I'm thinking of purposely keeping my bedroom cold so my dog will cuddle with me!
Why do you want to cuddle with your dog?
I like to hug my dog when it's cold.
It is normal to want to be affectionate with your pets but it is not good to make them feel cold just to cuddle with them. As a pet owner you have to be responsible and make sure that they are taken care of.
But I really love my dog, even if it is cold we can save on heat.
That is still not an acceptable reason to make your dog uncomfortable in its home, since the dog won't be able to understand your motives.  You can still spend time with your pet and do bonding activities like walking or playing games. Your dog will love you for it, and may choose to cuddle with you on its own.