We're in Arizona, so our winters aren't very harsh, but we're considering an outdoor venue in Tucson for a January 4th wedding. They said they do a lot of winter weddings and they have plenty of tabletop and free standing heaters. We're expecting maybe about 140-150 people. Has anyone had experience with using heaters at their wedding? Will it provide enough heat for everyone all night? The average low in Tucson in January is about 40 degrees. I'm from the Phoenix area, so that's cold to me... and my dress is sleeveless.