I did dual heat my first time too even though night time temps were 40-50F. I'm just a baby steps kind of person so it helped ME to not worry, whereas THEY were just fine with the Mommy Hut. I still use the same heating pad over wire frame that I started using 10years ago. It's so warm under there and they still dart out and goof around no matter what the temp is, then back under for sleep. I never hear distress cheeps, never have pasty butt, I've never lost a chick. For OP, these links below along with my own threads seeking advice and getting it from so many people especially 3KillerB's and Blooie, is how I made the transition. Hope you do too!!
https://www.backyardchickens.com/ar...and-start-raising-your-chicks-outdoors.71995/
http://www.backyardchickens.com/a/yes-you-certainly-can-brood-chicks-outdoors
http://www.backyardchickens.com/t/956958/mama-heating-pad-in-the-brooder-picture-heavy-update
https://www.backyardchickens.com/ar...and-start-raising-your-chicks-outdoors.71995/
http://www.backyardchickens.com/a/yes-you-certainly-can-brood-chicks-outdoors
http://www.backyardchickens.com/t/956958/mama-heating-pad-in-the-brooder-picture-heavy-update