I rarely do retail outlets because there are 1000’s of them in any one state but a random google search turned up these 2:

http://energyimprovements.net/

The above is only a facsimile of the site but its headquarters are in Tyler Texas and the 800 telephone number should suffice for contact.

http://www.energyimprovements.com/

The funny thing to me is how they are battling over the domain name energyimprovements when they are very local contractors…some things never change.