JXP writes -
Circuit board pre-heat workstations are very expensive, $350.00 – $2500.00. The goal of this project is to demonstrate how to make a circuit board pre-heat workstation for around $50.00 with no special tools and the majority of materials from Home Depot and Harbor Freight Tools…
HOW TO – Make a low cost circuit board pre-heat workstation for solder re-work – [via] Link.
An alternative is to use the plastic welding kit from Harbor freight. It jets hot air from a large soldering iron look-alike to small areas. About $40, did buy one and use it for SMD de-soldering. You will also need a source of air at about 3-5 psi.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=41592