes are producing electricity.
You can perform a similar trick by opening and closing the house/consvatory doors manually, but this won’t work when you’re out, or busy, and you have to remember to close the doors on an autumn evening, when the cooling conservatory will start to draw heat back out of the house very rapidly.
If you can’t afford a conservatory, don’t have space, or just don’t want a sun-room, a solar wall will do much the same thing. There are different types, but in principle you mount a glazed box on the outside wall and use a fan or convection to draw heat into the house. It’s not a common arrangement, because quite a large area of glazing is needed to have a worthwile effect, and this can work out quite expensive, without the bonus of a conservatory to offset the cost