4

The discrepancy you find is about 30 %, and is probably in the range that you have to expect. The Report on a fair energy label for consumers "CLOSING THE ‘REALITY GAP’ – ENSURING A FAIR ENERGY LABEL FOR CONSUMERS" by CLASP, ECOS, EEB and Topten, 2017 says: Fridge energy consumption is tested and reported according to a norm (EN 62552:2013) that basically ...


3

tl;dr: fans are cheap and already pretty efficient, so an ENERGY STAR certification wouldn't do much to reduce energy usage. ENERGY STAR provides a list of scoping reports with details of products that are not certified, but have been studied for certification. Portable fans are not on the list. However, we can look at the six "guiding principles" for ...


2

To reduce the effect of the 2 cm gap under the door you could attach a door sweep. Any gaps around the air conditioning unit in the window can be sealed with silicone sealant. To reduce electricity consumption, ensure the air conditioner is the correct size/capacity for the room it is supposed to cool. An undersized unit will continuously operate and under ...


2

Here's a few things to try: Increase the temperature setting on the Air con Air conditioning units typically do two things: lower the ambient temperature, and remove humidity from the air. Depending on where you live the humidity can be a bigger factor in getting a good night's sleep than the temperature itself, as it exacerbates sweating and makes the air ...


2

Efficiency numbers are, unfortunately, misused/abused by companies that manufacture and sell wood heaters. "Combustion Efficiency" is not actually a direct measure of how much heat is produced by burning wood. It's a direct measure of "how completely (or cleanly) the wood has burned". A stove that has an 89.1% combustion efficiency burns 89.1% of all the ...


2

That's a great question! The US Environmental Protection Agency (EPA) says the main reason to clean is eliminating mold, critters & other toxins, and since your gunk is dark colored it could well have mold spores so I'd vote yes. (They include lots of advice on finding, hiring & checking contractors' work, too, so it's useful as well as authoritative!...


1

If you shut off the heat to the rest of the house, the rest of the house gets cold. And while this reduces the gas bill, it doesn't reduce it as much as you think. You have cooled off the mass of the house, so it takes some extra gas burning time to make up for this. To put numbers on this you would need to do the following: Record the amount of gas used ...


1

You might be able to use some of the data from https://en.wikipedia.org/wiki/Energy_efficiency_in_transport — which includes figures for typical per-passenger efficiency, but not for freight. There are also over a hundred footnotes, which might get you to better numbers or approaches. Also I'd check to see if the IEA has done anything in this area: they ...


1

What level of light intensity (lumens) do you need across a solar panel in order to obtain an energy-output to incident-light efficiency of 15%? This depends on the varying characteristics of different materials, so in this case I'll pick one Silicon based as they're pretty common, mass produced and cheap, and more to the point they're the only one I could ...


Only top voted, non community-wiki answers of a minimum length are eligible