Atlantic lows and sudden thaws test any entrance, yet a PVC door can breeze through if you treat it like a boat hatch. Start with the seals: run a finger around the rubber gasket to feel for nicks or flattened corners; a tiny split today becomes a draughty torrent tomorrow. Next, clear the drainage slots hidden in the threshold— a paperclip pushed through the channels lets meltwater escape instead of pooling and icing the track. Check that the door keeps gentle contact with the frame; seasonal contraction can tilt the panel, so loosen the hinge screws, realign and retighten. If salty spray is common, rinse the outer skin with fresh water every few weeks; salt crystals look harmless but they grind paint and embrittle plastic over time. Finally, give the locking points a puff of graphite powder so they snap home even when the metal tries to shrink on the coldest night. Your PVC door will stand quiet guard while the storms howl.