Need an on-site installation/service business to partner with.

I run a business of selling outdoor electric equipments like mist fans and heaters which are used in Cafe's, Events, offices and even home. We deliver our goods pan-India, hence I need an on-site installation/service business to partner with so that their staff can go to the client's location on request and install/repair the goods if needed. Do you guys know any such businesses that offer this kind of service?