List of hvac and building services engineering companies in nigeria

I have opened this thread so that i can get the names of HVAC and BSE companies here in Nigeria. Please kindly post the names and contact addresses of any such companies known to you as such gesture will be greatly appreciated. I am looking forward to building a career as a Heating, Ventilating, Air conditioning, refrigerating and plumbing engineer. This forum have proven to be wonderful in answering questions on career issues and i seek to harness this benefit. Thanks a lot as you help.