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You'll have to take a look at historical records to find the best in your local area, or ask around your neighbours.
As had been said before, natural gas is far more volatile in pricing, especially in current markets. It's not as bad in the states, but over here it really dives and turns depending on how much of a bitch russia fancies being on any given day.
The best solution is to insulate the crap out of your house, anything and everything. For his surverying degree thesis my dad did a study on the viability of renewable energy sources (e.g. wind/wave/solar) and found that it is was cheaper, easier and would impart more long energy and cost savings just to insulate houses and other buildings more effectivly.
Last time he did an update (i.e. had to look into it for a building project) the same idea still stood.
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