1) Putting them in their rooms for an hour for disrespect is too much time.
2) Your husband undermining your discipline, right or wrong, is scaring the daylights out of your children and making them act out more.
3) The way you and your husband work at cross-purposes with each other like this, with him undermining and seeming like the "good guy" and you coming off as "the bad guy" is a terribly damaging thing to do to children. You can't stop disciplining them or it will scare them and do horrible damage.
4) If your husband won't go to family counseling, go alone. Or, rather, take the 9, 7 and 5 year olds, too.
5) If the dynamic continues, then at first they might see your husband as the good guy, but eventually they will see him for what he is and they will appreciate you.