The air should be blown at him directly, this can be accomplished by a fan better rather than an air conditioner since air from the conditioner will be very cold and the water will not evaporate and your husband will feel cold and be non compliant with the sponging. The air is required to evaporate the water, the sooner the water evaporates, the better the body will cool down. So, a fan will be a better option. You can use a piece of card or something stiff to blow the air at him. Please do leave a positive rating for the service. Best wishes.