I do a lot of work for the musical producers. My all day spends in a single room and the room is too much cool. I do not use any heater except electrical. Recently I have gone through an idea about roof insulation and did a little search on this topic and found general FAQ about home insulation but still I am confused to choose a long last and reliable type of insulation which will keep my room warm and will act as barrier between room and cold. Any suggestions?