How should I heat our workshop?

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The workshop just warmed up to 15c after hours of using three electric heaters together.

There has to be a better way!

I am dreading our electricity bill.

From watching videos on the YouTubes, it seems the cheapest option long term is a diesel heater, but even the american guy recommending them didn't think they were legal any longer.

They still sell them on eBay coming from overseas, and take around a month to arrive. Larger units are around £100 but after installation they only cost around $0.20/hour to run, depending on how you have the settings and price of diesel.

I do worry about carbon monoxide, and the fact this is a rented unit, though. These are also the reasons I haven't set up a stove or other burner

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Is it worth attempting to insulate the walls? I doubt I can find any way to get as high as the roof.

I wonder if the heat would just escape up into the rafters anyway?

Some sort of false ceiling over our work area? That would at least trap the warm air better, but would that require some kind of building permission?

Argh, I just don't want to feeze or suffocate!

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Infrared Heaters generate radiant heat. They are suppsed to heat the objects in the room and not the air. They are often used in poorly insulated locations.

!WINE

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Keeping a place like that warm is never easy. Many years ago I helped my dad install a big gas heater in his unit. That was for the warehouse and they had enclosed offices to work in. Can you enclose an area so you're not heating the roof area?

Maybe get a load of crypto mining rigs as those could make you money whilst providing heat.

!BEER

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Without an insulated space you want to do temperature control on, whatever heating you put in will be wasteful and ineffective.

Especially with extremes of temperatures. If it's 15C inside, what is the temperature outside?

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