Garage attic grow help wit cold

I had to bring my plants in woulda got busted n it gettin cold so I put em in my garage attic it was 43 in there when I turned em on at 7 got the lights on at night so that should help them out got smoke blankets up nuts gonna to be gettin cold soon in the buds are pretty small is the cold stunting the growth they been in side for like 6 weeks now been on 12/12 since then n buds started forming b4 I brought em in haven't used much nutes or anything any advice would help thanks also I got 2 that haven't started budding yet almost thou