You should send along a sheet of questions that are important to you... (like you read on this board saying all the time everyone is different) =) But, Id make sure to ask 1. type of warmer, wattage, hotplate or bulb, tealight. 2. Give them a rate chart, and have them scale the throw, the lenghtivity, 3. what size room? any ceiling fans, fans, central air ect. and other questions that are important to you. =) Im sure others will chime in on here and give you some other wonderful suggestions... =)