PS You willl need devise certain 'strategies' for communcating with someone who can't hear well, assuming that are already doing their 'bit' ie that they are WEARING their HAs.
One of my 'rules' is that I REFUSE to shout. (Unless in an emergency!) I have a very weak voice and this would just hurt me if I did it a lot. So I have never gone down the route of shouting.
I think a lot of people end up shouting (eg to deaf, old folks) but I find it quite rude/embarrassing and not very helpful.
Much better to get their attention (somehow) 1st, and then speak face to face. Mostly this means you have to find/get close to them. (Or they they have to find/approach you.) Speaking slowly and clearly to their face means they have more chance to hear you better. I can never attempt to communciate with my DH over a long distance esp if there's wind or any other noise going on.
Another tactic is to start speaking, then pause ... to see if you have the person's full attention ... so you won't have to repeat the WHOLE story over again! (Which is very annoying.) So I wait for eye contact before I continue.
And for TV, you can get special devises (wireless lightweight headsets) for the hard of hearing, which means the rest of you don't have to have the TV on full volume.
As with most disabilities, having the money to buy the best aids is really very useful. (So hope that's not a problem for you.)
FYI, HAs are advancing at a very quick pace and our son (now a young working adult) has got tiny inside-the-ear-canal HAs which are very discreet & very powerful. (Also very expensive!) They are pre-programmed by the audiologst for his hearing loss, then they 'learn' what sounds are most common for his environment and adapt their functions accordingly, (somehow) to 'cope' with the varying levels of sound he is exposed to. (This is to protect the ears from sudden loud noises while allowing for more amplification in quiet situations.)
It seems it DOES take a long time to get used to wearing HAs for adults, and they are obviously v annoying to have in the ears, (as no one would choose to wear them if they didn't have to), but I understand that the more you wear them (as long as they are decent ones which fit), the easier/better it gets. (They 'learn' and the wearer adapts.)
So I really hope your DH will look into making sure he has the best HAs he can afford (or that the NHS can offer) and that he 'makes friends' with wearing them, as he will miss so much if he doesn't. And with age, he will struggle more and more. So the sooner he gets used to them the better?
Even for a modest hearing lose I think they are a great boon.
And more people are openly wearing HAs now ... ie not trying to hide them ... including younger people. (You can even get brightly coloured ones for behind the ear.) So it would be great if you could convince him to wear his ... for him and also for others (including kids) who might have far worse hearing loss than his?
Is there a chance your DS will need HAs one day? If yes, his dad should show him how 'cool' they are and/or show a good example re wearing his now?! 