Our situation is the same, except turned around. I am the hot one, Pat is the cold one. I bought a dual control electric blanket for our bed, so that helps at night. My side is never turned on and the blanket is usually thrown off of me, but his is up around 8. He knows I cannot sleep if I am too hot, and if I cannot sleep I toss and turn and it disturbs his sleep. But I know that the actual in bed is not the problem at your house.
I keep our thermostat to about 64 to 66 at night. I know it must be hard on Pat when he gets up in the morning, but he doesn't complain. I guess I am the one getting my way in this. I do sometimes turn the thermostat up for him during the day if he is cold, but he's good to try to put on more clothes to get warm and drink some hot tea or coffee to warm up. I have to say, Pat is very patient and gracious about this situation.