Hearing aids aren't some kind of "Magic bullet" however well they've been adjusted and whatever the quality.
They ALL amplify background noise. Even the most expensive private ones aren't yet developed enough to fully distinguish between voice and other sounds - they're getting better all the time, but 100% correctness is the holy grail and they're not there yet!
Assuming NHS, he may need to go back 2 or 3 times to get them adjusted/tweaked to be more comfortable in terms of volume, sensitivity, etc. Some NHS audiologists aren't particularly competent I found. But some are excellent. Go back 2 or 3 times and chances are you'll get a good one (assuming you don't see the same one each time - try choosing a different day or different hospital!).
Obviously, the more sensitive, the more background noise they'll pick up.
You also have to make an effort - they're not a magic bullet. If you talk to him when there's background noise, i.e. an extractor fan, washing machine, television, etc., that will take precedence over your speech, so you have to speak loudly, clearly and directly to him, and not mumble looking away and expecting him to hear - he won't unless the room is otherwise silent.
I've been wearing hearing aids for 15 years. A mix of private and NHS, and the NHS are a mix of local hospital audiology or Specsavers. Private are infinitely better in terms of quality of the aids and the hearing test/fitting/adjustments, but still aren't perfect. NHS hospital were the worst as it took a lot of appointments in different places which wasted a lot of time. Specsavers for NHS was pretty good - one appointment for everything, adjustment set properly, but the quality of the aids was still low quality NHS, but overall experience far better than the hospital.
The OP's husband needs to try more and try to get used to them, but the OP also needs to make more effort to speak clearly and directly, and be more aware of background noises in the house.