The HTI+ certification is a test of skills in home technologies, created and managed by CompTIA, the Computer Industry Trade Association. To earn the HTI+ certification, the candidate must pass two computer-based tests of skills:

Exam one: Residential Systems
Domain                                                          % of Exam
1.0 Computer Networking Fundamentals                    25%
2.0 Audio/Video Fundamentals                                 20%
3.0 Home Security and Surveillance Systems              10%
4.0 Telecommunications Standards                           10%
5.0 Home Lighting Control                                       10%
6.0 HVAC Management                                           10%
7.0 Water System Controls                                      10%
8.0 Home Access Controls                                       3%
9.0 Misc. Automated Home Features                         2%
Total                                                                  100%

Exam two: Systems Infrastructure
Domain                                                              % of Exam
1.0 Structured Wiring
1A. Low voltage (e.g., twisted pair, coax, shielded, fiber)  25%
1B. High voltage (nominal 120/140 volt)                          25%
2.0 Systems Integration: User int. & control processors    50%
Total                                                                       100%

Source: www.comptia.org/certification/HTI/ 

There is no formal requirement in the building or HTI industries at this time for technicians to possess the HTI+ certification. Tests cost $139 each.