Lots of hot sun and feed them some chicken manure. Don't water unless they are wilting once they have a good set of peppers on them. Last year mine were scorchers because it was very hot and dry and they got a good dose of chicken when the soil was being prepared. We usually have hot dry weather late in the summer and peppers are usually much hotter then than earlier in the season when it is usually rainier and somewhat cooler.
One year about 8 or 9 years ago we had a really rainy, relatively cool summer and none of my peppers were hot. My jalapenos might as well have been bells as far as having any heat.
Bill
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