I have SAD too, and I live in a place that has very cold winters.
I have a light alarm, it gradually gets brighter in the morning (mimics the sun). This makes a big difference as I have to get up when it's still dark. I found my bio rithm is not so confused anymore.
At work I have a special lamp for health reasons, a colleague has one on her desk too.
Indoors I keep the temperature really high. I have really good gear to go out (hooded coat, boots especially for these extreem temperatures.
I skate and walk everywhere I can.
Best would be a travel brake for a week or two, in a warm climate. That's not in the budget every year, but it helps recharge the battery.
Winter is still hard on the spirits, but these things sure help to get through it.