I have been running an open cab dozer for 43 years. Started on a 96J D5. Then D6Ds. Purchased my current D6H ll in 1994. It is still doing the job. At this stage of the game an open cab is working fine for me. Less maintenance, easier to work on, slightly better visibility, don't have to worry about glass when clearing land. Really does not bother me. I do mostly soil conservation, rural type work. When it is too cold it is usually too wet to do much work anyway. Heat, no problem. Now for the bottom line. I will probably take it to the house is 3-4 more years. Figured I could save some money by not purchasing a cab and air machine. I would be counting on some folks like you who would not even consider a dozer without cab and air. Most operators this day will not operate a machine without cab and air. If a good machine without cab and air were in existence I would figure it would sell for a reduced price. Does that make sense? Now if I were about 20 years younger, like you probably are, I would go to Cat and purchase me a low hour D6T XL with cab and air that someone who thought they could get rich quick buying a brand new one had let go back to the dealer. One with less than 1200 hours. Don't get me wrong. I work with my son now and most of our other equipment has cab and air. It is nice. I primarily operate the D6H ll and 130G. Neither which has cab and air. Have two fans in the 130G. Works good for me. Maybe I am hardcore, but with only a few years left, I am still loving it.