Hold on and focus on survival until you hear a loud alert from the Combine Overwatch about having you cornered. Alyx will comment on it, in case you miss it. This should signal an attack on the basement. 2 elites and a shotgunner should blow the doors and move up into the house. You should be able to ambush them on the stairs overlooking the front door. Make sure you grab the alt-fire charges for the pulse rifle. We really need some.

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After these 3 are dead, one hunter should climb in the window over the backdoor. We'll go ahead and just pound this one with shotgun blasts, since it should take a minute to really get into attack mode. You could try and use the radiators to catch the darts, but there just isn't enough room in here. They'll probably just charge you if you try anyway, and that rush attack really hurts.
With the first one dead, the second should charge into the inn. Check your alt-fire charges on the pulse rifle. The secret is that one direct hit from the energy orb will kill a hunter. This is really effective in the tight spaces of the inn. If you have 3, then go ahead and use one. Otherwise, use the shotgun, the normal fire of the pulse rifle, or the magnum to take it out.
The third one should burst through the doors by the fireplace. Nail it with the alt-fire to save some health. Make a final round around the house and then head outside through the opening the hunter created. Shoot any surviving Combine watching the courtyard and then head toward the forcefield. Go into the building right next to it. There's a shield charger and a health charger in here, so go ahead and charge up. The generator isn't in here though. We need to follow the power line up to the source.