Too cold for crested

[cresteddragon]

I currently have a 120cmLx120cmHx60cmW tank for my crested and currently using 250w basking light and 250w ceramic light at night for heat. But as it is very cold this past week , his basking spot isn’t getting over 35 and average temp is around 27. He is only 7 months old. Any suggestions to help increase the heat? I’m worried he is going to get too cold, he stays on his basking spot all the time now and is losing appetite. He normally likes his basking spot to be a lot hotter. His tank is also all wooden as well.

 

[Licespray]

Can you raise the basking spot closer to the heat source?