ENT recommendations for sleep apnea

My husband got diagnosed with sleep apnea. He did a round of antibiotics to clear his sinus infection but didn’t work. His current doctor suggested balloon sinuplasty and septoplasty to fix his inflamed nostril tissues and deviated septum. I want to get a second opinion from another ENT who specializes in sleep apnea before jumping into surgery. He also tried using the CPAP machine but that didn’t help much either.