For general overview about the climate and heating/cooling months have a look at solarchvision.com , but keep in mind that heating/cooling also depends on how a building is designed and made as well as its location and neighborhood.

Also, check out the following wikipedia page (section on climate of Phoenix) as well as its references.

https://en.m.wikipedia.org/wiki/Phoenix,_Arizona#Climate

Thanks Aryan Shahabian , but none of those links mention anything about cooling/heating season of Phoenix.

What I am looking for is governmental document that indicates the requirement for different location of the country (something like guideline or standard).

All Locations are BOTH hydration stations and cooling refuge locations for anyone needs to get out of the heat. Visit Phoenix.gov/Heat to get a PDF of this map. The "We're Cool" campaign offers free bottles of water and indoor locations to cool off.

@Ehsan Ahmadian Usually governmental standards declare minimum and maximum of acceptable indoor (and sometimes outdoor but in site) temperature and humidity to meet comfort and health requirements for buildings (based on type and function of the buildings). Architects and engineers are supposed to meet these criteria in their design. A carefully designed and built building incorporating passive strategies can have shorter cooling heating seasons compared with a neighboring building with careless design. The links I sent earlier are to see how the climate of Phoenix is (you could compare roughly with common humidity and thermal comfort zone) to have a clue about cooling/heating seasons there.

Also see this similar Q&A:

http://energy-models.com/forum/length-cooling-and-heating-season

Thank you Aryan Shahabian