Only the seeds of the habaneros I bought are hot - low quality, or simply the nature of chili?
I've experimented with growing different varieties of peppers over last decade and found by surrounding one with other types of peppers (sweet, medium or hot) and increasing or reducing water near harvest time you can completely change the heat and flavor of the peppers from that plant. If planted in a pot you can move it around your garden to get different tasting peppers from the same plant throughout the season.