The shower in my master bath is freezing the heat escapes through the top since the ceilings are so high. Shower was ripped out (just tile walls and contractor wants me to pick out tile for new shower and he will put a cap on it. Is this my best option?? Also former shower had no door and I put up a shower curtain should i have him put in a glass door for me? He seemed to think no? Is this because of cost?