Not like this home casting lark where you can't do it for half the year as it is too cold then the rest of the year it is too hot 
I have seen some on the UK who have their furnace what looks like a precast shed on the back of the house, with a steel pipe up to above the roof.
The furnace exhaust opening is in the upper back of the furnace, out the back wall.
The lid has an opening, but a lid is placed over it unless access is required for skimming or charging.
I know someone in Canada who runs his furnace in a shed, and does this with iron work.
Risky business in my opinion, since there are stories posted of folks doing this who get into either a low-oxygen situation, or a carbon monoxide situation, or both, and end up face planted outside in the snow for a few hours, with a hospital trip afterwards, and doctors saying nobody they had ever seen survived this low a level of blood oxygen.
And the fellow with the large reverb iron furnace in MS runs his furnace inside his shed, with the large door open.
He has a large fan blowing into the shop, but said he needs more fans because he is not getting enough fresh air in the shop.
I have considered a rolling doghouse affair to put over my furnace, that can be raised and lowered.
I tried an elevated canopy over my furnace, and even with perhaps 8 feet separation, the canopy melted.
And then the wind took out what was left of the canopy, and bent the framing beyond use.
I now have sheet metal, and the plan it to make a curved roof canopy that can be extended up perhaps to 7 feet tall, and then lowered to about 48 inches tall after the melt.
An all metal canopy will be able to withstand the exhaust blast.
I have poured in 32F weather, and that is not a problem with the furnace, burner or fuel (diesel).
The biggest problem in cold weather is keeping the mold heated to about 70 F, and I use an enclosure with a hair dryer for that.
Cold weather is nice because it keeps one cool with full leathers on standing next to a hot furnace.
In the summer, I pour at night, since pouring in the daytime in direct sunlight will cause a heat stroke in about 30 minutes.
For summer pours, I wait until pour time before I put on full leathers, and I use a box fan next to my chair when watching the furnace.
Ideally a small induction furnace work best, but they are not without their problems.
One person who used one said the water coil failed towards the end of an iron melt, and cause an explosion which almost hurt him badly.
And the utility company is not set up to feed much of an induction furnace load.
But yeah, winter and summer pours can be done without too much trouble.
Getting a rain storm in the middle of a melt is more problematic, and I had that happen once, and had sheet metal over the furnace.
I finished the melt and poured into molds that were partially wet; which was not a great idea, but it worked without an exposion.
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