You'll get a kick out of this... when I first moved back to the east coast, I just had to have some smoked salmon for the holidays. The problem was, there was snow piled up everywhere and the temperature was near or below freezing during the day. I bought a whole farmed salmon and built a miniature ventilated greenhouse using heavy mil clear plastic sheeting and strapping boards to encase my smoker in. I opened the garage door on a cold but sunny day and it worked famously! The smoking time was about 7 hours and the end product was delicious.
As usual, my family and the neighbors thought I was nuts. No one complained about eating it though