All AIRSYS Lead/Lag Controllers (ASLLC) are upgrade-able.  The upgrade process is very simple, but it does require a Smart Key with the software preloaded.  Currently, we provide Smart Keys with the latest version of software to our Premier Service Contractors at no charge.  We will also send out Smart Keys to cell technicians and other non-premier level service contractors upon special request.  If you are interested in upgrading the software of your HVAC system, shoot us an email at or open a New Support Ticket and we can figure out the best way to support you.  

Refer to our ASLLC Software Revision ChangeLog for info on changes made.