Replying to Tee vs. combo

alright well me and my friends are first timers this year...we got a tee gun ready to go tomorrow and figure we'll run it from about 3pm till 6 or 7 how much snow will that drop for us? i know not alot maybe a inch or two in the selected spot? would it accumalate better if its closer to the ground i mean we have it maybe 20 ft up and tomorrows high is 24 degrees....so then now a combo gun...how much is the regular pricing range...and how much more snow will it make than a tee gun? thanks for the info