"Cannot tolerate" because of comfort? If that (or leaking) is the issue, I suggest he play around with the harness settings. It took me awhile to get mine to where the fit was comfortable, with little leaking around the edges. I also find I sleep better and have less leakage if I wear a chinstrap (the mask does not need to be so tight then).
The broad, white chinstrap that fits around my jaw has been much more effective than the sexier tailored ones that fit just under the tip of your chin. It's also the least expensive. Chinstraps, though, can cause contact dermatitis. This has been a strong (earlier) to mild (now, white chinstrap) issue for me, but I have an ointment from my wife's doctor that seems to take care of that, though I now don't always need it.
Tell your husband not to give up. I'm sleeping 7 to 9 hour a night now, instead of the 4 hours I was experiencing before my CPAP. Life is much more pleasant.