This room is much colder than the other rooms in my house, so I try to sit still as much as I can.
My bedroom is much cooler than my living room, so I try not to move around too much in there.
ーThis room is much colder than the other rooms in my house, so I try to sit still as much as I can.
「この部屋は家の他の部屋よりずっと寒いので、できるだけじっとしています。」
much colder で「ずっと寒い」
sit still で「じっと座っている・じっとしている」
as much as I can で「できる限り」
ーMy bedroom is much cooler than my living room, so I try not to move around too much in there.
「私の寝室はリビングよりかなり冷えるので、そこではあまり動き回らないようにしている。」
much cooler で「ずっと冷える」
move around で「動き回る」
ご参考まで！
カナダ 
