Find out why the insurance company is offering you less than what you think the vehicle is worth.
If your husband wasn’t injured, they don’t owe for lost work, even if your husband uses a car for his job, because your husband could have rented a replacement vehicle until he was able to purchase a new car. However, the other insurance company does owe for about 14-20 days loss of use (common amount for total losses) even if your husband didn’t rent another vehicle.
One thing that is confusing to me is why the insurance company is dealing with your husband if the totaled car is “business owned.”